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Name: ……………………………………………………Stream:…………………….
Marking Guide
END OF YEAR 2014
S.3 PHYSICS PAPER 1
TIME: 2HOURS
Instructions:
 Write your name, stream/number clearly in the space above
 Section A contains 40 objective type questions. You are required to write the
correct answer A, B, C or D in the grid provided on page one
 Section B contains 6 structured questions
 Answers are to be written in the spaces provided in the question paper
 Acceleration due to gravity
=
 Density of water
=
10ms-2
1000kgm-1
1.C
6.A
11.D
16.D
21.B
26.A
31.C
36.D
2.C
7.A
12.B
17.B
22.D
27.A
32.B
37.B
3.C
8.D
13.A
18.B
23.B
28.A
33.B
38.D
4.B
9.A
14.C
19.A
24.B
29.B
34.C
39.C
5.B
10.A
15.C
20.A
25.B
30.C
35.D
40.D
SECTION A
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1. The graph in figure below describes motion of a body. Between which points is
the body at rest?
A)
MQ
B)
MO
2. A rainbow is an example of,
A)
mirage
C)
dispersion
C)
OP
B)
D)
D)
PQ
diffraction
interference
3. A hollow glass sphere of mass 60kg floats in water such that
2
of its volume is
3
submerged in water of density 1g/cm3. Find the volume in m3 of the sphere.
A)
0.020
B)
0.040
C)
0.090
D)
0.060
4. A notch on a material spreads more rapidly when the material is;
A)
reinforced
B)
in tension
C)
pre stressed
D)
in compression
5. A weight of 20N stretches a spring by 0.5cm. Calculate the extension when the
applied weight is 60N.
A)
0.25cm
B)
1.5cm
C)
2.0cm
D) 4.0cm
6. State the energy changes which occur when the headteacher addresses a big crowd
of students using a microphone.
A) sound energy
electric energy
sound energy
B) electrical energy
sound energy
C) chemical energy →
sound energy → electrical energy →sound energy
D) chemical energy
kinetic energy
sound energy
7.
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In the figure above, a fixed mass of dry gas is trapped in bulb M. Determine the
total pressure of the gas in M, given that the atmospheric pressure is 760mm of
mercury.
A)
106cm Hg
B)
38cm Hg
C)
30cm Hg
D)
46cm Hg
8. The eclipse of the sun takes place when the shadow of the
A)
earth falls on the moon
B) sun falls on the moon
C)
moon falls on the sun
D) moon falls on the earth
9. A stone of 1kg rests at a point 10m high. If its released from its position of rest, its
kinetic energy just before landing will be;
A)
100J
B)
10J
C) 0.1J
D)
1000J
10. Determine the force that is required to give a mass of 500000mg an acceleration
of 2 x 10-2ms-2.
A)
0.01N
B)
10N
C)
100N
D)
10000N
11. Figure below shows a cone resting on a table. If it has a radius of 50cm and a
mass of 400g, find the pressure it exerts on the table.
10cm
Table
50cm
A)
0.25
Nm  2
4
12.
B)
4
Nm  2
25
body
C)
25
Nm  2
4
D)
4
Nm 2
0.25
N
3N
From the figure above,12N
find the value of x if the magnitude of the resultant force
is 13N.
A) 1N
B) 2N
C) 4N
D) 5N
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13. A ray of light travels from medium B to A as shown below
Which of the following statements is true?
A)
medium A is denser than medium B
B)
light travels slower in medium B than in medium A
C)
medium A is less dense than medium B
D)
light travels faster in A than in B
14. Which of the following are all brittle materials?
A)
leather, rubber, thread
B)
clay, glass, wood
C)
glass, cast iron, stone
D)
rubber, polyster, copper wire
15. The amount of space occupied by an object is its
A)
Mass
B)
Weight
C)
Volume
D)
Density
16. Which of the following quantities increases when the mass of the body increased?
A) Velocity
B) Acceleration
C) Displacement
D) Momentum
17. A girl of mass 20 kg develops a power of 20 W on climbing steps in 120 s. If each
step is 0.2 m high, find the number of steps.
20×20
20×0.2
A)
B)
20×0.2
B)
20×120
200×0.2
20×120
D)
0.2×200
20×120
18. Which of the following increase the stability of the body?
(i)
Raising the centre of gravity.
(ii)
Lowering its centre of gravity
(iii) Making its base narrow
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(iv)
A)
C)
Making its base wide.
(i) and (iv) only.
(i) and (iii) only.
B)
D)
(ii) and (iv) only.
(ii) and (iii) only.
19. A person stands 5 m away from the mirror. Find the distance that the person must
move in order to be 2 m away from the image in the mirror.
A)
1m
B)
3m
C)
4m
D)
7m
20. Which of the following factors enable(s) a small effort to lift a large load in a
hydraulic press?
(i)
Pressure is transmitted equally in all directions.
(ii)
Small piston produces high pressure.
(iii) The load experiences a large force.
A)
C)
(i) only.
(i) and (ii) only.
B)
D)
(i) and (iii) only.
(i), (ii) and (iii).
21. The figure below shows forces of 15 N and 3N acting on a mass M
If the frictional force on the ground is 6 N, find the resultant force on M
A)
C)
6N
!8 N
B)
D)
12 N
24 N
22. A liquid of density 1.03 x103kgm-3 fills a vessel of uniform cross-sectional area
of
10-4 m2 to a depth of 0.24m. Calculate the force exerted by the liquid on the
bottom of the vessel.
A) 1.03 x10-1 N B) 2.472x10-1N
C) 1.03N
D) 2.472N
23. The source of geothermal energy is
A)
Sun.
C)
Moon.
B)
C)
Earth.
Water.
24. A smoke cell is used to demonstrate phenomenon called
A)
diffusion
B)
Brownian Motion
C)
capillarity
D)
surface tension
25. A body is in neutral equilibrium if
(i)
It returns to its original position after a small displacement.
(ii)
Its centre of gravity remains at the same height when slightly displaced.
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(iii)
A)
It overturns when slightly displaced.
(i) only
B)
(ii) only
C)
(i) and (ii)
D)
(i) and (iii)
26. Two girls S and M are standing along a straight line in front of a plane mirror in
their dormitory. If S is 1m from the mirror and the image of M is 4 m from M, find
how far apart from each other.
A)
2.0 m
B)
4.0 m
C)
1.0 m
D)
3.0 m
27. A body starts from rest and accelerates uniformly at a rate of 8 ms-1. Find the time
it takes to cover a distance 100 m.
A)
25.0 s
B)
12.5 s
C)
5.0 s
D)
3.5 s
28. Where must an object be placed in order for the size of the image formed to be
same as the size of the object for a concave mirror.
A) at C
B) at F
C) between F and C
D) between F and P
29. An eclipse of the sun by the moon occurs when the
A) Earth passes between the moon and the sun.
B) Moon passes between the sun and the earth.
C) Sun passes between the moon and the earth.
D) Sun, the moon and the earth are not in a straight line.
30. A driver uses a convex mirror as his driving mirror because it;
(i)
Forms an upright image.
(ii)
Gives a wide field of view.
(iii) Gives a bigger magnification.
A)
Only (i)
B) only (ii) C)
(i) and (ii)
D) (i), (ii) and (iii)
31. A force of 5 N changes the momentum of a body from 50 kgms1 to 250 kgms1
.Find the time taken.
A)
0.0017 s
B)
0.25 s
C)
40 s
D)
60 s
32. The refractive index of a medium can be expressed as
sin 𝑟
𝑟𝑒𝑎𝑙 𝑑𝑒𝑝𝑡ℎ
𝑎𝑝𝑝𝑎𝑟𝑒𝑛𝑡 𝑑𝑒𝑝𝑡ℎ
A)
B)
C)
sin 𝑖
𝑎𝑝𝑝𝑎𝑟𝑒𝑛𝑡 𝑑𝑒𝑝𝑡ℎ
𝑟𝑒𝑎𝑙 𝑑𝑒𝑝𝑡ℎ
D)
1
sin 𝑟
33. The type of the image formed by the convex mirror when a real object is placed in
front of it.
A)
real, magnified and erect
B) virtual, diminished and erect
C)
real, erect and diminished
D) virtual, magnified and
erect
34. Express 760mmHg in SI units. Take density of mercury to be 13600 kgms1 .
A) 1.0336  10 5 Nm 2
B) 760pa
C) 1.0336  10 4 pa D) 76cmHg
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35. Which of the following statements is not true about pressure exerted by a liquid?
A) Varies with the depth of the liquid
B) Varies with the density of the liquid
C) Is the same in all directions at a given depth
D) Is higher at the top of a water tank.
36. A car of mass 1200kg moving with a velocity of 60ms -1 collides with another car
of mass 1000kg at rest and they stick together. Calculate the velocity after
collision.
1200+1000
1200+1000
1000×60
1200×60
A)
B)
C)
D)
1000×60
1200×1000
1200+1000
37. Fluid pressure can be measured using a
A) Barometer
B) Manometer
Lactometer
1200+1000
C) Hygrometer
D)
38. The diagram in figure below shows a uniform half metre rule suspended at a point
C
What is the value of the M?
A) 0.011kg
B) 0.125 kg
C) 0.020 kg
D) 0.025kg
39. The force in a string supporting a heavy object is called
A) Centripetal force B) elastic force C) tension force D) gravitational force
40. The figure shows the velocity time graph for a boda boda cyclist
Find the total distance covered by the boda boda.
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A) 150m
B) 225m
C) 450m
D) 825m
SECTION B
41. a) Distinguish between a strut and a tie.
(2mark)
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b) i) Define reinforced concrete.
(1mark)
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ii) State two advantages of reinforced concrete that makes it a desirable building material.
(2marks)
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42. a) What is meant by refractive index of a medium?
(1mark)
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b) A ray incident from glass at 430 enters water as shown. If the refractive index of
glass and water are 1.52 and 1.33 respectively, find r.
(3 marks)
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43. (a)
State one application of Archimedes’ Principle
(1 mark)
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(b)
A piece of iron weigh 175g in air and 153g in water. Find the density
Of the iron
(3 marks)
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44. a) State two ways of increasing stability of a body.
(1mark)
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b)
string
5cm
20cm
B
W
beam
0.5N
The figure above shows a beam of weight, W suspended on a string balancing with a
mass of weight 0.5N hang at B. Calculate the tension, T in the string.
(3marks)
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45. A spherical metal ball is dropped into a liquid in a tall container.
a) Sketch a graph to show the variation of velocity of the ball with time.
(2marks)
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b) Explain the features of the graph.
(2marks)
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46. a) State the principle of conservation of linear momentum.
(1mark)
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b) A car of mass 1 tone moving at 25ms-1 collides with a stationary car of mass 500kg.
After collision, the first car continues to move in the same direction with a velocity of
20ms-1. Calculate the velocity of the second car after collision and state its direction.
(3marks)
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*** END ***
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