THE PRESIDENT’S OFFICE MINISTRY OF EDUCATION, REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT
COMPETENCY BASED SECONDARY EXAMINATION SERIES
PHYSICS FORM THREE
TIME: 3 HOURS NOVEMBER 2022
Instruction
SECTION A [15 MARKS]
D.2.3 x 108m/s
E. 3.0 x 108m/s
Section B [60 marks]
Answer all questions
[b]. A ship is made of steel and it is expected that it should sink in water. However it does not sink. At the same time a coin once dropped in water it will sink. How can you solve this contradiction so as to help a form one student who is totally confused? [04 marks]
[b]. A meter rule is pivoted at its mid-point. If two objects of weigh 1.0N and 2.0N are suspended at 30cm and 90cm respectively from one end, calculate the position
[b]. The diagram below shows a ray of light incident on a glass prism at an angle.
Complete the diagram to show as it emerges from the other side [05marks]
[c]. Sketch a ray diagram to show the formation of a solar ellipse [03marks]
[b]. A cell supplies a current of 0.6A through a 2Ω coil and a current of 0.2Athrough a752Ω coil. Calculate the e.m.f and internal resistance of the cell [06marks]
[b]. A block and tackle system of 5 pulley is used to raise of 490N steadily through a is then 1800 J. calculate the efficiency of the system and efforts applied[06 marks]
(b) Describe two (2) defects of simple cell(4 marks)
Section C [25 marks]
Answer two [2] question form this section
(b) A 50kg girl runs up a staircase of 50 steps each step is 15cm in height in 5s. Find Work doneagainst gravity by the girl and Power she use to run(4 marks)
10. (a) A drum at station A is connected to a wire string at station B. A man at A beats the drum while another person at B places his ear at the wire and hears two sounds separated by the time interval of 0.5 seconds. If the velocity of sound in the wire string is 5280m/s. How far apart are the two men. (5 marks)
(b) How long will it take a 240V, 3000W electric immersion heater to raise the temperature of 150 litres of water in a well lagged copper tank of mass 20kg from 15℃ to 70℃. Also find the cost at 5 shillings per kwh. (5 marks)
11. (a).A plane mirror and concave mirror both they produce an image from the given object. Draw the diagram to represent the formation of image in each case (for the concave mirror consider an object to be at the center of curvature, (C). Hence show two similarities and two differences of images formed. ( 6 marks)
(b) Explain the formation of mirage (4 marks)
LEARNINGHUBTZ.CO.TZFORM THREE PHYSICS EXAM SERIES 112
THE PRESIDENT’S OFFICE
REGIONAL ADMINISTRATIVE AND LOCAL GOVERNMENT
FORM THREE EXAMINATIONS SEPT 2022
NEW NECTA FORMAT
PHYSICS
PHYSICS FORM THREE
Where necessary use the following constants
Acceleration due to gravity (g) = 10m/s2
Density of water = 1g/cm3/ 1000kg/m3
ATTEMPT ALL QUESTIONS IN THIS SECTION
LIST A | LIST B |
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SECTION B (60 MARKS)
ATTEMPT ALL QUESTIONS IN THIS SECTION
(b)A convex mirror of focal length 15cm is used to produce an image an object placed 20cm from the pole of the mirror
Find the position and nature of the image formed
(b)A bird is plying at 80/km/hr. due East relative to the air. A wind is blowing at 30km/hr in the north East direction as seen from the ground. What is the velocity of the bird relative to the observer on the ground?
(c) Identify three ways of reducing friction force acting on a body
(b)A uniform beam of mass 50kg and length 6m is supported by two vertical strings at A and B such that each pant is 0.5m from each end A mass of 40kg is also hung at m from A. Find the tension in the strings at points A and B
(ii) Explain the important of the following on a hydrometer
(b) A cube of side 10cm and mass 400g floats in water
(b)A compound microscope has objective lens of focal length 8cm and eyepiece lens of focal length 4cm the distance between the lenses is 28cm. the lens is adjusted such that the final image is at infinity
(b)A wheel and exle has wheel radius of 20cm and axle radius of 5cm. The efficiency of the machine is 90%
SECTION C
ATTEMPT ANY TWO QUESTIONS IN THIS SECTION
(b)The figure below shows a bimetallic strip having two metals invar and brass. (Brass has a higher linear expansitivity than invar)
Explain how the bar will bend if it is heated to a higher temperature than room temperature
(c) A telegraph wire has a length of 30m and is made of metal of linear expansitivity 0.00002/K
Find the change in length from a hot day temperature 30°C to a very cold day - 5°C
(b)Explain why coefficient of Kinetic friction is always smaller than coefficient of state friction
(c)Three forces act on a body as shown below
Find the value of T and F
(b)Convex mirrors are always used as driving mirrors. With the aid of a diagram explain why these kinds of mirrors are used in this case
(c)What is the maximum magnification produced by a convex lens of local length 5cm.
LEARNINGHUBTZ.CO.TZFORM THREE PHYSICS EXAM SERIES 95
THE PRESIDENT’S OFFICE
MINISTRY OF EDUCATION, REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT
COMPETENCE BASED SECONDARY EXAMINATION SERIES
PHYSICS TERMINAL EXAMINATION
FORM THREE-2022
INSTRUCTIONS
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.
2. Match the items in list A with the responses in list B by writing the letter of the correct response
beside the item number.
LIST A | LIST B |
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SECTION B (60 Marks)
Answer all questions in this section.
3. (a) (i) Explain the pressure of a gas in terms of the kinetic theory of gases. (2 marks)
(ii) How is diffusion explained by the kinetic theory of gases? (2 marks)
(b) (i) State Charles’s Law. (1 mark)
(ii) Sketch the graph of volume against temperature for a perfect gas.(2 marks)
(c) (i) What is the absolute zero of temperature?(1 mark)
(ii) 150 cm 3 of dry gas at 30°C was heated until its volume became 450 cm 3 . What was the final temperature?
4. (a ) (i) Name, draw and mention one use of the three different types of diverging lenses?
(b) Where should an object be placed such that its image as formed by a converging lens will be
(i) at infinity (ii) of the same size (iii) erect?
(c) A nail 6.0 cm long is placed 15 cm away from a convex lens of focal length 10.0 cm. The nail
is stuck perpendicular to the optical axis of the lens. Determine the positions and height of the nail
5. (a ) Explain the terms potential energy and kinetic energy giving one example of each.
(b) A pendulum bob of mass 50g is pulled aside to a vertical height 20 cm from the horizontal and then
released. Find
(i) the maximum potential energy of the bob
(ii) the maximum speed of the bob
(c) (i) Suppose the length of the thread of the pendulum in discussion was 1.0 m, what could its periodic time of oscillation be?
(ii) State the principle applied by the pendulum experiment.
6.(a) A cricket ball of mass 180g bowled with a velocity of 20m/s is hit back towards the bowler at a velocity of 15m/s. The impact lasts for 0.4s. Calculate
(b). A car of mass 1000kg travelling at 36km/h is brought to rest by applying brakes. Calculate the distance travelled by the car before coming to rest, if the frictional force between the wheels and the road is 2 000N
(c) An effort of 250N raises a load of 900N through a distance of 5m. If the effort moves through 25m, calculate
7. Give scientific reasons for the following statements
8. Explain the following statements
9. (a) The extension produced in a spiral spring is 6cm when a mass of 300g is attached to it. Calculate the spring constant of the spring
(b) When a body of mass 400g is completely immersed in a liquid, the upthrust on the body is 1.4N. Find the weight of the body in the liquid.
SECTION C (10 Marks)
Answer one (1) question from this section.
10. (a) State Pascal’s principle of transmission of pressure. (01)
(b) A piston of small cross section area of 30.0 cm 2 is used in hydraulic press to exert a force
of 300.0N on the enclosed liquid. A connecting pipe leads to a large piston of cross
section area 600.0 cm 2 . Find
(i) the force sustained by the larger piston (03)
(ii) the force applied on the smaller piston to support 2.0 tonnes on the larger piston.
(03)
(iii) the mechanical advantage (MA) of the pistons of the press. (02)
11. (a) What is meant by magnetic materials? Give two examples.
(b) State the law of magnets.
(c) Explain with an illustration how one can locate the position of a north-pole of a bar magnet.
(d) Explain with an illustration how to magnetize a steel bar using an electric current.
LEARNINGHUBTZ.CO.TZFORM THREE PHYSICS EXAM SERIES 87
THE PRESIDENT'S OFFICE
MINISTRY OF REGIONAL GOVERNMENT AND LOCAL GOVERNMENT
MID TERM-1 EXAMINATION
PHYSICS FORM-3
2022- MARCH/APRIL
TIME: 2:30 HRS
Instructions
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?
(ii)Which one is a characteristic of a plane mirror?
(iii) The correct arrangement of metals in ascending order of their linear expansivities is?
(iv) Which of the following is the correct weight of a body of mass 48 g when placed on the moon surface?
(v)The correct formula to find the elastic force constant (k) of a spring is
(vi) Why is oil used as a lubricant?
(vii) A bar of copper is heated from 293 K to 333 K. Identify a false statement among the following:
(viii) Which among the following is not a property of magnetic lines of force due to a bar magnet?
(ix) When an object moves around a horizontal circle of centre O with a constant speed, its acceleration will be
(x) Which statement about a wet-and-dry bulb hygrometer is correct?
2. Match the items in List A with responses in List B by writing the letter of the correct response beside the item number in the answer booklet provided.
LIST A | LIST B |
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SECTION B (60 Marks)
Answer all questions in this section.
3. (a) Write down the second and third equations of motion in a straight line.
(b) Explain the following terms as they are applied in motion in a straight line:
(c)A stone is thrown vertically upwards with an initial velocity of 50 m/s.
(i) Calculate the time that the stone will take to return back to the thrower.
(ii) What will be the maximum height reached?
4. Three resistors of 2 Ω, 4 Ω and 6 Ω are connected in series to a battery of e.m.r 24 V and have negligible internal resistance.
(a) Draw the circuit diagram including the battery, ammeter, switch and the three resistors.
(b) Find the current flowing in the circuit drawn in 4 (a) above.
(c) Find the potential difference at the ends of each resistor in 4 (a).
5. (a) (i) What is meant by the term thermal expansion?
(ii) Mention two applications of thermal expansion of solids.
(b) (i) List three areas where bimetallic strips are used.
(ii) Why a bimetal strip made of brass and invar is curved outside with brass?
(c) Describe how simple fire alarm system operates.
6. (a) State Pascal’s principle of pressure
(b) What are the three factors that affect the liquid pressure?
(c) Calculate the area of an object if the pressure exerted is 0.2 N/m2 and its force is 2 N.
7. (a) What are the uses of the following devices?
(i) Manometer
(ii) Hare’s apparatus (inverted U-tube)
(iii) U-tube
(iv) Barometer
(b) Why a big Elephant manages to walk comfortably in muddy soil without sinking while a human being may sink easily?
8. (a) Mention three uses of current electricity
(b) Why is it advised to connect bulbs in parallel arrangement during installation of electricity in most buildings?
SECTION C (25 Marks)
Answer two (2) questions from this section
9.(a) State two conditions for a body to be in equilibrium.
(b) Distinguish between centre of mass and centre of gravity.
(c) A uniform metre rule AB is balanced horizontally on a knife edge placed 5cm from B with a mass of 60g at B. Find the mass of the ruler.
10.(a) Define the following terms as applied in Physics:
(i)Machine
(ii)Load
(b) Why is efficiency of machine less than 100%? Explain briefly.
(c) Simple machine was used to raise a load of weight 4000 N through a height of 0.8 m using an effort of 800 N. If the distance moved by effort was 4.8 m, calculate the: (i) Mechanical advantage. (ii) Velocity ratio.
11. (a) (i) Distinguish between primary and secondary cells, giving one example of each.
(ii) Identify two defects of a simple cell.
(b) (i) Explain why lead – acid accumulators are used in car batteries rather than dry cells?
(ii) A cell of unknown e.m.f, E and internal resistance 2? is connected to a 5? resistance. If the terminal p.d, V is 1.0V. Calculate the e.m.f, E of a cell.
LEARNINGHUBTZ.CO.TZFORM THREE PHYSICS EXAM SERIES 79
THE PRESIDENT’S OFFICE
MINISTRY OF EDUCATION, REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT
SECONDARY EXAMINATION SERIES
ANNUAL EXAMINATION
FORM THREE-NOVEMBER 2021
PHYSICS 1
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).
(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
(ii) Why is oil used as a lubricant?
(iii)Which one is a characteristic of a plane mirror?
(iv) In a light experiment, the results showed that less light was transmitted and the image was distorted. Which type of material was used?
(v) What quantity of heat is required to raise the temperature of 25 kg sample of mercury from 20°C to 30°C?
(vi) Why is Mercury preferred in clinical thermometers as a thermometric of a liquid to water and alcohol?
(vii) Which of the following is an example of a scalar quantity?
(viii)What role does the iris play in the human eye?
(ix) A launderer was thinking about a proper day for washing and drying clothes. Which day would he prefer most among the following?
(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 2.20Ω
2. Match the items in List A with responses in List B by writing the letter of the correct response beside the item number in the answer booklet provided.
LIST A | LIST B |
(i) Materials that can strongly be magnetized. (ii) Substance which are made up of soft iron. (iii) Materials that cannot be affected by magnets. (iv) Objects which are made up of steel. (v) Groups of magnetic dipoles arranged themselves in a magnetized object.
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SECTION B (60 Marks)
Answer all questions in this section.
3. (a) Briefly explain why hydrometer
(i) is weighed with lead shots.
(ii) has a narrow stem.
(b) A piece of rubber of volume 100 cm3 and the density of 0.45 g/cm3 floats in water. Calculate:
(i) The volume of rubber that partially immersed in water.
(ii) The force required to immerse the rubber completely.
4. (a) List four factors which affect the rate of evaporation of liquids.
(b) (i) Define relative humidity.
(ii) Calculate the relative humidity given that the reading on dry bulb hydrometer is 24°C and the wet bulb temperature reading is 16°C.
(c) With the aid of a sketched graph, explain how temperature affects the saturated vapour pressure of water.
5. (a) Briefly explain why hydrometer
(i) is weighed with lead shots.
(ii) has a narrow stem.
(b) A piece of rubber of volume 100 cm3 and the density of 0.45 g/cm3 floats in water. Calculate:
(i) The volume of rubber that partially immersed in water.
(ii) The force required to immerse the rubber completely.
6. (a) How does the increase of length and cross-section area of a conductor affect its resistance?
(b) (i) State the function of a circuit breaker in a wiring system.
(ii) Determine the ratio of resistance of wire A to that of wire B which are made up of the same material such that wire A has half the length and twice the diameter of wire B.
7. (a) Give two examples which illustrate the rectilinear propagation of light.
(b) (i) The refractive index of light passing from water to air is 3/4. Calculate the critical angle. (ii) Outline two differences between primary and secondary rainbows.
(c) In Figure 1, identify the names of colours labeled A, B, C, D, E, F and G.
11. (a) Mention two practical examples in our daily life in which the principle of conservation of energy is applied.
(b)(i) What is a simple pendulum.
(ii) Describe the energy changes that take place when a simple pendulum swings from one side to another.
(c)Name a machine or an apparatus used to change the following forms of energy.
SECTION C (25 Marks)
Answer two (2) questions from this section
9. (a) State the following rules:
(i) Cork screw rule.
(ii) Dynamo rule.
(b) (i) Give one structural difference between A.C. and D.C. generators.
(ii) Mention one application of induction coil.
(c) Figure 2 shows a transformer used to step down power. Assuming that there are no power losses, what will be the ammeter reading on the output part?
10. (a) (i) What is meant by the term thermal expansion?
(ii) Mention two applications of thermal expansion of solids.
(b) (i) List three areas where bimetallic strips are used.
(ii) Why a bimetal strip made of brass and invar is curved outside with brass?
(c) Describe how simple fire alarm system operates.
11.(a) (i) What are sustainable energy sources?
(ii) State four applications of energy generated from water.
(b)(i) Define geothermal energy.
(ii)Briefly explain how geothermal energy can be harnessed.
(c)(i) What is a windmill?
(ii)Mention three disadvantages of energy caused by wind. (iii) Does wind itself possess energy? Explain.
LEARNINGHUBTZ.CO.TZFORM THREE PHYSICS EXAM SERIES 71
THE PRESIDENT'S OFFICE
MINISTRY OF REGIONAL GOVERNMENT AND LOCAL GOVERNMENT
MID TERM EXAMINATION
PHYSICSFORM-3
2021- AUG/SEPT
TIME: 2:30 HRS
Instructions
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) A bar of copper is heated from 293 K to 333 K. Identify a false statement among the following:
(ii) Which among the following is not a property of magnetic lines of force due to a bar magnet?
(iii) When an object moves around a horizontal circle of centre O with a constant speed, its acceleration will be
(iv) The image formed by plane mirrors are always
(v) 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?
(vi) A body is said to be in equilibrium IF
(vii) 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?
(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
(ix) A green card with red flowers when viewed in a red light will appear:
(x) Colours are produced when white light passes through glass prism because
2. Match the following items.
List A | List B |
(i) Ability to oppose flow of current (ii) Path around which electrons can flow (iii) Wire with high potential difference relative to other wires in a cable (iv) Wire dipped into ground near home to protect appliances (v) Work done by moving unit of electricity from one point to another |
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SECTION B (60 Marks)
Answer all questions in this section.
3. (a) In a light experiment, a narrow beam of light directed onto a glass prism leaves the prism and falls on a white screen. Draw a labelled diagram to show the experimental set-up and observation seen on a screen.
(b) Explain two ways in which lens cameras differ from human eye.
4. (a) Briefly explain why hydrometer
(i) is weighed with lead shots.
(ii) has a narrow stem.
(b) A piece of rubber of volume 100 cm3 and the density of 0.45 g/cm3 floats in water. Calculate:
(i) The volume of rubber that partially immersed in water.
(ii) The force required to immerse the rubber completely.
5. (a) List four factors which affect the rate of evaporation of liquids.
(b) (i) Define relative humidity.
(ii) Calculate the relative humidity given that the reading on dry bulb hydrometer is 24°C and the wet bulb temperature reading is 16°C.
6. (a) (i) What peculiar property does the effort has in all classes of levers?
(ii) A metre rule of weight 1.0 N is supported horizontally on two knife edges each placed 10.0 cm from its ends. If the weight of 1.5 N is placed at its mid-point, calculate the reaction at the supports.
(b) (i) State the law of floatation.
(ii) Find the fraction of the cork that partially immersed when a piece of cork of density 0.25 g/cm3and a mass of 20 g floats in water.
7. (a) Write down the second and third equations of motion in a straight line.
(b) Explain the following terms as they are applied in motion in a straight line:
(c)A stone is thrown vertically upwards with an initial velocity of 50 m/s.
(i) Calculate the time that the stone will take to return back to the thrower.
(ii) What will be the maximum height reached?
8. Three resistors of 2 Ω, 4 Ω and 6 Ω are connected in series to a battery of e.m.r 24 V and have negligible internal resistance.
(a) Draw the circuit diagram including the battery, ammeter, switch and the three resistors.
(b) Find the current flowing in the circuit drawn in 8 (a) above.
(c) Find the potential difference at the ends of each resistor in 8 (a).
SECTION C (25 Marks)
Answer two (2) questions from this section
9. (a) A beaker containing ice is heated from -5°C to 0°C and then from 0°C to 15°C. With the aid of a diagram, explain the variation of density with temperature.
(b) A brick at 20°C has a dimension of 30 cm, 18 cm and 10 cm for length, width and height respectively. If a brick is heated to a new temperature of 150°C, calculate the new dimensions.
10.(a) State two conditions for a body to be in equilibrium.
(b) Distinguish between centre of mass and centre of gravity.
(c) A uniform metre rule AB is balanced horizontally on a knife edge placed 5cm from B with a mass of 60g at B. Find the mass of the ruler.
11. (a) Define the word coulomb.
(b) States Ohms law.
(c) Two resistors of 30 and 60 are connected in parallel to a 3V battery.
(i)Draw the schematic diagram.
(ii)Find the effective resistance of the circuit.
(iii)Calculate the current passing through the 60 resistor.
LEARNINGHUBTZ.CO.TZFORM THREE PHYSICS EXAM SERIES 62
THE OFFICE OF THE PRESIDENT
REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT
PHYSICS EXAMINATION FORM THREE
ANNUAL EXAMINATIONS.
NAME………………………………………..CLASS……………………………………………….TIME:2:30HRS
Instructions:
(i)Acceleration due to gravity, g = 10m/s2.
(ii)Density of water = 1.0g/cm3.
(iii)Pie, = 3.14.
(iv)Coefficient of linear expansivity of the brick = 1.2 10-5 K-1.
(v)Speed of light in air = 3 108 m/s.
(vi)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 correct answer from among the given alternatives and write
its letter beside the item number;
(i) The direction of the heat flow between two bodies is determined by;
(ii) A rectangular wooden block of density 0.8g/cm3 has dimensions 0.5m x 0.8m x 6m. Whatmaximum pressure will it exert on the ground?
(iii) Racing cars rarely get accidents despite their high speed because they;
(iv) When a bus starts or stops moving, passengers tend to be jerked forward or backwards. This is due to;
(v) In a uniform rod 1.0m long of mass 100g is supported horizontally on two knife edges placed 10.0cm from its ends, the reaction at the support when a 150g mass is placed at the midpoint of rod will be;
A. 250GB. 125NC. 1.25ND. 125KN
(vi) The SI unit of momentum is;
(vii) The area under a speed against time graph represents;
(viii) If the refractive index of water is 4/3, then the critical angle of water – interface is;
(ix) In concave lens parallel rays are;
(x) If a bottle capable of holding 200g of a liquid of density, 800kg/m3 is allowed to hold 160g of
sand of density 3200kg/m3 then the mass of water needed to fill the bottle is;
2. Match the items in LIST A with responses in LIST B by writing the letter of the correct responses.
LIST A | LIST B |
(i)Surface tension effect (ii)Maximum displacement of pendulum bob. (iii)Cooling by evaporation (iv)Thermopile (v)Impulse |
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SECTION B (60 Marks)
Answer all questions in this section.
3. (a) State the law of floatation
(b) A piece of a cork with volume 100cm3 is floating on water. If the density of cork is 0.25g/cm3,
(i) Calculate the volume of cork immersed in the water;
(ii) Calculate the force needed to immerse the cork completely (Assume mass of 1g = 0.01N).
4. (a) Define energy
(b) A ball of mass 0.2kg is dropped from a height 20M. On impact with the ground it loses 30J of
energy. Calculate the height it reaches on the rebound.
5. (a) What is meant by the terms;
(i) Heat capacity
(ii) Specific heat capacity
(b) Explain very briefly how heat losses have been presented in the vacuum flask.
6. (a) State the principle of moments
(b) A heavy mental boom AB of mass 25kg is supported at its ends. The beam carries a mass of 150kg
of a distance of 0.75m from end A. If the beam is 2m long, determine the thrust at support A and B.
7.(a) Define the following terms related to friction;
(i) Limiting friction
(ii) Normal reaction
(b) What is the normal reaction of body of mass 10kg placed on an inclined place of angle 30°
8. (a) Why a bubble of air increases in volume as it rises from the bottom of a pond of water to the surface? Briefly explain.
(b) A half meter rule AB is freely pivoted at 18 cm from end A and balances horizontally when a body of mass 35g is hung 48 cm from end B. Calculate the mass of the rule.
SECTION C (25 Marks)
Answer two (2) questions from this section.
9. (a) Electrical energy is distributed in all parts of Tanzania by the National grid system which transmits alternating current at a very high voltage. Explain why is it necessary to have a very high voltage?
(b) A generator producing a varying current from 0 to 10 A was allowed to flow in a coil of magnetic field. After a time interval the current was observed to be 4 A. Describe how back e.m.f. was induced in a self – induction.
(b) Calculate the quantity of heat required to melt 4kg of ice and to raise the temperature of water formed to 100°C
(ii) Write down the ideals gas equation
(iii) What does the term STD means?
(b) At a temperature of 50°C and a pressure of 74cm Hg the volume of a gas is 300cm3. Calculate the volume of the gas at STP.
LEARNINGHUBTZ.CO.TZFORM THREE PHYSICS EXAM SERIES 36
THE PRESIDENT'S OFFICE
MINISTRY OF REGIONAL GOVERNMENT AND LOCAL GOVERNMENT
AUGUST-SEPTEMBER EXAMINATION SERIES
PHYSICS FORM-3
2020
TIME: 2:30 HRS
Instructions
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?
(ii) When the sun shines on the dark-coloured driving wheel of a car, the wheel feels warm. Why?
(iii)Which one is a characteristic of a plane mirror?
(iv)What role does the iris play in the human eye?
(v) The correct arrangement of metals in ascending order of their linear expansivities is?
(vi) The suspended magnetic needle always comes to rest with its axis in a vertical plane called?
(vii) Which of the following is the correct weight of a body of mass 48 g when placed on the moon surface?
(viii) A car moving at steady speed has a frictional force on its surface whose size depends on its
(ix) The image formed by plane mirrors are always
(x)Lenz’s law can be applied to predict the
2. Match the items in List A with responses in List B by writing the letter of the correct response beside the item number in the answer booklet provided.
LIST A | LIST B |
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SECTION B (60 Marks)
Answer all questions in this section.
3. (a) Why a bubble of air increases in volume as it rises from the bottom of a pond of water to the surface? Briefly explain.
(b) A half meter rule AB is freely pivoted at 18 cm from end A and balances horizontally when a body of mass 35 g is hung 48 cm from end B. Calculate the mass of the rule.
4. (a) Briefly explain why hydrometer
(i) is weighed with lead shots.
(ii) has a narrow stem.
(b) A piece of rubber of volume 100 cm3 and the density of 0.45 g/cm3 floats in water. Calculate:
(i) The volume of rubber that partially immersed in water.
(ii) The force required to immerse the rubber completely.
5. (a) Give two examples which illustrate the rectilinear propagation of light.
(b) (i) The refractive index of light passing from water to air is 3/4. Calculate the critical angle. (ii) Outline two differences between primary and secondary rainbows.
6. (a) (i) What is the essential of kinetic theory of matter?
(ii) Sketch a graph showing how force applied in a stretched string varies with its extension.
(b) (i) State Hooke’s law.
(ii) List two applications of gamma rays.
7. (a) (i) Define turning effect of force and give its SI unit.
(ii) How the moment of force can be increased considerably in practical life? Give two examples.
(b) (i) List two factors that affect stability of a body
(ii) Briefly explain why the handle of a door is near its outside edge?
8. (a) (i) Distinguish between light spectrum and dispersion of light.
(ii) Briefly describe how a light ray passes through an equilateral glass prism.
(b) Study Figure 1 which represents three primary colours combines together and answer the questions that follow.
SECTION C (25 Marks)
Answer two ( 2) question from this section.
9. (a) (i) What is meant by the term thermal expansion?
(ii) Mention two applications of thermal expansion of solids.
(b) (i) List three areas where bimetallic strips are used.
(ii) Why a bimetal strip made of brass and invar is curved outside with brass?
(c) Describe how simple fire alarm system operates.
10. (a) (i) Distinguish between primary and secondary cells, giving one example of each.
(ii) Identify two defects of a simple cell.
(b) (i) Explain why lead – acid accumulators are used in car batteries rather than dry cells?
(ii) A cell of unknown e.m.f, E and internal resistance 2? is connected to a 5? resistance. If the terminal p.d, V is 1.0V. Calculate the e.m.f, E of a cell.
(c) (i) List two devices that are important when checking electrical faults in domestic appliances.
(ii) Briefly explain why a very high voltage is necessary when transmitting electrical energy from power station?
11. (a) (i) What is meant by impulse of a force?
(ii) Briefly explain why seat-belts are designed to stretch in a collision.
(b) i) Define momentum.
(c)A car of mass 2000 kg is travelling along a straight road at a constant velocity of 10 m/s developing 3.0 kilowatts. If the engine of the car is switched off:
LEARNINGHUBTZ.CO.TZFORM THREE PHYSICS EXAM SERIES 30
THE PRESIDENT’S OFFICE MINISTRY OF EDUCATION, LOCAL ADMINISTRATION AND LOCAL GOVERNMENT
PHYSICS- TERMINAL EXAMINATION-MAY
FORM THREE
Time 3:00 Hours MAY 2020
Instructions
SECTION A. 15 MARKS
1. (i) A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called?
(ii) The diameter of a lens is called?
(iii) Point at which all rays converge in termed as
(iv) Distance of virtual image and object is equal from mirror. This statement is
(v) Voltage is a form of:-
(vi) Ohm’s Law states which relationship between electrical quantities
(vii) Process of heat transfer that involves continual emission of infrared waves from surface of bodies and transmission of these waves without aid of medium is known as
(viii)Vacuum in a vacuum flask prevents heat transfer through process of
(ix) The act process or state of change in place or position of a body with respect to time and relative to observes is to be
(x) Which of the following is a type of motion?
2. Match the following items
List A | List B |
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SECTION B. 60 MARKS
3. (a) A Jet air plane travelling at speeding of 500km/h ejects its products of combustions at speed of 1500km/h relative to jet plane. Find speed of the later with respect to an observer on the ground.
(b) A car moving along a straight line with a speed of 126km/h is brought to a stop within a distance of 200m. What is the retardation of the car? And how long does it take for the car to stop?
4. (a) (i) What is meant by specific latent heat of vaporization.
(ii) Name two factors which affect the boiling point and freezing point of water.
(b) Explain in terms of kinetic theory of matter;
(i) What changes is taking place while the liquid is boiling?
(ii) Why it takes longer time to boil a tea on top of high mountains than at the sea level?
(c) (i) Define heat capacity
(ii) Calculate the final temperature of water formed if 8.4 KJ of heat is supplied to 0.02 kg of ice at 0 °C.
5. (a) What is meant by refraction of light?
(b) Mention the three points to be considered when drawing a ray diagram to form the image in lens.
(c) Mention four effects of refraction of light.
6. (a) What is sea wave energy?
(b) Explain three ways of harvesting sea wave energy
(c) Describe challenges of sea wave energy.
7. (a) State what you understand by
(b) Sketch lines of force between (2) bars of magnet placed horizontally on table with;
(c) Explain why;
8. (a) Explain the image formed by curved mirror in terms of:-
(b) An object 20cm high is placed 40cm from a concave mirror of focal length 15cm. Determine position, nature and size of image formed by drawing a ray diagram.
SECTION C
Answer only two questions from this section.
9. (a) What is a microscope?
(b)Explain how light microscope works
(c) Mention three uses of compound microscope.
(d)What is a projection lantern
(e) Give five uses of a projectile lantern.
10. (a) State the energy conversion is a solar cell and give two practical application of it.
(b) Explain why solar cells are not likely to be used to generate electricity in future?
(c ) Discuss the problems associated with fuel energy to the environment.
11. (a) Define the following terms;
(i) Evaporation (ii)Temperature.
(b) Give four differences between boiling and evaporation.
(c) An immersion heater rated 2kW is used to heat water of specific heat capacity 2200j/kgK in an insulated container of negligible heat capacity for 30minutes. Calculate the mass of water heated if the temperature of water rises from 20°C to 65°C.
LEARNINGHUBTZ.CO.TZFORM THREE PHYSICS EXAM SERIES 14
THE PRESIDENT’S OFFICE
MINISTRY OF EDUCATION AND VOCATIONAL TRAINING
MID TERM EXAMIATIONS
031 PHYSICS- THREE
Duration: 2:30 Hours
INSTRUCTIONS.
SECTION A (15 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) The irregular motion of tiny particles suspended in a fluid is called;
(ii) The colours which are added together to produce white light are called complementary colours, which of the following are complementary colours;
(iii) The property of the material to recover its original shape and size on removal of a stretching force is called;
(iv) A vector has both magnitude and direction and the examples are;
(v) The laws of vector addition are;
(vi) The forces of 4N and 3N act on a body due East and North respectively. The resultant force is;
(vii) The forces F1 = 5N, F2 = 13N and F3 are the equilibrium forces which act on a body as shown in the figure below;
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F3 F2
F1
The Magnitude of F3 is;
(viii) The relative velocity of a body is the velocity of a body with respect to another;
(ix) A floating body experiences an upthrust which is equal in magnitude to the;
(x) A bus carrying a very big load on its carrier can easily overturn because;
2. Match the times in List Awith responses in List B by writing the letter of the correct response beside the item number in the answer booklet provided.
LIST A | LIST B |
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SECTION B. 60 MARKS
3. (a) (i)What effect does an increase in temperature have on the density of most liquids?
(ii) Explain the procedure of using methylated spirit, water and a pendulum bob to find the relative density of spirit.
(ii) Briefly explain why does a ship sink deeper in fresh water than in sea water?
4. (a) Define the term friction.
(b) State the advantages and disadvantages of friction.
(c) State the laws of solid friction.
(d) A box of mass 50kg resting on a wooden floor force. Calculate the frictional force if the coefficient of dynamic friction
5. (a) Define pressure and state the SI unit.
(b) A Hare’s apparatus was used in experiment using methanol water the length’s of the methanol and water columns were found to be 16cm and 12cm respectively. Find the relative density of methanol if the length column of the ethanol was altered to 22cm.
6. (a) State and describe two factors on which pressure exerted by the liquid depends.
(b) Hydraulic press has a large circular piston of diameter 0.7M and circular piston to which the effort is applied is 0.2M. A force of 300N is exerted on a small piston. Find the force required to lift the heavy load.
7. (a) Whenever you want to remove a very tight nut from your bicycle you have to choose a longer spanner, why is it so?
(b) A rocket expels gas at the rate of 0.5kg/s. If the force produced by the rocket is 100 newtons, what is the velocity with which the gas is expelled?
8. A vehicle moves from rest with a uniform acceleration of 1.5m/s2 for the first 10s and continues accelerating at 0.5m/s2 for a further 20s. It continues at constant speed for 90s and finally takes 30s to decelerate uniformly to rest.
SECTION C. 25 MARKS
Answer all questions in this section
9. (a) Mention two conditions for an object to remain in equilibrium when subjected to a number of parallel forces
(b) A uniform bar 100cm long weighing 90g is suspended horizontally by two spring balances each holding the ends x and y. an 80g mass is hang 40cm from the end x. Calculate the reading of each spring balance in grams.
10. (a) Mention two factors affecting pressure in liquids
(b) Calculate pressure exerted by water at the bottom of a pond 76cm deep
(c) Mention any three applications of atmospheric pressure
11. Define the following terms;
LEARNINGHUBTZ.CO.TZFORM THREE PHYSICS EXAM SERIES 8