THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL OF TANZANIA 

CERTIFICATE OF SECONDARY EDUCATION EXAMINATION

031/1 PHYSICS 1

(For Both School and Private Candidates)

Time: 3 Hours Year: 2023

Instructions

1. This paper consists of sections A, B and C with a total of eleven (11) questions.
2. Answer all questions in sections A and B and two (2) questions from section C.
3. Communication devices and any unauthorized materials are not allowed in the
   examination room.
4. Non-programmable calculators and mathematical tables may be used.
5. Write your Examination Number on every page of your answer booklet(s).
6. Where necessary the following constants may be used:

1. Acceleration due to gravity, g = 10 m/s².
2. Linear expansivity of aluminium = 0.00003 per ^°C.
3. Linear expansivity of steel = 0.00001 per ^°C.
4. Pie, π = 3.14.

SECTION A (16 Marks)

Answer all questions in this section.

1. For each of the items (i) - (x), choose the correct answer from among the given alternatives and write its letter beside the item number in the answer booklet provided, (10 marks)

(i)  A study that deals with constellation, solar system and cosmos is referred to as 

1. Electromagnetism 
2. Structure and properties of matter
3. Light 
4. Astronomy
5. Geophysics

(ii) Which of the following burning medium requires a carbon dioxide extinguisher?

1. Organic solids 
2. Flammable liquids and greases
3. Flammable gases 
4. Combustible metals
5. Electrical hazards

(iii) The initial volume of a liquid in a burette was 57 cm³. If X cm³ of the liquid was poured out of the burette and the final volume of the liquid remaining was 23 cm³, calculate the value of X.

1. 80 cm³ 
2. 50 cm³ 
3. 34 cm³ 
4. 46 cm³ 
5. -46 cm³

(iv) Classify the force experienced when a metal solid or a hard object is twisted.

1. Compression 
2. Stretching
3. Restoring 
4. Torsion
5. Friction

(v) Calculate the relative density of an object that weighs 3.5 N when in air and 2.8 N when fully immersed in water.

1. 0.8 
2. 6.4 
3. 5.0 
4. 0.22 
5. 3.5

(vi) Why can water striders and pond skaters walk on water without sinking? 

1. Because of the process of osmosis
2. Because of the property of capillarity
3. Because of the presence of impurities in water
4. Because of the force of surface tension
5. Because of the force of cohesion and adhesion.

(vii) Identify the statement that describes the Pascal's Principle of transmission of pressure in fluids.

1. Pressure is equally transmitted in liquid.
2. Pressure is the ratio of force to area.
3. Pressure depends on the height of the liquid column.
4. Pressure is affected by the force of gravity.
5. Pressure produces upthrust.

(viii) Suppose an engine raises 200 kg of water steadily through a height of 60 m in 20 sec. The upward force used is equal to the weight of water raised. Calculate the power in kW.

1. 6 kW 
2. 3 kW 
3. 5 kW 
4. 7 kW 
5. 4 kW

(ix) The following statements about magnetic lines of force are correct except:

1. Always form close loops.
2. Start at north pole and end at the south pole. 
3. Cross one another.
4. Stronger where the lines are closer together.
5. Pass through all materials, both magnetic and non-magnetic.

(x) What is the distance and displacement covered by an athlete who runs 100 m to the North, 70 m to the East, 100 m to the South and 70 m to the West to complete the race?

1. Distance is 0 m and displacement is 340 m
2. Distance is 340 m and displacement is 0 m
3. Distance is 340 m and displacement is 340 m
4. Distance is 0 m and displacement is 0 m
5. Distance is 700 m and displacement is 700m

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL OF TANZANIA

CERTIFICATE OF SECONDARY EDUCATION EXAMINATION

031/1 PHYSICS 1

(For Both School and Private Candidates)

Time: 3 Hours Year: 2022

Instructions

l . This paper consists of sections A, B and C with a total of eleven (11) questions.

2. Answer all questions in sections A and B and two (2) questions from section C.

3. Section A carries fifteen (15) marks, section B sixty (60) marks and section C carries twenty five (25) marks.

4. Cellular phones and any unauthorized materials are not allowed in the examination room.

5. Non-programmable calculators and mathematical tables may be

6. Write your Examination Number on every page of your answer booklet(s).

7. Where necessary the following constants may be used:

1. Acceleration due to gravity, g = 10 m/s². 
2. Density of water = 1.0 g/cm³ 
3. Pie,π = 3.14.
4. Speed of sound is 340 m/s.

SECTION A (15 Marks)

Answer all questions in this section•

1. For each of the items (i) - (x), choose the correct answer from among the given alternatives and write its letter beside the item number in the answer booklet provided. (10 marks)

(i) Which set best represents fundamental quantities with their SI units?

1. Length (km), mass (kg), time (s), temperature (⁰ C), amount of substance (mol) and electric current (A).
2. Length (m), mass (kg), force (N), temperature (K), time (s), amount of substance (mol) and energy (J).
3. Length (m), mass (kg), time (s), electric current (I), temperature (⁰ C) and amount of substance (mol).
4. Length (m), mass (kg), time (s), temperature (K), electric current (A) and luminous intensity (Cd).
5. Length (km), mass (g), time (s), temperature (K), electric current (A) and amount of substance (mol).

(ii) Which one of the following conditions must be satisfied for a body to float?

1. Apparent weight is equal to the difference between real weight of the body and its upthrust.
2. Upthrust equals to the weight of the fluid displaced.
3. Real weight of the body equals to its upthrust.
4. Apparent weight is equal to the product of real weight of a body and its upthrust.
5. Density of a body is equal to the density of surrounding fluid.

(iii) Which statement about the properties of gaseous state of matter is true?

1. Particles vibrate in fixed positions.
2. The shape is indefinite with definite volume.
3. Particles are closely packed together.
4. Both shape and volume are definite. 
5. The inter-particle distance is large.

(iv) At which position will the object be placed for a concave mirror to form virtual, magnified and erect image behind the mirror?

1. Between the principle focus (F) and the pole (P) in front of the mirror.
2. Between the principle focus (F) and the pole (P) behind the mirror.
3. Between the centre of curvature (C) and principle focus (F) in front Of the mirror.
4. Between the centre of curvature (C) and principle focus (F) behind the mirror.
5. Between the centre of curvature (C) and the pole (P) in front of the mirror.

(v) Which of the following uniform motion graphs represents velocity?

A
B
C
D
E

(vi) Two objects X and Y were supplied by equal quantities of thermal energy. It was observed that the temperature increase of object X is greater than the temperature increase of object Y. Which of the following statements explains the observation?

1. X has a lower melting point than Y.
2. X has a lower density than Y.
3. X has a lower thermal capacity than Y. 
4. X is a better thermal conductor than Y. 
5. X is heavier than Y.

(vii) A hot water in a cup undergoes evaporation in an open air. What happens to the mass and weight of the water in the cup?

1. Both mass and weight decrease
2. Mass decreases while weight stays the same
3. Both mass and weight stay the same
4. Mass increases while weight decreases
5. Mass stays the same while weight decreases

(viii) A student wishes to check the upper fixed point and the lower fixed point on Celsius scale thermometer as shown in Figure 1 .

Figure 1

The student has four beakers namely P, Q, R and S.

P contains a mixture of ice and salt;

Q contains a mixture of ice and water; •

R contains a mixture of boiling salt solution; and 

S contains boiling water.

Which beakers should a student use to check the fixed points?

1. P and R 
2. P and S 
3. Q and S
4. Q and R 
5. S and R

(ix) Which one of the following is not a property of cathode rays?

1. They are a stream of fast moving protons.
2. They travel in straight lines.
3. They are deflected by electric fields.
4. They are deflected by magnetic fields.
5. They produce x-rays when stopped suddenly.

(x) What does the term milky way mean?

1. A vast collection of asteroids.
2. One of the galaxies of the universe.
3. A group of stars that form a pattern in the sky.
4. One of the meteoroids.
5. One of the solar systems.

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL OF TANZANIA

CERTIFICATE OF SECONDARY EDUCATION EXAMINATION

031/1 PHYSICS 1

(For Both School and Private Candidates)

Time: 3 Hours Year: 2021

Instructions

l . This paper consists of sections A, B and C with a total of eleven (11) questions.

2. Answer all questions in sections A and B and two (2) questions from section C.

3. Section A carries fifteen (15) marks, section B sixty (60) marks and section C carries twenty five (25) marks.

4. Cellular phones and any unauthorized materials are not allowed in the examination room.

5. Non-programmable calculators and mathematical tables may be used.

6. Write your Examination Number on every page of your answer booklet(s).

7. Where necessary the following constants may be used:

(i) Acceleration due to gravity, g = 10 m/s^-2

(ii) Density of water, p = 1000 kg/m³ 

(iii) Pie, 3.14.

(iv) Linear expansitivity of steel =  1.1 x 10^-5K^-1

SECTION A (15 Marks)

Answer all questions in this section.

1. For each of the items (i) - (x), choose the correct answer from among the given alternatives and write its letter beside the item number in the answer booklet provided. (10 marks)

(i) How can the density of a stone with mass X when in air and volume Y when fully immersed in water be found?

1. By dividing the reduced mass of the stone to the volume of the water displaced.
2. By dividing the mass of the stone in the air to the volume of the water displaced.
3. By dividing the apparent mass of the stone in the water to the volume of the water displaced.
4. By dividing the mass of the stone in air to the upthrust.
5. By dividing the apparent mass of the stone to the upthrust.

(ii) Which property of concave mirrors is suitable for a dentist to consider when selecting concave mirrors for repairing dental related activities?

1. The one that produce diminished images.
2. The one with wider field of view.
3. The one which produce virtual and erect image.
4. The one that produce larger magnification.
5. The one in which objects and images are seen easily.

(iii) Which one of the following is not a property of magnetic lines of force?

1. Are continuous and always form closed loops.
2. Start at the north pole and end at the south pole.
3. Never cross one another.
4. Enter or leave a magnetic material at right angles to the surface.
5. Pass through magnetic materials only.

(iv) Which velocity-time graph represents the ball thrown vertically upwards and returning ground?

(v) Which statement describes the difference between maximum thermometer and minimum thermometer?

1. Maximum thermometer uses mercury while minimum thermometer uses alcohol.
2. Maximum thermometer measures the temperature of the solid object while minimum thermometer measures the temperature of the liquid.
3. Maximum thermometer measures the temperature in Kelvin while minimum thermometer measures the temperature in degree centigrade.
4. Maximum thermometer has concave meniscus while minimum thermometer has convex meniscus.
5. Maximum thermometer has index below the meniscus while minimum thermometer has index above the meniscus.

(vi) Choose the properties which correctly describe the hydroelectric energy from the following properties.

(1) Energy is virtual available

(2) Not reliable

(3) Environmental friendly

(4) Turn turbine to drive generators

1. (2), (3) and (4) 
2. (1), (2) and (4) 
3. (1), (3) and (4) 
4. (2), (3) and (4)
5. (1) , (2) and (3)

(vii) Why do people prefer white shawl to wrap around a baby to keep the baby warm?

1. White shawl is a poor conductor.
2. White shawl indicates cleanliness.
3. White shawl is the poor radiator.
4. White shawl has pockets of air trapped in it. 
5. White shawl is a good reflector of heat.

(viii) Which statement about a wet-and-dry bulb hygrometer is correct?

1. Wet bulb thermometers measure the temperature of the surrounding air.
2. The temperature recorded by a wet-bulb thermometer is always larger than that recorded by a dry-bulb thermometer.
3. When the difference in temperature recorded by wet and dry-bulbs is larger no water evaporates.
4. The value of relative humidity is low when the temperature of wet and dry bulbs is the same.
5. Wet-bulb is cooled by the process of evaporation of water.

(ix) The following diagram shows a cathode ray oscilloscope. Which conditional change on the oscilloscope can lead into producing a brighter trace on the screen?

1. Using time-base and connect alternating voltage to Y-plates
2. Increasing the anode voltage
3. Switching off time-base and connect battery to Y-plates
4. Switching off time-base and connect alternating voltage to Y-plates 
5. Using time base only

(x) Which statement distinguishes gravity from gravitational force?

1. Gravity is the force that pulls objects towards the earth while gravitational force is the attractive force existing between any two objects.
2. Gravity is the force of attraction between two objects while gravitational force is the force acting to pull objects toward the earth.
3. Gravity is sometimes called universal gravitation while gravitational force is also called centripental force.
4. Gravity is applicable from the largest stars to the smallest atoms while gravitational force does not.
5. E Gravity holds planets to revolve around the sun while gravitational force does not hold planets.

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL OF TANZANIA

CERTIFICATE OF SECONDARY EDUCATION EXAMINATION

031/1 PHYSICS 1

(For Both School and Private Candidates)

Time: 3 Hours Year: 2020

Instructions

l . This paper consists of sections A, B and C with a total of eleven (11) questions.

2.Answer all questions in sections A and B and two (2) questions from section C.

3.Section A carries fifteen (15) marks, section B sixty (60) marks and section C carries twenty five (25) marks.

4.Cellular phones and any unauthorised materials are not allowed in the examination room.

5.Non-Programmable calculators may be used.

6.Write your Examination Number on every page of your answer booklet(s).

7.Where necessary the following constants may be used:

(i) Acceleration due to gravity, g = 10 m/s². 

(ii) Density of water = 1.0 g/cm³ 

(iii) Pie= 3.14.

(iv) Speed of light waves = 3.0 x 10⁸ m/s

A (15 Marks)

Answer all questions in this section.

1. For each of the items (i) - (x), choose the correct answer from among the given alternatives and write its letter beside the item number in the answer booklet provided. (10 marks)

(i)Which pair of instruments is used for measuring lengths?

1. A ruler and a measuring cylinder
2. A micrometer screw gauge and a beam balance 
3. A vernier caliper and a micrometer screw gauge
4. A pipette and a vernier caliper
5. A beam balance and a spring balance

(ii)What are the two factors that determine Buoyancy? 

1. Volume of fluid displaced and mass of the object.
2. Weight and mass of the object.
3. Density of the fluid and weight of the object.
4. Volume of the fluid displaced and density of the fluid. 
5. Mass of the object and density of the object.

(iii)Which physical phenomenon is observed when a tea bag is dipped into a cup of hot water?

1. Steaming 
2. Diffusion
3. Osmosis
4. Evaporation 
5. Boiling

(iv)In a light experiment, the results showed that less light was transmitted and the image was distorted. Which type of material was used?

1. A translucent material
2. An opaque material
3. A luminous material 
4. A transparent material
5. A non-luminous material

(v) A stone dropped from the top of a building hit the ground 4 seconds later. What was its velocity when hitting the ground?

1. 400 m/s 
2. 45 m/s 
3. 40 m/s
4. 4.5 m/s 
5. 0.4 m/s

(vi)Why is Mercury preferred in clinical thermometers as a thermometric of a liquid to water and alcohol?

1. It is denser than other liquids.
2. It is opaque and does not need colouring.
3. It is more sensitive to temperature.
4. It is active and does not wet the glass. 
5. It is a poor conductor of heat.

(vii)A rectangular box of mass 10 kg rests on an inclined plane. If the coefficients of static and dynamic frictions are 0.55 and 0.25 respectively, at what angle will the box begin to slide?

1. 14.8⁰  
2. 24.8⁰ 
3. 28.8⁰
4. 38.8⁰
5. 48.8⁰

(viii)Heat would be lost in the thermos flask if the walls of the glass container were not coated with silver. Which process contributes to the heat loss?

1. Radiation 
2. Conduction 
3. Convection 
4. Absorption 
5. Transmission

(ix)A launderer was thinking about a proper day for washing and drying clothes. Which day would he prefer most among the following?

1. Dry day 
2. Hot day 
3. Windy day
4. Still day 
5. Cold day

(x)Which process is involved in producing reverberation?

1. Refraction
2. Multiple reflection 
3. Interference 
4. Diffraction
5. Reflection

 THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL OF TANZANIA CERTIFICATE OF SECONDARY EDUCATION EXAMINATION

031/1                 PHYSICS 1

(For Both School and Private Candidates)

Time: 3 Hours    Friday, 08^th November 2019 a.m.

Instructions

1. This paper consists of sections A, B and C with a total of eleven (11) questions.
2.  Answer all questions in sections A and B and two (2) questions from section C.
3.  Cellular phones and any unauthorised materials are not allowed in the examination room.
4.  Non-programmable calculators may be used.
5.  Write your Examination Number on every page of your answer booklet(s).
6. Where necessary the following constants may be used:

1.  Acceleration due to gravity, g = 10 m/s ²
2. Density of water = I .0 g/cm ³ 
3. Pie= 3.14.
4.  Coefficient of linear expansivity of the brick 1.2 x 10 ^-5 K ^-1
5.  Speed of light in air = 3 x 10⁸ m/s. 
6. Speed of sound in air = 340 m/s.

SECTION A (15 Marks)

Answer all questions in this section.

1. For each of the items (i) - (x), choose the correct answer from among the given alternatives and write its letter beside the item number in the answer booklet provided.

(i) Which pairs of instruments would you use to correctly measure the diameter of a small ball bearing?

1.  Measuring tape and vernier caliper
2.  Slide rule and micrometer screw gauge
3.  Vernier caliper and slide rule
4.  Micrometer screw gauge and vernier caliper
5. Metre rule and micrometer screw gauge

(ii) A piece of a cork of volume 100 cm ³ is floating on the surface of water. If the density of the cork is 0.25 g cm ^-3 , what volume of the cork is immersed in the water?

1. 100 cm ^-3
2. 0.25 cm ³
3. 25 cm ³
4. 100.25 cm ³
5. 0.025 cm ³

(iii) A layer of colorless water floating on a blue copper (Il) sulphate solution becomes blue after sometime. Which physical process supports the observation made?

1. Diffusion       
2. Cohesive  
3. Surface tension
4. Adhesive  
5. Osmosis

(iv) A pin-hole camera 200 mm long produces an image of 2 mm diameter of the sun. If the sun's distance from the earth is about km , what is the diameter of the sun?

1. 1.5 x 10 ⁸ km
   
2. 1.5 x 10 ⁶ km
   
3. 3 x 10 ⁵ km
   
4. 7.5 x 10 ⁴ km
   
5. 3.0 x 10 ³ km

(v) Which phenomena is a result of the earth being exactly along the same line between the centre of the sun and the moon?

1. Lunar eclipse
2. Penumbra
3. Solar eclipse
4. Umbra
5. Reflection

(vi) Which metals become strongly magnetized when subjected to a magnetic field?

1. Nickel and copper
2. Zinc and aluminium
3. Cobalt and iron
4. Aluminium and lead
5. Iron and zinc

(vii) A body moved upward a distance of 20 m. Calculate the time taken to reach the maximum height.

1. 2 s
2. 5 s
3. 10 s   
4. 15 s   
5. 11 s

(viii) The temperature of a certain liquid is measured to be 300 K. What will be its temperature in degree centigrade?

1. 273⁰ c   
2. 100⁰ c   
3.  57 ⁰ C
4. 37⁰ C
5. 27⁰ C

(ix)Which factors influence friction between tyres of a car moving with constant speed and the surface of the road?

1.  Weight and speed
2. Speed and nature of the surface
3. Nature of the surface and weight
4. Surface area of the tires and speed
5. Acceleration and nature of the surface

(x) When the sun shines on the dark-coloured driving wheel of a car, the wheel feels warm. Why?

1.  It is because the sun warms the car by induction.
2.  It is because the sun gives energy to the wheel by convection.
3.  It is because the sun radiates thermal energy to the wheel.
4.  It is because the sun radiates heat to the glass windows.
5. It is because the sun conducts thermal •energy to the wheel.

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL

CERTIFICATE OF SECONDARY EDUCATION EXAMINATION 

031/1          PHYSICS 1

(For Both School and Private Candidates) 

Time: 3 Hours                   Friday, 09^th November 2018 a.m. 

Instructions 

1. This paper consists of sections A, B and C with a total of eleven (11)  questions.
2. Answer all questions in sections A and B and one (1) question from section C.
3. Calculators, cellular phones and any unauthorized materials are not allowed in the examination room.
4. Write your Examination Number on every page of your answer booklet(s).
5. Where necessary the following constants may be used:

(i)Acceleration due to gravity, g = 10 m/s² or 10 N/kg

(ii)Specific heat capacity of mercury is 1395 J/kg°C

(iii) 1g of water is equivalent to 1 cm³ 

(iv)    Pi = 3.14.            

SECTION A (30 Marks)

Answer all questions in this section.

1. For each of the items (i) - (x), choose the correct answer among the given alternatives and write its letter besides the item number in the answer booklet provided.

(i)The correct formula to find the elastic force constant (k) of a spring is

1. Tension/extension
2. mass/extension
3. extension/mass
4. extension/tension
5. tension/mass

(ii) Why is oil used as a lubricant?

1. It has low density.
2. It is highly viscous.
3. It is flammable.
4. it is inflammable    
5. It is less viscous.

(iii)Which one is a characteristic of a plane mirror?

1. It forms image which is real and opaque.
2. It forms an image which is larger than the object.
3. It forms an image which is real and laterally inverted
4. It forms an image which has the same size as the object.
5. It forms an image which is smaller in size than the object.

(iv) Which one is not a region of electromagnetic spectrum?

1. radio waves
2. . x-rays
3. infrared light
4. ultraviolet light 
5. invisible light waves.

(v)  What quantity of heat is required to raise the temperature of 25 kg sample of mercury from 20°C to 30°C?

1. 1,743,750J
2. 348,750J
3. 345,750J
4. 413,750J
5. 1,550,750J

(vi)When silicon element is doped with phosphorus atoms, it produces

1.   a p-type semiconductor
2. force
3. an intrinsic semiconductor
4. a bipolar semiconductor
5. an n-type semiconductor

(vii) Which of the following is an example of a scalar quantity?

1. Electric current 
2. Force
3. Velocity
4. Displacement
5. Acceleration

(viii)What role does the iris play in the human eye?

1. To hold the lens in position.
2. To prevent internal reflection.
3. To control the size of the pupil.
4. To control the thickness of the lens.
5. To protect the eye from light.

(ix) Asteroids which manage to reach the earth surface are called

1. stars.
2. meteors
3. meteorites.
4. constellations.
5. comets.

(x) What will be the resistivity of a wire 2 metres long with a cross-sectional area of 0.50 mm² and a resistance of 2.20? 

1.  5.5 x 10^-7 ?m 
2.  6.5 xlO^-7?m 
3. 2.3 x 10^-7 ?m 
4.  1.1 x 10-⁶?m
5.  5.5 x 10^-6?m.

A gas of volume 900 cm³ at 27⁰ C when warmed at constant pressure to 87^oc will occupy a new volume of

1.  900cm³   
2. 720 cm³ 
3. 1080cm3
4.  540cm³   
5. 727cm³

Which of the following scientific statements needs to be proved through scientific research?

1.  Hypothesis 
2.  Principle 
3. Proposal
4. Conclusion  
5. Measurement

(iii)    What will be the acceleration of the car while its speed was increasing as shown in Figure 1?

1. 0.8m/s²
   
2. 0.4m/s²
3. 2.5m/s²
4. 1.125m/s²
5. 3.125m/s²

(iv)      Which of the following electromagnetic waves have largest wavelength

1. Ultraviolet 
2. Infrared 
3.  Gamma rays
4.  Radio wave
5. X-rays

(v)       The device which operates under the principle oftotal internal reflection of light is called:

1.  magnifying lens
2.  plan mirror
3. telescope
4.  optical fibre
5.  pin-hole camera

(vi)      If 120 volts are used to light a 30-wattlight bulb, what will be the current flowing through that bulb?

1.   40A    
2.  30A  
3. 0.25A
4. 4A
5. 0.30A

(vii) When a lead - .acid accumulator is freshly made it has an electromotive force (e.m.f) of

1. 1.5A
2. 1.25
3. 2V
4. 3V
5. 1V

(viii)Which among the following radiations can be absorbed by a metal plate?

1.  Alpha (a) particle 
2.  Gamma (y) rays
3.  Beta (ß) particle
4.  X-rays  
5.  Cathode rays

(ix)Where are asteroids found in the solar system?

1.   Between Mercury and Venus
2.  Between Earth and Mars
3. Between Mars and Jupiter
4. Between Saturn and Uranus 
5. Between Neptune and Pluto

(x)    What fraction of the atoms would have been disintegrated in 72 hours when the half-life of an element is 24 hours?

1. 1/8
   
2. 1/2
3. 3/4
4. 7/8
5. 1/4

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL OF TANZANIA

CERTIFICATE OF SECONDARY EDUCATION EXAMINATION

031/1PHYSICS 1

Time: 3Hours November, 2016

Instructions:

1. This paper consists of section A, B and C.
2. Answer all the questions in section A and B and one question from section C
3. Cellular phones and any unauthorized materials are not allowed in the examination room.
4. Write your Examination Number on every page of your answer booklet(s)
5. Where necessary the following constants may be used:

1. Acceleration due to gravity, g = 10m/s^2.
2. Density of water = 1.0g/cm^3.
3. Pie, = 3.14.
4. Coefficient of linear expansivity of the brick = 1.2 x 10^-5 K^-1.
5. Speed of light in air = 3 x 10⁸m/s.
6. Speed of sound in air = 340 m/s

SECTION A:

Answer all questions in this section

1. For each of the items (i) – (x), choose the correct answer among the given alternatives and write its letter beside the item number in the answer booklet provided

(i) The position of the centre of gravity of an object has a significant influence in its

1. Elasticity
2. Plasticity
3. Stability
4. Rigidity
5. Elastic limit.

(ii) Which statement explains the basis of heliocentric theory?

1. The earth was known to revolve around the sun
2. The earth was stationary
3. The sun was known to revolve around the earth
4. The sun was stationary
5. The earth was known to revolve around its axis.

(iii) Which among the following is a reason for the sky to appear blue while being observed from the earth?

1. Regular reflection of sunlight
2. Irregular refraction of sunlight
3. Diffuse refraction of sunlight
4. Selective scattering of sunlight
5. Regular diffraction of sunlight.

(iv) The suspended magnetic needle always comes to rest with its axis in a vertical plane called?

1. Geographic meridian
2. Magnetic meridian
3. Geographic declination
4. Magnetic declination
5. Geographic North Pole.

(v) The correct arrangement of metals in ascending order of their linear expansivities is?

1. Iron, Copper, Invar, Brass and Nickel
2. Nickel, Brass, Invar, Copper and Iron
3. Brass, Copper, Nickel, Iron and Invar
4. Invar, Iron, Nickel, Copper and Brass.
5. Nickel, Brass, Iron, Invar and Copper.

(vi) The loudness of a note produced by a vibrating object depends on?

1. The number of vibrations per second
2. The overtones present
3. The quality of sound
4. The wavelength between two nodes
5. The amplitude of vibration.

(vii) How many number of images will be formed if the angle between two mirrors is 0 ?

1. 2
2. 3
3. 4
4. 5
5. Infinite

(viii) The correct statement about radio waves is that:-

1. They have shortest wavelength
2. They can be produced by comets in space
3. They don’t undergo reflection
4. They require medium on its transmission
5. They have smallest frequency

(ix) What is the function of cathode in x – ray tube?

1. To control heat produced n the target
2. To accelerate the speed of electrons
3. To conduct heat away from the target.
4. To control brightness on the screen.
5. To focus electrons on the target.

(x) Which of the following circuit elements has ability to produce gain as used in electronics?

1. Inductor
2. Diode
3. Resistor
4. Capacitor
5. Amplifier.

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL CERTIFICATE OF SECONDARY EDUCATION EXAMINATION

031/1 PHYSICS 1

(For Both School and Private Candidates)

Time:3 Hours Monday, 09^th November 2015 a.m.

Instructions

1.  This paper consists of sections A, B, and C.

2.  Answer all questions in sections A and B and one (1) question from section C.

3.  Calculators and cellular phones are not allowed in the examination room.

4.  Write your Examination Number on every page of your answer booklet(s).

5.  Where necessary the following constants may be used:

(i)  Acceleration due to gravity, g = 10 m/s²

(ii)  Density of water = 1.0 g/cm³

(iii)  Linear expansivity of iron = 1.24×10^­5­1K

(iv)  Specific latent heat of fusion of ice = 336 J/g

(v)  Velocity of sound in air = 340 m/s

(vi)  Pi, =3.14

SECTION A (30 Marks)

Answer all questions in this section.

1. For each of the items (i)­(x), choose the correct answer among the given alternatives and write its letter beside the item number in the answer booklet provided.

(i) A spiral spring of natural length 1.50m is extended to 1.505m by a force of 0.80N What will be its extension when the applied force is 3.20N?

1.  0.005m 
2.  6.020m 
3.  0.020m
4.  4.520m 
5.  1.57.

(ii) Which of the following electromagnetic waves is used to detect flaws and defects in steel plates?

1.  infrared waves 
2.  ultraviolet waves 
3.  x­-rays
4.  gamma rays 
5.  micro waves.

(iii) A part of human eye that corresponds to the film in a camera is called

1.  cornea 
2.  iris 
3.  lens
4.  pupil 
5.  retina.

(iv) The sun generates its energy by a process called

1.  thermonuclear fission 
2.  thermonuclear fusion
3.  geothermal energy 
4.  geothermal fusion
5.  geothermal fission.

(v) What will be the size of the image formed if an object 4cm tall is placed 20cm in front

 of a concave mirror of focal length 15cm?

1.  60cm 
2.  40cm 
3.  24cm
4.  12cm 
5.  3cm.

(vi) What is the main function of step up transformer?

1.  To change a.c to d.c current 
2.  To decrease resistance in a circuit
3.  To increase a.c voltage 
4.  To decrease a.c voltage
5.  To increase a.c current.

(vii) The most probable radiation forming a well­defined track when passed in a cloud chamber is called

1.  gamma­rays 
2.  beta rays 
3.  cathode rays
4.  alpha rays 
5. E x­-rays.

(viii) The effect of adding an acceptor impurity to a silicon produce a crystal called

1.  P­type 
2.  N­type 
3.  PN­type
4.  NP­type 
5.  PNP­type.

(ix) Colours are produced when white light passes through glass prism because

1.  light waves interfere
2.  glass prism colours the light
3.  in glass different colours travel at different speeds
4.  different colours are filtered
5.  diffraction of light occurs.

(x) Which of the following statements is true when the resistance, R, of a wire is measured using an ammeter, voltmeter and rheostat?

1.  the ammeter is in parallel with R
2.  the voltmeter is in series with R
3.  a graph of V against I has a gradient equal to R
4.  a graph of I against V has a gradient equal to R
5. the rheostat is in parallel with R.

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL 

CERTIFICATE OF SECONDARY EDUCATION EXAMINATION

031/1 PHYSICS 1 (For Both School and Private Candidates) 

  Time:3 Hours Monday, 10th November 2014 a.m. 

Instructions 

1.  This paper consists of sections A, B, and C.
2.  Answer all questions in sections A and B and one (1) question from section C.
3.  Calculators and cellular phones are not allowed in the examination room.
4.  Write your Examination Number on every page of your answer booklet(s).
5.  Where necessary the following constants may be used: 

(i) Acceleration due to gravity, g = 10 m/s2 or 10 N/kg

(ii) Electronic charge, e = -1.602x10-19 C

(iii) Refractive index of water = 4/3

(iv) Pi, π = 3.14  

SECTION A (30 Marks)

Answer all questions in this section.

1. For each of the items (i)-(x), choose the correct answer among the given alternatives and write its letter beside the item number in the answer booklet provided.

(i) What physical phenomenon is observed when a tea bag is dipped into a cup containing hot water?

1.  Surface tension
2.  Capillary then diffusion
3.  Diffusion
4.  Osmosis then diffusion 
5.  Osmosis only. 

(ii) When a gas is compressed at constant temperature, the gas molecules

1.  move faster than air outside and the pressure is increased
2.  move with uniform speed and the pressure is unchanged
3.  gain more kinetic energy and the pressure is decreased
4.  increase slightly in size and its pressure remains constant
5. make more impacts per second on the walls of the container.

(iii) A car moving at steady speed has a frictional force on its surface whose size depends on its

1.  speed and surface area
2.  speed
3.  surface area
4.  weight 
5.  wheels speed. 

(iv) When illuminated by a certain lamp, the shadow of a table-tennis ball on a white screen is uniformly dark. This is because the lamp used is

1.  very bright
2.  fluorescent
3.  very small 
4. very weak
5. very large. 

(v) In a black and white television, the image is formed on the screen by:

1. varying the intensity or brightness of the electron beam
2.  adjusting the number of stations using a remote control
3.  limiting the flow of electrons between the cathode and anode
4.  increasing the grid’s voltage to its maximum value
5.  adjusting the antenna to capture waves of short wavelength. 

(vi) A green card with red flowers when viewed in a red light will appear:

1.  completely red
2.  completely yellow
3.  completely green 
4.  yellow with red flowers 
5.  green with red flowers. 

(vii) Figure 1 shows a pattern of waves in a ripple tank traveling from part X to part Y across a plane section Z.

Figure 1

What observation can be made from Figure 1?

1.  the total reflection occurs at Z
2.  the wavelength in part X is greater than that in part Y
3.  the wave speed v1 in part X is less than v2 in part Y
4.  diffraction occurs across Z
5.  The wave changes in frequency as it crosses Z. 

(viii) A solid metal cube has each side doubled to make a solid cube of the same metal eight times bigger in volume. The ration of resistivity of the new cube to resistivity of the old cube is

1.  8:1
2.  6:1
3.  1:1
4.  1:6
5.  1:8 

(ix) In a cloud chamber, straight-line trails of vapour are produced by a source emitting:

1. beta-particles
2. gamma-rays
3. electrons
4.  alpha-particles 
5. light rays. 

(x) Which of the following is the correct weight of a body of mass 48 g when placed on the moon surface?

1.  0.48 N 
2.  4.8 N
3.  0.80 N
4.  0.048 N
5.  80.0 N. 

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL

CERTIFICATE OF SECONDARY EDUCATION EXAMINATION

031/1 PHYSICS1

(For Both School and Private Candidates)

Time:3Hours Monday, 11^th November 2013a.m.

Instructions

1. This paper consists of sections A, B and C.

2. Answer all questions in sections A and B and one (1) question from section C.

3. Calculators and cellular phones are not allowed in the examination room.

4. Write your Examination Number on every page of your answer booklet(s).

5. Where necessary the following constants may be used:

   1. Acceleration due to gravity, g = 10 N/kg or 10 m/s²

   2. Density of air = 1.2 kg/m³

   3. Density of mercury = 13200 kg/m³

   4. Density of water = 1000 kg/m³

   5. Linear expansivity of steel = 11 x 10^-6 K^-1

   6. Pi, π = 3.14

SECTION A (30 Marks)

Answer all questions in this section.

1. For each of the items (i) - (x), choose the correct answer among the given alternatives and write its letter beside the item number.

(i) Tow forces of 5 N and 8 N are acting at the same point and are inclined at an angle of 45° to each other. What will be their resultant force?

1. 11.2 N
2. 12 N
3. 22.4
4. 1.2 N
5. 1.12 N

(ii) Which of the following are good examples of ferromagnetic materials?

1. iron and ceramic
2. zinc and iron
3. copper and nickel
4. nickel and cobalt
5. obalt and ceramic

(iii) A white shawl wrapped around a baby keeps the baby warm because the shawl

1. is a poor reflector
2. is a poor radiator
3. has pockets of air trapped in
4. conducts heat to the baby
5. stops convection currents.

(iv) A body is said to be in equilibrium IF

1. it moves with uniform speed
2. the net force acting on it is zero
3. the upward and downward forces are equal
4. its centre of gravity is low positioned
5. its centre of gravity is high.

(v) The correct statements about sound waves is that they

1. are transverse waves
2. can travel in vacuum
3. can be polarized
4. cannot be polarized
5. do not require medium.

(vi) In order to produce electrons in a discharge tube the

1. anode should be at a higher potential than the cathode
2. potential difference at the anode should be low
3. cathode should be heated indirectly at low voltage supply
4. electrodes should be at the same potential
5. electrons must be accelerated at higher potential.

(vii) The battery in the circuit shown in the following diagram has an e.m.f. of 2 V and negligible internal resistance.

What will be the current flowing in the 6 ? resistor?

1.  0.15 A
2. 0.64 A
3. 1.42 A
4. 0.10 A
5. 0.33 A

(viii) The image formed by plane mirrors are always

1. real, magnified and laterally inverted
2. virtual, laterally inverted and same in size
3. magnified, virtual and erect
4. laterally inverted, same in size and real
5. erect, real and magnified.

(ix) Which of the following particles is used to cause fission in an atomic reaction?

1. proton
2. deuteron
3. neutron
4. beta-particle
5. alpha-particle

(x) The layer in the atmosphere where weather phenomena are formed is called

1. stratosphere
2. magnetosphere
3. thermosphere
4. troposphere
5. exosphere.

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL

CERTIFICATE OF SECONDARY EDUCATION EXAMINATION

031/1 PHYSICS 1

(For Both School and Private Candidates)

Time: 3 Hours Monday, 15^th October 2012 a.m.

Instructions

1.This paper consists of sections A, B and C.

2.Answer all questions in sections A and B and one (1) question from section C.

3.Calculators and cellular phones are not allowed in the examination room.

4.Write your Examination Number on every page of your answer booklet(s).

5.Where necessary the following constants may be used:

(i)Acceleration due to gravity, g = 10 m/s² or 10 N/kg

(ii)Atmospheric pressure = 0.76 mHg

(iii)Density of water = 1 g/cm³

(iv)Pi, π = 3.14

SECTION A (30 Marks)

Answer all questions in this section.

1.For each of the items (i) – (x), choose the correct answer among the given alternatives and write its letter beside the item number.

(i)One advantage of the lead-acid accumulator is that

1. Its internal resistance is high
2. Its p.d. is less than 2 V
3. It can be recharged
4. Its e.m.f. is more than 10 V 
5. It supplies only a small current.

(ii)When an object moves around a horizontal circle of centre O with a constant speed its acceleration will be:

1. zero
2. towards the centre
3. away from the centre
4. along the tangent to the circle
5. along the direction of rotation

(iii)A total eclipse of the Sun is due to

1. the Moon coming between the Earth and the Sun
2. the Earth coming between the Moon and the Sun
3. the Moon reflecting light away from the Earth
4. the Sun coming between the Earth and the Moon 
5. the Earth reflecting light away from the Moon.

(iv)Short-sightedness in a human eye is due to

1. eyeball being too short 
2. eyeball being too large
3. eye lens being too weak
4. eye lens being smaller than retina
5. eyeball being larger than retina

(v)In Figure 1, a hydraulic press P is used to raise a load of 10000 N. A force F of 25 N is applied at the end of a lever pivoted at O to just raise the load.

Figure 1

What will be the value of force X applied to the press?

1. 1500 N
2. 100 N
3. 1125 N
4. 33.33 N
5. 13.33 N

(vi)The note from a plucked guitar will have a low pitch if the string is

1. thick and long
2. thick and slack
3. thin and slack
4. thin and short 
5. thick and short.

(vii)Lenz’s law can be applied to predict the

1. magnitude of back e.m.f. in a circuit
2. magnitude of induced current in a circuit
3. direction of applied e.m.f. across the circuit 
4. direction of induced e.m.f. in a circuit 
5. direction of the applied e.m.f. within a circuit.

(viii)The half-life of a certain radioactive element is 12 hours. What fraction of an element will have disintegrated in 72 hours?

1. 1/64
2. 1/16
3. 1/32
4. 1/8
5. 1/72

(ix)The mass of an atom depends on the number of

1. protons only
2. neutrons, electrons and protons
3. electrons and protons
4. neutrons and protons
5. electrons and neutrons

(x)The interior structure of the Earth is composed of three major zones which are:

1. magma, mantle and the core
2. lava, crust and magma
3. hypocenter, crust and the mantle 
4. the core, lava and hypocenter 
5. crust, mantle and the core.

(i)  The addition of impurities to an element like silicon is aimed at:

1. making p-n junction
2. increasing the conductivity of the element 
3. stabilizing the temperature of the element
4. making the element heavier
5.   increasing the resistivity of the element

(ii)According to the usual transformer notation, which of the following equations is correct?

.

iii)When a person perspires on a hot day:

1.  evaporation occurs and helps to cool the body.
2. heat is conducted away from the body
3. latent heat keeps the body warm        
4. the body is insulated from the warm air
5. convection cools the body

(iv)  Which of the following sources of energy are non-renewable?

1. Water, wind and natural gas. 
2.  Fossils, sun, oil and nuclear.
3. Natural gas, water, nuclear and wood.
4.  Wind, sun, fossils and oil.
5. Oil and all natural gases.

(v)     Heat is supplied at equal rates to equal masses of water and aluminium The temperature of aluminium rises more quickly than that of water because the aluminium has:

1.  a lower latent heat
2.  a higher heat capacity 
3.  a higher specific heat capacity 
4.  a higher latent heat  
5.  a lower specific heat capacity

Which of the following device works on d.c only?

1. An electric bell  
2.  A step-down transformer
3. A transistor 
4. An induction coil
5. A step-up transformer

(vii)        Which statement is correct regarding alpha particles?

1. They carry a negative charge.
2. They are hardly deflected by magnetic fields.
3.  They travel a long distance in air. 
4.  They are very penetrating.  
5. They are identical with the nuclei of hydrogen atoms.

(viii)       The cost of electricity for a 2000W electric fire used for 10.30 hours at the rate of Shs. 8.00 per KWh is:

1. shs. 160    
2.  shs. 80
3. shs. 168
4. shs. 1,600 
5.  shs. 3,200

(ix)  The following is an important sign that can be observed before an earthquake occurs:

1. The average temperature keeps decreasing daily.
2. Television signals and radio stations are received at a frequencr that is below normal.
3. The entire animal kingdom becomes highly disturbed and restless 
4.  The level of water in the ocean decreases by one third.
5. Formation of backward rivers due to sudden shaking of the earth

(x)     Water spreads and wets a surface when spilled on it because the:

1.  adhesive forces between water molecules and surface molecules are large
2.  cohesive forces between water molecules and surface molecules are large
3. adhesive forces between water molecules are small
4. cohesive forces between water molecules and surface mole are small
5. cohesive forces are greater than adhesive forces.

1.For each of the items (i) - (x) choose the correct answer among the given alternatives and write its letter beside the item number.

(i) The addition of impurities to element like silicon is aimed at 

1. making p-n junction.
2. increasing the conductivity of the element. 
3. stabilizing the temperature of the element 
4. making the element heavier.
5. increasing the resistivity of the element.

(ii) According to the usual transformer notation, which of the following equations is correct?

1.  I_S / I_P = N_S / N_P 
2. I_S / I_P = V_P / V_S 
3. I_S / I_P = V_S / V_P
4. N_P / N_S = V_S / V_P 
5. V_S / I_P = N_S / N_P

(iii) When a person perspires on a hot day

1. evaporation occurs and helps to cool the body.
2. heat is conducted away from the body.
3. latent heat keeps the body warm.
4. the body is insulated from the warm air.
5. convection cools the body.

(iv) Which of the following sources of energy are non-renewable?

1. Water, wind, wood and natural gas.
2. Fossils, sun, oil and nuclear.
3. Natural gas, water, nuclear and wood.
4. Wind, sun, fossils and oil.
5. Oil and all natural gas.

(v) Heat is supplied at equal rates to equal masses of water and aluminium. The temperature of aluminium rises more quickly than that of water because the aluminium has

1.  a lower latent heat.
2.  a higher heat capacity.
3.  a higher specific heat capacity. 
4.  a higher latent heat. 
5.  a lower specific heat capacity.

(vi) Which of the following device works on d.c. only?

1. an electric bell.
2. a step-down transformer
3. a transistor
4. an induction coil
5. a step-up transformer

(vii) Which statement is correct regarding alpha particles?

1. They carry a negative charge.
2. They are hardly deflected by magnetic fields.
3. They travel a long distance in air.
4. They are very penetrating.
5. They are identical with the nuclei of hydrogen atoms.

(viii) The cost of electricity for a 2000W electric fire used for 10.30 hours at the rate of shs 8.00 per KWh is

1.  shs 160 
2.  shs 80 
3.  shs 168
4.  shs 1600 
5.  shs 3200

(ix) The following is an important sign that can be observed before an earthquake occurs:

1. The average temperature keeps decreasing daily.
2. Television signals and radio stations are received at a frequency that is below normal.
3. The entire animal kingdom becomes highly disturbed and restless.
4. The level of water in the ocean decreases by one third.
5. Formation of backward rivers due to sudden shaking of the earth.

(x) Water spreads and wets a surface when spilled on it because the

1. adhesive forces between water molecules and surface molecules are large.
2. cohesive forces between water molecules and surface molecules are large.
3. adhesive forces between water molecules are small.
4. cohesive forces between water molecules and surface molecules are small.
5.  cohesive forces are greateer than adhesive forces.

i)Which one of the following statements about alpha and beta particles is correct?

1.  They carry the same charge.
2.  Each alpha particle has four times the mass of beta particle.
3. Alpha particles have larger range in air than beta particles.
4. When in motion, they are deflected in opposite directions by a magnetic field.
5. Alpha particles cause ionization while beta particles do not.

Light waves differ from sound waves because:

1.  light is an electromagnetic wave but sound is a mechanical wave 
2.  sound waves do not travel in water but light waves do.
3.   the speed of light is independent of the medium it travels but the speed of sound depends on the medium.
4.  interference is obtained with light waves but not with so waves.
5.  the speed of sound waves is greater than that of light waves in the same medium.

(iii)     In a laboratory, the diameter of a piece of wire can accurately measured by:

1. Vernier Calliper
2. Micrometer screw gauge
3. Engineers Calliper
4. Rate meter
5. A thread wound round it once.

(iv)     A basic condition for diffraction of a wave when it passes through an opening is that:

1. the wavelength of the incident wave must be greater than the size of the opening.
2. the amplitude of the wave must be less than the size of the opening.
3. the wavelength ofthewave must be shorter than the corresponding size of the opening.
4. the wavelength of the wave must almost be equal to the size of the opening.
5. the amplitude of the wave must be greater than the opening.

(v)       The specific latent heat offusion of a substance is defined as the energy required to:

1. change a unit mass of the substance from solid to liquid.
2.  change a unit mass of a substance from solid to liquid at constant temperature.
3. change the mass of substance from solid to liquid at constant temperature.
4. cause a unit temperature rise of a substance.
5. cause a unit mass of water to freeze at O^OC.

(vi)     For an oscilloscope just to display the wave form of a.c supply which controls should be adjusted? 

1. Y-shift then X-time base
2.  X-time base then Y-shift
3.   Y-shift then brightness 
4. X-time base the T-gain
5. . Y-gain then focus.

(vii)   A regular rise and fall in loudness of a music player at a distance is called:

1. intensity
2. timbre
3. pitch
4. beats
5. resonance

(viii)Which of the following are non-magnetic metals?

1. Iron and Steel
2.  Aluminium and Zinc
3.  Nickel and Cobalt
4. Nickel and Steel 
5.  Iron and Cobalt

(ix)     The temperature of a liquid in a thermos flask remains unaltered for a long time because heat loss by:

1. conduction is minimized.
2. convection and radiation are reduced.
3. radiation and convection are minimized.
4.  conduction and radiation are reduced.
5. all modes of heat transfer are reduced.

(x)       A body is said to be in equilibrium if: 

1.  it moves with uniform speed.
2.  the net force acting on the body is zero.
3. the upward forces on the body counter-balance some of the downward forces.
4.  its centre of gravity is low positioned.
5.  its centre of gravity is high.

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL

CERTIFICATE OF SECONDARY EDUCATION EXAMINATION 031/1 

PHYSICS 1

(For Both School and Private Candidates)

TIME: 3 Hours Thursday 15^thOctober 2009 a.m.

Instructions

1.This paper consists of sections A, B and C.

2.Answer all questions in sections A and B and two (2) questions from section C.

3.Electronic calculators are not allowed in the examination room.

4.Cellular phones are not allowed in the examination room.

5.Write your Examination Number on every page of your answer booklet(s).

6.Where necessary the following ants may be used.

Acceleration due to gravity, g = 9.8ms-2

SECTION A

1. For each of the items (i) - (x), choose the correct answer from among the given alternatives and write its letter beside the item number.

(i)Relative humidity is defined as:

1. the percentage saturated vapour pressure of water at dew point.
2. the percentage of the volume of the water in air required to saturate it at the same temperature.
3. the percentage of moisture in air.
4. the percentage of the mass of water vapour actually present in a unit volume of air required to saturate it at the same temperature.
5. the percentage of the volume of water in air at S.T.P.

(ii)A rod is brought close to the cap of a charged electroscope causing the leaves of the electroscope to collapse. This indicates that: 

1. the rod and the electroscope must be oppositely charged.
2. the rod and the electroscope must have the same charge.
3. the rod must be uncharged.
4. the rod may have an opposite charge to the charge on the electroscope or may be uncharged. 
5. the rod must be charged.

(iii) A pin-hole camera gives a sharp image:

1. because the image is small
2.  if the hole is small
3.  if the hole is extremely small
4.   because the object is a long way from the hole
5.  because the screen is in a short distance from the hole

(iii) A pin-hole camera gives a sharp image:

1. because the image is small
2. if the hole is small
3. if the hole is extremely small
4. because the object is a long way from the hole
5. because the screen is in a short distance from the hole

(v) What happens when a liquid changes into gaseous state?

1. Some surface molecules absorb latent heat of vaporization and escape.
2. It gives its own latent heat that can be used to heat up the surrounding.
3. The potential and kinetic energies of the molecules increase.
4. The molecules attractive forces to one another increase and their average kinetic energy decreases.
5. There is no adhesive force between molecules.

(vi)    The electromotive force of a dry cell is derived from chemical reaction of:

1. ammonium chloride jelly
2. the powdered carbon
3.   carbon rod and zinc can
4.   manganese dioxide powder
5.  the brass cap

(vii)    What do you find when conducting an experiment of expansion of solids, liquids and gases at the same temperature change?

1.  Solids and gases expand at the same rate.
2. Solids expand more than liquids and gases.
3. Liquids expand more than gases and solids.
4.  Gases expand more than solids and liquids. 
5. All expand at the same time.

(viii)Ocean tides are caused by

1.  rotation of the earth about the sun
2. rotation of the moon about the earth
3. gravitational force of the earth on the moon 
4.  rotation of the earth about its axis
5. gravitational force of the moon on sea water.

(ix)     In electromagnetic induction:

1.  induced e.m.f is produced wherever a conductor carrying an  electric current has its magnetic flux changed.
2. speed of motion determines direction of the induced current.
3.  Lenzs law gives direction of induced e.m.f
4. induced e.m.f opposes its production methods.
5.  Faradays law gives direction of induced e.m.f

(x)The nuclear reaction   is one which can be used in power generation. In this case the values of x and y are:

1. α and 4n
2. n and 2n
3. γ and n 
4.  ß and n 
5. e and n

When a bus starts or stops moving, passengers tend to be jerked forward or backward. This is due to:

1.   Newtons 1^st law of motion
2. Newtons 2^nd law of motion
3.  Newtons 3^rd law of motion
4. Newtons law of universal gravitation 
5.  Momentum of the bus

(ii)        Racing cars rarely get accidents despite their high speed because they:

1. have greater momentum
2. have big tyres with big treads
3. have wide bases and low centre of gravity
4. exert greater frictional force
5. have less mass

(iii)      An air ship is floating high above the ground. In this case the air

1.  density outside the airship is less than the air density inside.
2.  density outside the airship is greater than the air density inside.
3.  upthrust is equal to the airship weight.
4. upthrust is greater than the airship weight.
5.  temperature inside the airship is equal to the air temperature outside.

(iv)      The positions of particular constellations in the sky have helped huæm beings in ..

1. locating positions of various galaxies.
2.  telling time and planning the course of peoples activite accordingly.
3.  the discovery of certain minor planets.
4. the discovery of force of gravity which holds the planets together.
5. the discovery of why things fall down whenever thrown up up

(v)        Total internal reflection has a wide use in our daily life such as in:

1. medicine, engineering, industries and communications
2. the study of the universe
3. locating positions of fish in lakes and oceans
4. the study of fluid flow and leakage in pipes
5.  finding why substances appear apparently raised when viewed from above the surface of water.

(vi)      When using a measuring cylinder, one precaution to take is to .......„

1. check for zero error
2. look at the meniscus from below the level of the water
3. obtain more readings by looking from more than one direction
4. position the eye in the line with the base of the meniscus
5. make sure that the measuring cylinder is clean

(vii)     What holds the planets in their orbits and makes them to move(revolve) around the sun?

1.  Force of attraction between the sun and the planets.
2. Force of attraction between the planets. 
3. Force of gravity that attracts all bodies.
4. Force of attraction between the sun and the earth.
5.  Force of attraction between the earth and planets. 

(viii)Two coils X and Y having the same dimensions and number of turns wound around a piece of soft iron have a steady current passing through them as shown in the Figure below.

1. End P becomes North Pole, while end Q becomes a South Pole.
2. End P becomes a South Pole, while end Q becomes a North Pole.
3. Both ends P and Q become North Poles.
4. Both ends P and Q become South Poles.
5. Neither end P nor end Q becomes poles since the effects of the two cancel out.

(ix) In a race competition, one should kneel down when starting the race so that:

1. no one can fall down by reaction produced by the earth to them. 
2.  each one can receive an acceleration which the earth provides.
3.  one of the rules in sports is not violated by anyone.
4. equal and opposite forces can act on a body to produce a resultant force.
5. each one could exert a force on the surface of the ground.

(x) The destruction of ozone layer in the atmosphere has led the world to disasters caused by:

1. absorption of the background radiation. 
2. poor handling of the radioactive materials.
3.  the increase of the ultra-violet radiations on the earth. 
4.  poor utilization of radioactive materials. 
5.  poor disposal methods of radioactive remains.

1. THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL CERTIFICATE OF SECONDARY EDUCATION EXAMINATION

031/1 PHYSICS 1

(For Both School and Private Candidates)

TIME: 3 Hours  Friday morning 19/10/2007

Instructions

1. This paper consists of sections A, B and C.

2. Answer all questions in section A and B, and two (2) questions from section C.

3. Section A carries 20 marks, section B carries 60 marks and section C carries 20 marks.

4. Cellular phones are not allowed in the examination room.

5. Write your Examination Number on every page of your answer booklet(s).

6. Where necessary use the following constants: 

Acceleration due to gravity g = 9.8 m/s²

Pi =

SECTION A (20 Marks)

Answer all questions in this section.

1. For each of the items (i) ­ (x) choose the correct answer from among the given alternatives and write its letter beside the item number.

(i) A stone is thrown horizontally from the top of a building at a speed of 12 m/s. How long does it take to fall 45 metres vertically? (Assume negligible air resistance).

1. 1.0 sec. 
2. 5.0 sec. 
3. 3.0 sec. 
4. 8.0 sec. 
5. 2.14 sec.

(ii) Which of the following statements is correct? 

1. Friction acts in the same direction as motion.
2. Air friction can cause a body to become hot.
3. Certain lubricants can reduce friction to zero.
4. For a given body the frictional force depends on the area in contact with the surface. 
5. Walking would be made easier if friction did not exist.

(iii) The dew point is defined as the

1. rate at which water vapour present in the atmosphere evaporates
2. amount of water on grass found in the morning
3. amount of water vapour required to saturate air
4. water vapour content of the atmosphere
5. temperature at which water vapour present in air is just sufficient to saturate it.

(iv) When a pipe is played a sound wave x is produced inside the pipe and a sound Y is heard outside the pipe, then

1. x is transverse and Y is longitudinal
2. x and Y are both transverse waves
3. x is progressive and Y is stationary
4. x is stationary and Y is a progressive wave
5. x is progressive and Y is longitudinal.

(v) When a lighted match is brought near the negatively charged electroscope, the leaf of the electroscope collapses because the

1. heat increases molecular vibrations which knock off the electrons from the cap
2. flame provides energy for the electrons to escape from the cap
3. match emits Y-rays
4. positive charges from the air ionized by the flame are attracted by the cap
5. match emits ?-particles.

(vi) In the circuit shown in figure 1 the battery and the ammeter have negligible internal resistance. What will be the ammeter reading?

Fig. 1

1. 2.5 A 
2. 0.4 A 
3. 0.5 A 
4. 1.6 A 
5. 2.0 A

(vii) A conductor becomes a magnet when 

1. it is wrapped with a coil of wire
2. a soft iron core is used
3. an electric current flows through it
4. its resistance is increased
5. It is passed through an electric field

(viii) A mixed beam of Y-particles, ?-particles and ?-rays enters a magnetic field at right angles to the direction of the beam. Which of the following best represent the correct paths taken by the radiations?

(ix) A semi conductor diode is used for 

1. producing a.c. from a d.c. power supply
2. rectification
3. controlling energy losses
4. amplification
5. supplying heat in some electrical devices.

(x) Saturn as a member of the solar system

1. is the largest planet with no known satellites
2. is the planet seen by naked eye satellites with a temperature ­200°C
3. is the planet only seen through telescope and is the furthest from the sun
4. has five moons and a ring system
5. is the second largest planet with known natural satellites and a ring system.

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL

CERTIFICATE OF SECONDARY EDUCATION EXAMINATION

031/1  PHYSICS 1

(For Both School and Private Candidates)

TIME: 3 Hours  2006/10/13 a.m.

Instructions

1. This paper consists of sections A, B and C.

2. Answer all questions in section A and B, and two (2) questions from section C.

3. Cellular phones are not allowed in the examination room.

4. Electronic calculators are not allowed in the examination room.

5. Write your Examination Number on every page of your answer booklet(s).

6. Whenever necessary use the following constants:

Acceleration due to gravity g = 9.8 m/s²

Specific heat capacity of water Cw = 4200 J/kg K

SECTION A (20 Marks)

Answer all questions in this section.

1. For each of the items (i) ­ (x) choose the correct answer from among the given alternatives and write its letter beside the item number.

(i) Metals conduct heat better than non­metals because:

1. metals are good conductors of electricity
2. metals have free electrons while non­metals have not
3. molecules of metals have higher velocity than that of non­metals
4. metals are normally of high specific heat capacity
5. the crystalline structure of metals is more compact than that of non­metals.

(ii) A metre rule is pivoted at point A as illustrated by the diagram below and balanced by a force of 2.5 N.

Figure 1

The mass of the metre rule in kilogram is given by:

1. 0.15 
2. 2.50 
3. 0.10 
4. 0.25 
5. 1.50

(iii) Which of the following will not affect the rate of evaporation of water in a dam?

1. Surface area 
2. Depth
3. Humidity
4. Barometric pressure
5. Temperature.

(iv) Aluminium has a specific heat capacity more than twice that of copper. Identical masses of aluminium and copper, both at 0°C are dropped together into a can of hot water. When the system has come to equilibrium

1. aluminium is at a higher temperature than copper
2. aluminium and copper are at the same temperature
3. copper is at a higher temperature than aluminium
4. temperature difference between the copper and aluminium depends on the amount of water in the can
5. the temperatures of the copper and aluminium will be higher than that of water.

(v) In the diagram below (fig. 2) a beam of white light entering a triangular glass prism is refracted and dispersion of colour occurs.

Figure 2

A thermometer placed at Y records a rise in temperature from the radiation produced. The correct name for this radiation is

1. ultra violet 
2. x-­rays 
3. gamma rays
4. infra­red 
5. beta particles

(vi) A wire of uniform cross­sectional area has a length of 10 m, a resistance of 2 ? and a resistivity of 2 x 10^­-7?m. The cross sectional area in m² is:-

1. 2 x 10^-4
2. 1 x 10^-5
3. 0.5 x 10^­-5
4. 1 x 10^-6
5. 5 x 10^-4

(vii) When the plastic pen is rubbed against dry hair, the pen attracts small pieces of paper. This means that the:

1. hair becomes negatively charged
2. hair becomes positively charged
3. pen loses electrons
4. hair gains electrons
5. paper loses electrons.

(viii) Electric pressure is measured in

1. current
2. volts 
3. watts
4. ampere
5. force.

(ix) In the circuit diagram below (fig. 3) A, B, C and D are just positions and the switch is closed.

Fig. 3

Choose the correct statement.

1. The current at A will be different from the current at B
2. The two lamps are wired in parallel
3. The current reaches B before it reaches C
4. With an extra lamp at D the current will be low
5. With an extra lamp at A the batteries will run down immediately.

(x) The property which distinguishes longitudinal waves from transverse waves is the

1. ability to be refracted
2. need for a material medium
3. relative directions of oscillations and propagation
4. wavelength
5. the speed of propagation.

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL

CERTIFICATE OF SECONDARY EDUCATION EXAMINATION 031/1 PHYSICS 1 

(For Both School and Private Candidates)

Time: 3 Hours Friday, October 14, 2005 a.m.

Instructions

1. This paper consists of sections A, B and C.

2. Answer all questions in sections A and B and two (2) questions from section C.

3. Electronic calculators are not allowed in the examination room.

4. Cellular phones are not allowed in the examination room.

5. Write your Examination Number on every page of your answer booklet(s).

6. Where necessary use the following constants:

Acceleration do to gravity g = 9.8 m/s².

Coefficient of linear expansion of brass = 0.000019/°C.

Coefficient of linear expansion of iron = 0.000012/°C. Pi π = 22/7

SECTION A (20 marks)

Answer all questions

1.For each of the items (i) - (x) choose the correct answer from among the given alternatives and write its letter beside the item number.

(i)An auto mechanic wants to measure the diameter of a wire to the nearest 0.001 cm. Which of the following instruments can be used?

1. Vernier caliper
2. Micrometer screw gauge
3. Metre rule
4. Pair of compasses
5. Engineer's calipers.

(ii)The mass of 1.5 litres of water is ___________ kg.

1. 1500
2. 150
3. 15
4. 1.5
5. 0.15

(iii)A rectangular wooden block of density 0.8 g/cm³ has dimensions 0.5 m x 0.8 m x 6 m. What maximum pressure will it exert on the ground? ________________ N/m².

1. 48,000
2. 4,000
3. 2.4
4. 19,200
5. 400

(iv)Land and sea breezes, ventilation of rooms and cooling systems of refrigerators and deep freezers are associated with one of the following processes of heat transfer

1. conduction
2. evaporation
3. radiation
4. expansion
5. convection.

(v)A blue dress with red spots when viewed in red light will appear

1. completely red
2. completely magenta
3. blue with red spots
4. magenta with red spots 
5. black with red spots.

(vi) A lens is used to form an image of a bright object on a screen. The effect of covering the top half of the lens with a card is to

1. make the image less bright 
2. make the image go out of focus
3. make the image disappear 
4. remove the top half of the image
5. remove the bottom half of the image.

(vii) The size of the induced current in a dynamo depends on the following except

1. strength of the magnet 
2. shape of the magnet 
3. pressure in the dynamo 
4. speed of rotation of the coil 
5. number of turns in the coil.

(viii) A horizontal electron beam passes between two parallel horizontal plates X and Y with X above Y. When a high tension battery is connected with its -ve pole to x and +ve pole to Y, the beam is deflected

1. upwards 
2. downwards at 45° to the horizontal
3. upwards at 45° to the horizontal
4. sideways
5. downwards.

(ix) Which of the following can be common to α-particles, β-particles and γ-rays?

1. possess electric charges
2. can be deflected by magnetic fields
3. can be deflected by electric fields 
4. can ionize the air
5. can be absorbed completely by a very thin aluminum foil.

(x) A transistor in figure 1 is connected in the common-emitter mode. What should be the sign of the potentials at point 1, 2 and 3?

Fig.  1

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL CERTIFICATE OF SECONDARY EDUCATION EXAMINATION

031/1 PHYSICS 1

(For Both School and Private Candidates)

TIME: 3 Hours  Friday November 05, 2004 a.m.

Instructions

1. This paper consists of sections A, B and C.

2. Answer all questions in section A and B, and two (2) questions from section C.

3. Cellular phones are not allowed in the examination room.

4. Electronic calculators are not allowed in the examination room.

5. Write your Examination Number on every page of your answer booklet(s). 6. Whenever necessary use the following constants:

Specific heat capacity of Aluminium,

CAL = 920 J kg^­1 K^­1

Specific latent heat of fusion of Aluminium LAL = 3.2×105 J kg­1

Melting point of Aluminium = 660°C

SECTION A (20 Marks)

Answer all questions in this section.

1. For each of the items (i) ­ (x) choose the correct answer from among the given alternatives and write its letter beside the item number.

(i) The movement of liquid from low to high concentration through a semi­permeable membrane is called

1. diffusion
2. fusion
3. osmosis 
4. osmotic pressure
5. Brownian motion.

(ii) What would happen to the planets moving around the sun if the gravitational force suddenly disappeared?

1. The planets would fuse together
2. The planets would fly far away opposite to the sun’s direction
3. The planets would move tangentially to their orbits in a straight line
4. Some planets would fall onto other planets nearby
5. Some of the planets would collide.

(iii) In a correctly fused plug, the cartridge fuse is connected between the

1. neutral lead and live lead
2. live lead and live pin
3. neutral lead and earth lead
4. live lead and earth pin
5. positive lead and negative lead.

(iv) The weight of a body is 20 N in air, 15 N when totally immersed in water and 18 N when totally immersed in liquid L. What is the relative density of L?

1. 5 N
2. 0.4 
3. 0.4 N 
4. 2.5 
5. 0.5.

(v) A certain wave has a period of 0.2 sec and a wavelength of 60 cm. What is the velocity of the wave in cm/s?

1. 30 
2. 0.30 
3. 12 
4. 3 
5. 300.0.

(vi) A convex mirror always forms

1. real images only
2. virtual images only
3. inverted real images only
4. magnified virtual images only
5. real and virtual images depending on the position of the object.

(vii) One advantage of a lead­acid accumulator is that

1. its internal resistance is high
2. no chemicals are used
3. its e.m.f. is more than 15 V
4. it can be recharged
5. it supplies only a small current.

(viii) The unit of electric charge is

1. ampere 
2. volta
3. coulomb 
4. ohm 
5. ameter.

(ix) A wire carries a current i horizontally between the magnetic poles N and S which face each other on a table (see Fig. 1 below).

Fig. 1

The direction of the force on the wire due to the magnet is

1. from N to S
2. from S to N
3. opposite to the current direction
4. vertically upwards 
5. in the direction of the current.

(x) Which of the following statements is not correct?

1. The forbidden energy gap in conductors is very wide
2. The majority charge carriers in p­type semi­conductors are holes
3. An integrated circuit (IC) has a combination of several resistors and transistors built out of the same crystal.
4. Cathode rays consist of a beam of accelerated electrons
5. X­rays are electromagnetic radiation of short wavelength.

(ii) When an object moves around a horizontal circle of centre O with a constant speed, its acceleration will be

1. zero
2. towards the centre
3. away from the centre
4. along the tangent to the circle
5. along the direction of rotation.

(iii) A bar of copper is heated from 293 K to 333 K. Identify a false statement among the following:

1. Its density will increase slightly
2. Its length will increase slightly
3. Its electrical conduction will decrease slightly
4. Its mass will not change
5. Its weight will remain unchanged.

(iv) The direction of heat flow between two bodies is determined by

1. the direction of the wind
2. the mass of each body
3. the temperature difference of the two bodies
4. the coefficient of cubical expansion of the bodies
5. the coefficient of linear expansion of the bodies.

(v) Refractive index of a glass block cannot be evaluated from one of the following ratios:

1. sin i to sin r
2. Velocity of light in air to velocity of light in glass
3. Frequency of light in air to frequency of light in glass
4. Wavelength of light in air to wavelength of light in glass
5. Real depth to apparent depth.

(vi) Which among the following is not a property of magnetic lines of force due to a bar magnet?

1. They have a direction from North Pole to South pole outside the magnet
2. They do not exist inside the magnet
3. They have a direction from South pole to North pole inside the magnet
4. They tend to be close inside the magnet but are wider apart outside the magnet 
5. They form complete loops.

(vii) When charging a body by friction, the particles which are transferred are

1. protons
2. nuclei and protons
3. nuclei
4. electrons
5. protons and electrons.

(viii) Which of the following statements is correct?

1. Electrons but not X­-rays are deflected by magnetic field
2. Electrons and X-­rays are both particles
3. Electrons are deflected by magnetic field but not by electric field
4. Electrons are heavy particles
5. Electrons and X­rays are both deflected by magnetic field.

(ix) Cathode rays are

1. a stream of energy
2. used to examine a complete machine without dismantling it
3. a stream of molecules
4. a stream of electrons
5. used to detect flaws and cracks in metal casings and welded joints.

(x) A transistor is a device which

1. amplifies alternating current or voltage
2. amplifies direct current or voltage
3. rectifies direct current or voltage
4. amplifies and rectifies alternating current or voltage
5. rectifies alternating current.