Name: …………………………………………………………… Index No.:……………………................
School: ………………………………………………………….
Candidate’s Sign:……………………...
Date:…..……………..…………………………….........................
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PHYSICS
PAPER 2
JULY/AUGUST - 2015
TIME: 2 HOURS
BUTERE EAST JOINT EVALUATION EXAM – 2015
Kenya Certificate of Secondary Education (K.C.S.E)
PHYSICS
PAPER 2
2 HOURS
INSTRUCTIONS TO THE CANDIDATES
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Write your name and indexnumberin the spaces provided above.
Sign and write the date of examination in the spaces provided.
This paper consists of twosections, A and B.
Answer all the questions in section A and B in the spaces provided.
All workingsmust be clearly shown.
Mathematical table and silent non programmable electronic calculators may be used.
Candidates should answer the questions in English.
For Examiner’s Use Only:SECTION
QUESTION
A
1 – 13
25
14
11
15
11
16
11
17
1
18
11
B
TOTAL SCORE
MAXIMUM SCORE
CANDIDATE’S SCORE
80
This paper consists of 8 printed pages.
Candidates should check the question paper to ascertain that all pages are printed as indicated.
And that no questions are missing.
©Butere East Joint Exam 2015
1Physics 232/2
1.
SECTION I: (25 MARKS)
Answer all questions from this section.
It is observed that when a magnet breaks up into two, each of the pieces retains the characteristics of
the original magnet. Explain
(2mks)
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2.
What is the advantage of using a pin hole camera over the ordinary camera?
(1mk)
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3.
State two major defects of a simple cell.
(2mks)
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4.
A girl looks into a plane mirror 3 m in from her and sees the image of the wall which is 2.5m behind
her. What is the difference between the girl’s eyes and the image of the wall?
(2mks)
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5.
Figure 1 shows an object at the bottom of a water container. Draw rays on the diagram to show the
object as viewed from above.
(2mks)
Eye
Trough
Water
Figure 1
Object
6.
A large concave mirror is normally used as a shaving mirror. What makes it suitable for this use?
(1mk)
…………………………………………………………………………………………………………
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7.
In figure 2 power dissipated by the 16Ω resistor is 8w, what is the power dissipated in 200Ω
(3mks)
16 
20
Figure 2
©Butere East Joint Exam 2015
2Physics 232/2
8.
An object is placed 20cm infront of a concave mirror of focal length 10cm and another identical
object is place 20cm infront of a plane mirror
(i) Give one similarity of the image formed.
(1mk)
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(ii) Give one difference between the image formed.
(1mk)
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9.
Figure 3 shows a coil of insulated wire wound on a horse shoe soft iron core AB and connected to a
power supply
A
B
Figure 3
Name the polarity at A.......................................................................
B
10.
.......................................................................
(1mk)
(1mk)
Figure 4 shows a bulb connected across a 6v supply through a resistance wire XY of length 25m
6V
x
6V
B
y
B
Figure 4
Compare and explain the brightness of the bulb if the wire was replaced by one of same material and
same diameter but 50cm long.
(2mks)
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11.
State two application of total internal reflection.
(2mks)
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12.
A soldier standing 110m form a wall blows a whistle and hears an echo sometimes later. If the speed
of sound in air is 33om/s, how long does it take the soldier to hear the echo of the whistle?(2mks)
©Butere East Joint Exam 2015
3Physics 232/2
13.
Figure 5 shows two bar magnets placed with the north poles close together
Figure 5
Sketch the magnetic field pattern between the two north poles.
(2mks)
SECTION B (55MKS)
14.
(a) An experiment was performed in the laboratory in the sequence described
I. Brought a positively charged plastic ruler near to the cap of an uncharged leaf electroscope
II. Touched the cap momentarily with the finger
III. Removed the ruler
Draw diagram to show charge distribution on the cap and leaf of the electroscope and the position of
the leaf after each of the above procedure.
(3mks)
(b) What will be the effect observed if the ruler is removed before removing the finger?
(1mk)
…………………………………………………………………………………………………………
©Butere East Joint Exam 2015
4Physics 232/2
(c) In a separate experiment, the charged plastic ruler was allowed to touch the cap of electroscope.
State giving a reason whether or not there will be any difference in the results obtained in (a) above
(2mks)
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(d) In a nylon manufacturing factory heavy rubber units were put under the spinning machines which
were made of metal to absorb the noise. The following effects were observed
A. Workers sometimes received electric shock when there was no leakage of charge from the main
cable.
B. Small pieces of nylon stuck to the thread but whenever the room was moist this did not occur
(i) State and explain the reasons for the observation in A and B above.(4mks)
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(ii) How would the effect in (d) A be corrected
(1mk)
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15.
(a) State Ohm’s Law.
(1mk)
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(b) Explain why a 12V car battery is able to start the motor car engine while eight dry cells of 1.5 v
each connected in series will not.
(2mks)
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(c) In figure 6the current in the circuit is 1.80A
4Ω
2Ω
2Ω
X
Y
6Ω
(i)
3Ω
Figure 6
Find the effective resistance between X and Y.
(3mks)
…………………………………………………………………………………………………
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(ii)
The p.d of the source.
(2mks)
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©Butere East Joint Exam 2015
5Physics 232/2
(iii)
Current through the 3Ω resistor
(3mks)
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16.
(a) Study the ray diagram in figure 7. The observer should be able to see the reflected image after the
mirror
M2. Show the position of the image
(4mks)
Mirror m1
Object
Figure 7
Mirror m2
(b) A luminous point object took 3 seconds to move uniformly from P to Q in front a pin hole camera
as shown in figure 8
Q
6cm
Transparent
screen
P
40cm
Figure 8
20cm
Determine the speed of the image on the screen in cm/s
(3mks)
(c) A ray of light is incident at an angle of 30o to the mirror positioned along the line M, a shown in
figure 9(a)
0
Figure 9 (a)
©Butere East Joint Exam
m2 2015
m1
6Physics 232/2
By what angle should the mirror be rotated about 0 to the position M2 for the reflected ray to pass along M1
(2mks)
(d)
Figure 9 (b)
Use figure 9(b) to determine the radius of curvature of the convex mirror
17.
(3mks)
The figure 10 shows a transparent water tank containing water. An electric lamp surrounded by a
shield with a narrow slit of fixed at corner A of the tank. A light ray from the slit shines on the water
surface BC, at an angle of 48o as shown.
480
B
Air C
Water
Shield with a
A
slit
Figure 10
Lamb
(a) Determine the angle of refraction for the ray shown.
(3mks)
(b) Complete the ray diagram to show the refracted ray.
(2mks)
©Butere East Joint Exam 2015
7Physics 232/2
18.
(c) Determine the angle of incidence for which the angle of refraction is 90o.
(3mks)
(d) Calculate the speed of light in water.
(3mks)
(a) State and explain a rule you would apply to determine the direction of the magnetic flux round a
conductor carrying an electric current.
(3mks)
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(b) Figure 11 shows a solenoid with a ferromagnetic core connected to a battery E, ammeter A and
rheostat R
Figure 11
E
R
On the figure indicate;
(i)
The direction of current in the external circuit and around the coils.
(1mk)
(ii)
The polarity of the resulting electromagnet
(2mks)
(iii)
The direction of the magnetic field lines created around the solenoid
(2mks)
(c) A conductor through which an electric current is flowing into the paper in a magnetic field as
shown in figure 12
Figure 12
On the same diagram sketch the resulting magnetic field pattern and show the direction of the
resulting mechanical force F, on the conductor
©Butere East Joint Exam 2015
(3mks)
8Physics 232/2