Wednesday 25 March 2020

COVID-19 end of Form two revision paper




SECTION A ( 25 marks) 

1. State the reading in seconds indicated on the digital stopwatch shown in the figure below .

(1 mark)

2. Mechanics is one of the branches of physics. State what it deals with. (1 mark)


3. State principle of transmission of fluids (1 mark)

4. The figure below shows a manometer connected to a gas supply.
The atmospheric pressure is 76cmhg. Calculate the pressure of the gas in mmhg.(2 marks) 

5. The figure blow shows a patient standing in front of a mirror.

Find the distance between her and the image of the chart.

6. Explain why soft iron cannot be used to make permanent magnets. (1mark)

7. A coil of insulated wire is wound around a soft iron core XY and connected to a battery as shown in the figure below.


State the polarities of ends X and Y.

X………………………………………….Y …………………………………(1mark)


8. Define the Centre of gravity of a body. ( 1mark)

9. The figure below shows a tractor used in a rough road
   State with a reason the point among ABCD at which the COG will be safest. (2marks) 
10. State two practical applications of stability. (2 marks)

11. Define Principal focus of a concave mirror. ( 1mark)

12. A uniform one metre rod is balanced on a knife edge by a force of 50N placed 10cm from one end shown in the figure below.
Determine the weight of the rod. (3 marks)

13. A concave mirror of focal length 15cm has an object on its axis 20cm away from the mirror. If the object is 1cm high, detrmine by scale drawing;

(a) The image distance from the mirror (3marks)
(b) The size of the object (2marks)

14. The diagram below shows sound waves passing through air. Study it and answer the questions that follow.  


Label the following on the diagram: (3 marks) 
i. Compression
ii. Rarefaction
iii Wavelength 
   

SECTION B 

15. (i) State Hooke’s law ( 1 mark)
(ii) The graph below represents relationship between extension (cm) and weight (N) suspended on a spring
(b) State with a reason which point shows the elastic limit of the spring . (2 marks) 
( c) Determine the spring constant of the spring (3 marks)
(d) State two factors that affect the spring constant of a spring. (2 marks)
(e) State and explain the observation made on the extension of the spring when a weight of 5N is suspended on the spring and then removed. (2 marks)
(f) A single spring extends by 4.8 cm when supporting a load of 144 N. Find the extension of the arrangement below if the springs are identical and of negligible weight. (3 marks)


16. A small electromagnet, used for lifting and then releasing a small ball, is made in the laboratory as shown in the figure below.
(a) Explain why an iron nail is better material than steel to use for the core. ( 1 mark)

(b) In order to lift a slightly larger ball, it is necessary to make a stronger electromagnet.  State two ways in which the electromagnet could be made powerful. ( 2marks)

(c) Figure below shows a simple electric device
(i) Identify the device (1 mark)
(ii) Name the parts labeled (2 marks)
 A...........................   B................................

(iii) When the switch is closed, the hammer hits the gong repeatedly.

Explain why.

I. The hammer hits the gong ( 2 mark)

II. The hammer hits the gong repeatedly ( 2 mark)

17. (a) State one difference between the way sound waves and electromagnetic waves are transmitted. ( 1 mark
(b) Figure below shows a transverse wave travelling along x-axis.

    

(b) Figure below shows a transverse wave travelling along x-axis.
(i) Determine the:

      I. Wavelength of the wave (1 1mark)
      I. Amplitude of the wave ( 1 mark)

(ii) If the time taken by the wave to move from O to A is 0.02 seconds, determine the:
     I. Frequency of the wave (3 marks)
     II. Speed of the wave (3 marks)

(iii) A girl standing 600 m away from a cliff bangs two pieces of wood together and hears an echo 3.5 seconds later. Determine the speed of sound in air at that place. (3 marks)

18. The figure 8 below shows an experimental set up for estimating the diameter of an oil molecule.
a) Describe how the oil patch is formed (3 Marks)

i)In this experiment the diameter ‘d’ of the oil patch was measured to be 21cm for an oil drop of radius 0.28mm. Determine the diameter of the oil molecule. (3 marks)


ii) State any two assumptions made in calculating the diameter of the oil molecule. (2 Marks)

b) Identify powder A and states its role in the experiment. (2 Marks)



19 . (a) State and explain two types of fluid flow (2 marks)
(b ) State two assumptions made in deriving the equation of the continuity (2 marks)
(c) The figure below shows a tube of varying cross- section area. represent the speed of water as it flows steadily through the sections of the tube
        

Arrange the speeds in decreasing order starting with the highest. (1 mark)

(d) A pipe of radius 6mm is connected to another pipe of radius 9mm. If water flows in the wider pipe at the speed of 2ms-1, Calculate is the speed in the narrower pipe. ( 3 marks)

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