School:…………………………………………………………….. Sign.:
………………………
Date:………………………………………...
Kenya Certificate of Secondary Education (
K.C.S.E )
232/1
PHYSICS
PAPER 1
(THEORY)
JULY/AUGUST
TIME: 2 HOURS
SCHOOL BASED ASSESSMENT EXAM A
FORM
4
PHYSICS
PAPER 1
INSTRUCTIONS TO
CANDIDATES:
·
Write your name, admission number
and the name of your school in
spaces provided above.
·
Sign and write the date of examination in the spaces
provided above.
·
This paper consists of sections: A and B.
·
Answer all the questions in section A and B in the spaces provided below
each question.
·
All
working must
be clearly shown in the spaces provided.
·
Mathematics tables and silent
electronic calculators may be used.
·
Take gravitational acceleration =
10 m/s2.
FOR
EXAMINER’S USE ONLY
SECTION
|
QUESTION
|
MAXIMUM
SCORE
|
CANDIDATE’S
SCORE
|
A
|
1 – 11
|
25
|
|
B
|
12
|
9
|
|
13
|
9
|
||
14
|
9
|
||
15
|
9
|
||
16
|
9
|
||
17
|
10
|
||
TOTAL SCORE
|
80
|
||
This
paper consists of 8 printed pages.
Candidates
should check to ascertain that all pages are printed as indicated
and that no questions are missing.
SECTION A: (25MARKS)
Answer ALL questions in this section.
1.
The diagram below shows a portion of a
micrometer screw gauge used to measure the diameter of a meter pipe. The reading on the gauge when the jaws were
fully closed without the pipe was 0.012cm.
What is the length of the pipe? (2marks)
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2.
Name two forces that determine the
shape of a liquid drop on a solid surface. (2marks)
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3.
A uniform rod of length 4m and mass of 4kg
is pivoted at 3.6m mark. The rod is held
horizontal with a vertical rope at the 4m mark, as shown in figure below.
Calculate the
tension, T in the rope (2marks)
(Take g = 10N/kg)
4.
The diagram below shows two similar cups
of tea containing equal volumes of hot tea at the same level. It was observed that the rate of cooling was
the same in the two cups. Explain. (2marks)
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5.
Figure below shows water flowing through
two sections A and B of a pipe having x-sectional areas of 8cm2 and 2cm2, respectively.
i) Mark the appropriate level of water in the manometer B (1mark)
ii) The velocity of water
as it flows past the wider section of the pipe is 0.6ms-1.
Calculate the velocity
at the narrower section. (2marks)
6.
An electric motor raises a 60kg mass at a
constant velocity. Calculate the power
of the motor if it takes 30 second to raise the mass through a height of
25m. (Take g = 10N/kg) (2marks)
7.
Figure below shows a clinical thermometer
which is not graduated.
a) Name the parts indicated
with letters: A and B. (1mark)
A: .......................................................................
B:
.......................................................................
b) Mark the appropriate
scale range in degrees Celsius. (1mark)
8.
Figure below shows dots which were made by
a ticker timer-tape attached to a trolley.
If the frequency used was 50Hz, determine
a) The velocities between
AB and BC. (2marks)
b) The deceleration of the
trolley. (2marks)
9.
The figure below is diagram of a manometer
used to determine the density of a liquid.
Given that the density of liquid B is 2000kg/m3, determine the density
of the liquid A in SI units. (3marks)
10. Two springs of negligible weights and
spring constants 50N/m and 75N/m respectively are connected in series and suspended from a fixed point. Determine the total extension when a mass of
7.5kg is hung from the lower
end. (3marks)
SECTION B: (55 MARKS)
Answer all questions in this section in the spaces provided.
11. a) A rifle of mass 4.0kg fires a bullet of mass
12.0g with a muzzle velocity of 700ms-1. Assuming that the rifle
is free to move. Find the velocity of
recoil. (3marks)
b) Figure below shows a cross-section of a
handle of a screw jack 70cm long. The
pitch of the screw is 0.8cm.
Given that the efficiency is 65%, calculate:
i) The velocity ratio of
the system. (2marks)
ii) The mechanical
advantage of the screw jack. (2marks)
c) Sketch a graph of efficiency against Load (1mark)
d) Draw a single moving pulley with a velocity
ratio of 2. (2marks)
12. a)
Define latent heat of vaporization. (1mark)
..................................................................................................................................................................
..................................................................................................................................................................
b) Figure
below shows a set up by a student to determine the specific latent heat of vaporization
of a liquid.
i) Identify the parts
labelled X and Y (2marks)
X:
...................................................................................
Y:
....................................................................................
ii) State the measurements
that should be taken. (2marks)
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..................................................................................................................................................................
iii) Describe how the set
up can be used to determine the specific latent heat of vaporization of the liquid. (4marks)
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iv) What is the purpose of
the condenser? (1mark)
..................................................................................................................................................................
..................................................................................................................................................................
13. a) Define Pressure Law. (1mark)
..................................................................................................................................................................
..................................................................................................................................................................
b)
State one basic assumption of the kinetic theory of gases. (1mark)
..................................................................................................................................................................
..................................................................................................................................................................
c)
Figure below shows a set up that may be used to verify Pressure
Law.
i.
State the measurements that may be taken in the experiment. (2marks)
..................................................................................................................................................................
..................................................................................................................................................................
ii.
Explain how the measurement in (i) above may be used to verify
Pressure Law. (4marks)
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..................................................................................................................................................................
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..................................................................................................................................................................
iii.
A car tyre is at an air pressure of 4.0 x 105 Pa at a temperature of 270C. While it is running the temperature rises to
750C. What is the new pressure in the tyre? (Assume the tyre does not expand) (3marks)
14. a) i)
State Archimedes’s Principle. (1mark)
..................................................................................................................................................................
..................................................................................................................................................................
ii) An object weighs 1.04N
in air, 0.64N when fully immersed in water and 0.72N when fully immersed in a liquid. If the density of water is 1000kgm-3, find
the density of the liquid (3marks)
b)
i) State the law of floatation. (1mark)
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ii)
Give a reason why a steel rod sinks in water while a ship made of steel
floats on water. (1mark)
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..................................................................................................................................................................
iii) The figure below shows a diagram of a
hydrometer which is suitable for measuring the densities of liquids varying between 1.0 and
1.2gcm-1.
On the diagram
indicate the label corresponding to 1.0 and 1.2g/cm3. (2marks)
iv) Figure below shows
a buoy, B, of volume 40 litres and mass 10kg.
It is held in position in sea water
of density 1.04gcm-3 by a light cable fixed to the bottom so that 3/4 of the volume of the buoy is below the surface of the sea water. Determine the tension T in the cable. (3marks)
15. a) In an experiment to investigate the
relationship between centripetal force (F) and angular velocity (w) for a body of mass 2kg moved in a circle of diameter 120cm, the
graph below was drawn.
Determine the linear velocity when the centripetal force is
5N. (3marks)
b) i) The
figure below shows a ball being whirled in a clockwise direction in a vertical
plane. Sketch on the figure the path followed by the ball
if the strings cuts when the ball is at position A. (1mark)
ii) A body having
uniform motion in a circular path is always accelerating. Explain. (1mark)
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..................................................................................................................................................................
c) The figure below shows a trolley moving on a
circular rail in a vertical plane. Given
that the mass of the trolley is 250g and the radius of the rail is 1.5m.
i) Determine the minimum velocity at which
trolley passes point X. (3marks)
ii) If the trolley moves with a velocity of 4m/s
as it passes point Z. Find;
I) Angular velocity at this point. (3marks)
II) The force exerted on the rails at this point. (2marks)
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