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Volume Vii National Mock / Post Mock Examination Physics P1 Question Paper
Volume Vii National Mock / Post Mock Examination Physics P1
Course:Secondary Level
Institution: Kcse question papers
Exam Year:2010
Take:
Density of water = 1.0 x 103 Kg m-3. Acceleration due to gravity = 10ms-2.
1. Figure 1 below shows part of a micrometer screw gauge that is a micrometer screw gauge that is being used to determine the diameter of a wire.
State the diameter of the wire. (1 mk)
2. Okinda claps his hands at 0.5 seconds intervals infront of a cliff 180m away. He realised that each echo produced by the cliff coincides with the next clap. Use this information to calculate the speed of sound in air. (2mks)
3. A small light table tennis ball is suspended by a silk thread. A charged ebonate rod is brought close to it. The ball is first attracted to the rod, but after touching it, it is repelled. Explain. (2mks)
4. The sketch in figure 2 below shows the cooling curve of a substance.
Which portion of the curve shows the melting point of the substance? ( 1mk)
5.
The uniform beam above weighs 1KN. How much further can a man weighing 800N move to the left before the beam tips over? (2 mks)
6. A boy of weight 600N displaces 50 litres of water when dunking. What volume of water must he swallow while floating in order to make him just sink? ( 3mks)
7. Figure 4 below shows drops of water and mercury on a clean glass surface.
Explain the difference in the shapes. ( 2mks)
8. A glass block measures 5cm by 5cm by 8cm. When it is resting on its smallest face and it is viewed from above, it appears to be a cube. What is the refractive index of the glass? (2mks)
9. Distinguish between thermionic emission and photoelectric effect. (2mks)
10. Complete the ray diagram below to show the position of the image. (2 mks)
? ? ? ? Fig 5.
C1 O F1 F2 C2
11 State three reasons why any transformer is not perfect. (3mks)
12. Find the effective capacitance of the net below. (3 mks)
Fig 6.
40pF 20pF
80pF
13. Why is the inside of an X – Ray Tube highly evacuated? ( 1mk)
14. Calculate the fuse rating of an electrical appliance rated 2KW, 250V. ( 2mks)
15. Explain what makes a bubble of air rising from the bottom of a pond to increase in size as it rises. (2 mks)
16. A bullet of mass 20g is fired from a gun of mass 6 kg at 500 m/s. What is the recoil velocity of the gun? ( 3mks)
17. The end A of a uniform bar of metal is heated gently while its remaining length is exposed to air. On the axes below, sketch its temperature gradient. ( 1mk)
Temp. Fig.7
Distance from A.
18. A string with a fundamental frequency of 400 Hz is stretched so that its tension is doubled. Calculate its new frequency. ( 3mks)
19. Estimate the diameter of an oil molecule if a drop of it, of volume 4.0 x 10-6 m3 forms a patch of diameter 14 cm on a water surface. ( 3mks)
20. State two industrial uses of gamma rays. ( 2mks)
21 A wire is placed between two magnetic poles as shown below.
S I N Fig.8
In which direction will the wire move? (1mk)
22. Calculate the change in length of a metal 2m long at 200 C if it is heated to a temperature of 700 C given that its coefficient of linear expansivity is 1.0x 10-5 mk-1. (3mks)
23. State one way by which a bicycle rider can increase the brightness of his headlamp. (1mk)
24. A lady's dress appears white with blue stipes when viewed in blue light. Describe the actual colours of her dress. (2mks).
25. How much water at 300 C is required to make 5kg of water at 700 C to be at 370 C? (3mks)
26. Identify the transistor below. (1mk)
Fig.9
27. Calculate the root mean square voltage of a source which has a peak voltage of 240V. (2mks)
28. The paper ball below is falling freely through air and a slight wind is blowing it from left to right. Indicate all the forces acting on it. ( 3mks)
Fig.10
29. Some students tried to grow a large crystal of copper sulphate by suspending a small copper sulphate crystal in a super-saturated solution of copper sulphate. Why did they use a super-saturated solution? ( 1mk)
30 State two uses of optical fibres. ( 2mks)
31. Why can’t alternating current be used for recharging a car battery? (1mk)
32. You are given an alcohol thermometer and a mercury thermometer. State, with a reason, which one you would use for measuring temperatures: (4mks)
(a) below 10oC (b) above 120oC
33. What conditions are necessary for a conductor to obey ohm’s Law? (2mks)
34. Complete the ray diagram below to show how the eye, E sees the image of the point object, O formed in the plane mirror. (2mks)
O •
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