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# KNEC KCSE Physics Paper 1 Question Paper / 2016 KCSE KAMDARA JET Examination

## KNEC KCSE Physics Paper 1 Question Paper / 2016 KCSE KAMDARA JET Examination

### SECTION A (25 Marks)

1.

The figure below shows a burette partly filled with a liquid. The burette was initially full to
the mark 0. If the quantity of the liquid removed has a mass of 20g, determine the density of
the liquid.

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2 marks

2.

Water at 20o C falls over a waterfall of height 40m. Calculate the temperature of water at the
bottom of the waterfall if 80% of potential energy at the top is converted into heat energy.
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3 marks

3.

A faulty thermometer reads 2o C when dipped in ice a 0oC and 95o C when dipped in steam at 100o C. what would this thermometer red if placed in water at room temperature of 18o C?
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3 marks

4.

Xcm3 of substance A which has density 800 kg/m3 is mixed with 1000cm3 of water with a
density of 1000kg/m3. The density of the mixture is 960kg/m3 . Determine the value of X.
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3 marks

5.

The figure below shows a simple instrument designed by a student for weighing objects.

a) State what happens if one places an item on the weighing pan. (1 mark)
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b) State two properties of water that make it suitable for this purpose. (2 marks)
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3 marks

6.

The figure below shows an arrangement of demonstrate diffusion through solids.

The hydrogen gas is supplied for sometimes then stopped and the beaker removed. State and
explain what is likely t be observed when the hydrogen gas supply is stopped.
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3 marks

7.

A metal pin was observed to float in the surface of pure water. However, the pin sank when
drops of soap solution were carefully added to water. Explain this observation.
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1 marks

8.

Sauce pans have a plastic or wooden handles. It is observed that in the morning the pan feels
colder than the wooden handle. Explain the difference in this observation.
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2 marks

9.

A bullet moving at a velocity of 350m/s hits a tree trunk of diameter 70cm. It emerge from the
opposite side with a velocity of 180m/s. Determine the average deceleration of the bullet in
the trunk.
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3 marks

10.

The figure below shows a container with small holes at the bottom in which wet clothes have
been put. When the container is whirled in air at high speed, it is observed that the clothes dry
faster.
Explain how the rotation of the container causes the clothes to dry why so fast.
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2 marks

### SECTION B (55 Marks)

11.

The table below shows the value of the resultant force F and time t for a bullet raveling inside
the gun barrel after the trigger is pulled.

 Force F (N) 360 340 300 240 170 110 Times t (ms) 3 4 8 12 17 22

(a) On the grid provided plot a graph of force F against time t. (5 marks)
(b) Determine from the graph:
(i) The time required for the bullet to travel the length of the barrel assuming that the force
becomes zero just at the end of the barrel. (1 mark)
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(ii) Impulse of the force. (2 marks)
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(c) Given that the bullet emerges from the muzzle of the gun with a velocity of 200m/s,
Calculate the mass of the bullet. (3marks)
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10 marks

12.

a) State the pressure law. (1 mark)
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b) The pressure (P) of a fixed mass of a gas at constant temperature T=300k is varied
continuously. The corresponding values of P and volume (v) of the gas are shown below.

 Pressure (x105 Pa) 2 2.5 3 3.5 4 4.5 Volume (m3) 0.025 0.02 0.017 0.014 0.012 0.011

( i) Plot a graph of P against 1/v using grid provided below. (5 marks)
(ii) Given that P = 2RT/V , Find the constant R from the graph. (2marks)
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(c) A tin with an air tight lid contains air at a pressure of 1.0 x 105 Pa and a temperature of 120C.
The air is heated in water bath until the lid opens. If the temperature at which the lid opens is
88oC, Determine the pressure attained by the gas. (3marks)
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10 marks

13.

(a) State Archimedes Principle (1 mark)
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(b) The figure below shows a block of mass 50g and density 2000kg/m3 submerged in a certain
liquid and suspended from uniform horizontal beam by means of a string. A mass of 40g
suspended from the other end of the beam puts the system in equilibrium

(i) Determine the up-thrust force acting on the block. (3 marks)
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(ii) Calculate the density of the liquid. (3 marks)
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(iii) Calculate the new balance point of the 50g mass (the 40g mass remains fixed) if the liquid
was replace with one whose density was 1500kg/m3. (3 marks)
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10 marks

14.

a) A liquid at 80o C in a cup was allowed to cool for 20 minutes. State two factors that
determine the final temperature. (2 marks)
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b) What is meant by specific latent heat of evaporation? (1 mark)
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c) In an experiment to determine the specific latent heat of vaporization L of water, steam at
100oC was passed into water contained in a well lagged copper calorimeter. The following
Mass of calorimeter = 80g
Initial mass of water = 70g
Initial temperature of water = 5o C
Final mass of calorimeter + water + condensed steam = 156g
Final temperature of mixture = 30oC
(Specific heat capacity of water = 4200JKg-1k-1 and specific heat capacity for copper =
390J/kg/k).

Determine:
i) Mass of condensed steam. (2 marks)
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(ii) Heat gained by the calorimeter and water. (2 marks)
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(iii) Given that L. is the specific latent host of vaporization of steam.
a) Write an expression for the heat given out by steam. (1 mark)
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b) Determine the value of L. (3marks)
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10 marks

15.

a) Distinguish between load and effort. (2 marks)
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(b) A mason uses a six wheel pulley system to raise a weight of 250N through a vertical height
of 2.5m using the machine. If the mason pulls using an effort of 500N. Calculate:
i) The velocity ratio of the pulley system. (2 marks)
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ii) The work done by the mason. (3 marks)
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( iii) The useful work done by the pulley system. (2 marks)
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iv) The efficiency of the system (3marks)
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10 marks

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