THE PRESIDENT'S OFFICE
MINISTRY OF REGIONAL GOVERNMENT AND LOCAL GOVERNMENT
PRE-NATIONAL EXAMINATION SERIES-1
PHYSICS FORM-4
2020
TIME: 3:00 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 statement explains the basis of heliocentric theory?
(iii) Which among the following is a reason for the sky to appear blue while being observed from the earth?
(iv) The suspended magnetic needle always comes to rest with its axis in a vertical plane called?
(v) The correct arrangement of metals in ascending order of their linear expansivities is?
(vi) The loudness of a note produced by a vibrating object depends on?
(vii) In a black and white television, the image is formed on the screen by:
(viii) A green card with red flowers when viewed in a red light will appear:
(ix) 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?
(x) 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
2. Match the items in List A with 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) 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.
4(a) (a) Why the inner core of the earth is solid while the outer core is liquid? Briefly explain.
(b) The frequency obtained from a plucked string when the tension is 2 N is 400 Hz. Calculate the frequency when the tension is increased by 6 N.
5. (a) A sample of carbon isotope 146C has a half-life of 5700 years. What fraction of 146C will remain after 11400 years?
(b) Describe the construction and mode of action of the PN junction semiconductor.
6. (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.
7. (a) (i) Define the term astronomy.
(ii)Enumerate three importance of astronomy to mankind.
(b) (i) Specify the difference that exists between galaxy and a planet. (ii) Outline three defining characters of a planet.
8. (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?
SECTION C (25 Marks)
Answer two ( 2) question from this section.
9. (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?
10. (a) What is meant by the following terms?
(i) Asteroids.
(ii) Astronomy.
(b) Distinguish between:
(i) Constellations and a galaxy.
(ii) Meteor and meteorites.
(c) (i) Mention two types of tides.
(ii) With the aid of diagram, describe how ocean tides are formed.
11 (a) (i) Define the term semiconductors.
(ii) How do intrinsic semiconductors differ from extrinsic semiconductors?
(b) (i) List four properties of cathode rays.
(ii) Describe how x-ray tube is used to produce x-rays.
(c) (i) Mention three uses of induction coil.
(ii) Briefly explain the working principle of a bicycle dynamo.
LEARNINGHUBTZ.CO.TZFORM FOUR PHYSICS MODAL SERIES 24
LEARNING HUB TANZANIA
PHYSICS EXAMINATION FORM PHYSICS
MODEL EXAMINATIONS
NAME…………………………………………..CLASS……………………………TIME: 3HRS
INSTRUCTIONS:-
SECTION A: (15 MARKS)
(i) Swelling of soaked beans in water is the demonstration of:-
a) Capillarity (b) Diffusion (c) Osmosis (d) Viscosity
(ii) Which of the following is a property of a solid state?
a) Particles move randomly (b) Inter-particles distance is large
c) Particles are closely packed together (d) Particles are not closely packed together
(iii)The sun is an example of luminous body because it:-
a) Is a big (b) Is made by God
c) Reflects a light from the earth (d) produces its own light
(iv) A smell of rotten body can be felt through the process of:-
a) Osmosis (b) Evaporation (c) Transpiration (d) Diffusion
(v) The energy due to the rising and falling in the level of wate in the oceans or sease is known as:-
a) Electric energy (b) Water energy (c) Wind energy (d) Tidal energy
(vi) The following are applications of magnetism in daily life EXCEPT:-
(vii) An object with low centre of gravity and a wide base is :-
a) Neutral (b)Stable (c) Unstable (d) Unequilibral
(viii) A ball of mass 0.6kg is kicked vertically up to a height of 6M. the potential energy acquired by the ball is:-
a) 360J (b) 36J (c) 3.6J (d) 0.36J
(ix) A passenger in a bus which starts to move forward tends to fall backwards. This phenomenon demonstrates:-
a) The law of conservation of linear momentum
b) Newton’s first law of motion
c) Newton’s second law of motion
d) Newton’s third law of motion
x) What is the total resistance of two resistors, R1 = 3 and R2 = 6 connected in parallel?
a) 20 (b) 2 (c) 9 (d) 18
LIST A | LIST B |
(i) Attractive force between molecules of the same substance (ii) Bodies that give out light (iii) Device used to put on and off an electric current (iv) Measures mass of a body (v) Product of mass and velocity |
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SECTION B 70 Marks
(i) In the velocity – time graph, the slope represents ..............
(ii) The weight of a body when in immersed water is known as ..............
(iii) Devices for storing charge are called ...............
(iv) The type of force which causes an object to twist is called…………
(v) Verniar calipers measure both …………… and ……………. diameter of the cylinder.
(vi) A direction of path taken by light is called……..
(vii) Two types of shadows
(viii) …….is a curved surface of the liquid in a container
(ix) Three types of eclipses are……………..
4. a) Define fundamental frequency
b) Fundamental frequency of a certain is 175H2, Calculate frequency of the 4th Harmonic.
5. a) What is wavelength of the wave
b) 2m long string produces a standing wave with 3 loops. What is
i) Its wave length of 1st harmonic
ii) Fundamental frequency if velocity of sound in air is 340m/s
6. a) Define
i) Amplitude
ii) Periodic time
b) The 7th harmonic of a standing wave is 280 Hz. What is
i) Frequency of 3rd Harmonic
ii) Frequency of 4th overtone
iii) Wavelength of 9th harmonic if the speed of sound in air is 340m/s
7. a) List seven bands of electromagnetic spectrum.
b) Which one of the above bands (wave)
c) Name the wave with highest frequency than all.
8. An organ pipe 0.85m long is open at both ends. If the speed of sound in air is 340m/s.
a) Calculate fundamental frequency
b) What is the frequency of 4th harmonic?
c) What is the frequency of 5th overtone?
d) Calculate the wave length of 2nd overtone
9. a) Define the terms
i) Radioactivity
ii) Transmutation
b) Give decay equation for the following
i) Carbon 14 emitts beta to produce Nitrogen
ii) Iodine 131 with subscript 52 emitts beta particle to produce Xenon (x).
iii) neutron identify
c) The half life of radioactive element is 10 minutes. How long does it take for 90% of the element to
decay?
SECTION C 25 Marks
10. a) Define the following terms
i) Half-life
ii) Fission
iii) Fussion
iv) Artificial radioactivity
b) The half of years what does it mean?
c) Study the diagram below and use it to determine half-life of the element.
11. a) Define the following terms as used in reflection of light from curved mirror
i) Focal length
(ii) Radius of curvature
(iii) Centre of curvature
b) What is the meaning of
i) Real image
(ii) Virtual image
(iii) Magnified image
(iv) Diminished image
c) Draw a ray diagram showing the position of image formed when an object placed between C and F of
concave mirror, Hence describe the nature of image.
d) An object is place 20cm in front of concave mirror of focal length 15cm. calculate the position of
image formed.
10. a) Define Heat
b) What is thermopile?
c) Heat can travel through
i) Solid by __________
(ii) Liquid by ________
_ (iii) Gaseous by ____________
LEARNINGHUBTZ.COM.TZ Page 1
LEARNINGHUBTZ.CO.TZFORM FOUR PHYSICS MODAL SERIES 9
031
THE PRESIDENT’S OFFICE
REGIONAL ADMINISTRATION AND LOCAL GOVERMENT
FORM FOUR PRE-NATIONAL EXAMINATION SERIES
PHYSICS
TIME: 3 HOURS Friday JULY 2019
INSTRUCTIONS
Acceleration due to gravity, g = 10m/s2
Density of water = 1.0 g/cm3
Linear expansivity of iron = 1.24×105K-1 Specific latent heat of fusion of ice = 336J/g Velocity of sound in air = 340m/s
Pi, = 3.14
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) 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?
A. 0.005m
B. 6.020m
C. 0.020m
D. 4.520m
E. 1.57.
(ii) Which of the following electromagnetic waves is used to detect flaws and defects in
steel plates?
A. infrared waves
B. ultraviolet waves
C. xrays
D. gamma rays
E. micro waves.
(iii) A part of human eye that corresponds to the film in a camera is called
A. cornea
B. iris
C. lens
D. pupil
E. retina.
(iv) The sun generates its energy by a process called
A. thermonuclear fission
B. thermonuclear fusion
C. geothermal energy
D. geothermal fusion
E. 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?
A. 60cm
B. 40cm
C. 24cm
D. 12cm
E. 3cm.
(vi) What is the main function of step up transformer?
A. To change a.c to d.c current
B To decrease resistance in a circuit
C. To increase a.c voltage
D To decrease a.c voltage
E. To increase a.c current.
(vii) The most probable radiation forming a welldefined track when passed in a cloud chamber is called
A. Gammarays
B. Beta rays
C. Cathode rays
D. Alpha rays
E. Xrays.
(viii) The effect of adding an acceptor impurity to a silicon produce a crystal called
A. Ptype
B. Ntype
C. PNtype
D. NPtype
E. PNPtype.
(ix) Colours are produced when white light passes through glass prism
Because;
A Light waves interfere glass prism
B. Colours the light.
C. In glass different colours travel at different speeds.
D. Different colours are filtered
E. 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?
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 |
(i)The region nearest the earth of which most weather phenomenon occur. | A.Stratosphere |
(ii)The layer in which the ozone layer is found. | B. Atmosphere |
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(iii)The boundary which separates troposphere and |
|
stratosphere. |
|
| G. Exosphere |
(iv)The outermost region of the atmosphere. | H. Thermosphere |
|
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(v) The collective name given to troposphere and |
|
stratosphere. |
|
atmosphere. | M. Lower atmosphere |
| N. Tropopause |
SECTION B. 60 MARKS
3. For each of the items (i)(x), fill in the blank spaces by writing the correct answer in the answer booklet provided.
i. The rate of change of displacement is called………………………..
ii. The process whereby the eye can alter its focal length in order to form images of
objects at different distances is known as…………………………
iii. The rule used to deduce the direction of the magnetic field lines due to solenoid or a circular coil is called…………………………….
iv The function of an induction coil is to produce……………….
v. The wheatstone bridge is an electric device used to measure…………..
vi. A force which causes anticlockwise rotation is said to have a positive……….
vii. The kinetic theory of matter has been used to account for elasticity, surface tension
and____…………………….
viii. The quality of a note produced by a musical instrument depends on its fundamental frequency and………..
ix. The name given to the collection of heavenly bodies that revolve around the sun is……….
x. The increase in the average temperature of the world’s atmosphere refers to …………………… ( 10 marks)
4. (a) (i)What effect does an increase in temperature have on the density of most liquids?( 1mark)
(ii) Explain the procedure of using methylated spirit, water and a pendulum bob to find the relative density of spirit. ( 2marks)
(b) (i)State Archimedes’ Principle. ( 2marks)
(ii) Briefly explain why does a ship sink deeper in fresh water than in sea water? ( 2marks)
(c) When a piece of wood is put in a graduated cylinder containing water, the level of the water rises from 17.7cm3to 18.5cm3. Calculate the
(i) Mass of a piece of wood.
(ii) Total volume of a piece of wood given that its relative density is 0.60. (3 marks)
5. (a) Define the following terms:
(i) Coefficient of superficial expansion. (1 mark)
(ii) Anomalous expansion of water. ( 1 mark)
(b) (i)How much heat is needed to change 340g of ice at 0°C to water at 0°C? ( 2marks)
(c) (ii) What is the name of heat lost by ice in (b) (i) above? ( 2marks)
radius 8.92mm at 20°C. What temperature must the rivet be heated in order to fit into the hole? ( 4 marks)
6. (a) (i)State two ways in which the image formed in plane mirror differs from that in a pin hole camera.(2marks)
(ii) What is the effect of moving the pinhole camera closer to the object? ( 1marks)
(b) (i)List three rules used to locate images in curved mirrors.(3 marks)
(ii) Give two similarities and two differences that exist between the human eye and a lens camera.
( 2marks)
(c) A mirage is often seen by a motorist as a pool of water on the road some distance ahead.
(i) Draw a sketch diagram to show the formation of such a mirage. (1mark)
(ii) Briefly explain how mirage is formed. ( 1mark)
7. (a) (i)What is meant by the internal resistance of a cell? (1 mark)
(ii) Distinguish between a cell and a battery. ( 2marks)
(b) (i)Draw a well labeled diagram of a dry cell (Leclanche). (2 marks)
(ii) Identify three disadvantages of a Leclanche cell over a leadacid accumulators.
( 3marks)
(c) The current of 3.0A passes through a coil of resistance 5Ω connected to the terminals of a cell of constant e.m.f, E (Volt) and internal resistance, r (ohm). If a uniform wire of length, L (cm) is joined across the ends of a 5Ω coil to form a parallel arrangement of resistance 4Ω , the current is reduced to 0.25A. Determine the
(i) internal resistance of a cell. ( 1 mark)
(ii) e.m.f of a cell. ( 1 mark)
8. (a) (i) Define nuclear fission. ( 1mark)
(ii) Mention two products of nuclear fission. ( 2marks)
(b) Figure 1 shows a comparison of the penetrating power of three types of radiations.
Figure 1
(i) Identify the name of radiations represented by the letters A, B and C. ( 1 mark)
(ii) Write two properties of each type of radiation named in 8 (b) (i). ( 1 mark)
(iii) What effect does the radiation B has on the nucleus of an atom? ( 1 mark)
(c) Complete the following equations and for each name the type of decay.
(i) 22688Ra → --------+ 22286Rn ._____ ( 2marks)
(ii) 22286Rn → 2 −10e +---------------- (2 marks)
SECTION C (25 Marks)
Answer TWO questions from this section.
9. (a) What is meant by;
(b) Distinguish between the following terms;
( c) (i) Mention two tides of tides ( 2 marks)
(ii) With aid of diagram, describe how ocean tides are formed. ( 6 marks)
10. (a) (i) List four main parts of a ripple tank. ( 4 marks)
(ii) What role does a stroboscope play in a ripple tank experiment? ( 2 marks)
(b) (i) Explain why there are four strings of different thickness in a violin? ( 2 marks)
(ii) What does a violinist do to change the note emitted by a particular string? ( 1/2 marks)
(c) (i)Briefly explain how a resonance tube works. ( 2 marks)
(ii) Calculate the frequency of vibration in a resonance tube of shortest length
of 0.22m when the next resonance length is 0.47m. ( 2 marks)
11. (a) (i)State the functions of the hair springs in a moving coil galvanometer. ( 2 marks)
(ii) Explain why moving coil galvanometer is unsuitable for measuring alternating currents.
( 2 marks)
(b) (i)Draw the magnetic field lines pattern in a horizontal plane due to a current carrying straight conductor when a d.c flows through it. ( 2 marks)
(ii) What would happen on the pattern if a.c were used instead of d.c? ( 2 marks)
(c) (i)What should be done in order to increase the speed of rotation in a d.c electric motor? ( 2 marks)
(ii) An electric motor is connected by cable to a generator and produce a current of 10 A at 240V. Calculate the resistance of the cable. ( 21/2 marks)
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