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Physics Question Paper

Physics

Course:Secondary Level

Exam Year:2008

DEDAN'S DAY AND BOARDING HIGH SCHOOL

MOCK OF KCSE

DATE:

TIME:2HRS 30MIN

PHYSICS

INSTRUCTIONS:
1.All questions are compulsory.
2.Read and answer questions carefully.

Q.1.The dipper in a ripple tank has a frequency of 10HZ .30 crests of the waves it generates occupy a distance of 75cm. What is the speed of the waves?
(5 marks)
Q.2.The p.d.across a certain X-ray tube is 20KV.What is the maximum kinetic energy with which the electrons arrive at the target? (5 marks)
Q.3.A radioactive element has a half-life of 3.83 days. A sample of the element has 8000000000 undecayed nuclei at time t=0.
How many nuclei will be left undecayed in the sample after 19.15 days? (5 marks)
Q.4.Explain why it would take longer to cook potatoes at the top of Mount Kenya than at Mombasa. (5 marks)
Q.5.A body of mass 5kg is raised to a height of 1.5 metres . Determine the gain in potential energy of the body.(5 marks)
Q.6.A boy is swimming 10.0m under water at a place where the atmospheric pressure is 65cm of mercury. Calculate the total pressure on his body.
(5 marks)
Q.7.A rectangular block measures 3cm by 5cm by 9cm. Sketch a diagram of the block resting in its most stable state.(5 marks)
Q.8.a)Sketch a ray diagram to show the dispersion of white light after it strike one face of a triangular prism at an angle.(2 marks)
b)The critical angle of a certain glass material is 42.7 degrees. Determine the refractive index of the material.(5 marks)
Q.9.State two applications of photoelectric effects.(2marks)
Q.10.A radiation of wavelength 0.0000004m is shone on a surface of work function 2.8 e V. Determine the maximum kinetic energy of the photoelectrons emitted.(5marks)
Q.11.The bad smell from a rotten substance is more noticeable on a hot day than on a cold morning. Explain this observation in terms of movement of particles. (2 marks)
Q.12. Radiant heat entering through the glass in a greenhouse is unable to escape through the same glass. Explain why.
(5 marks)

Physics Question Paper

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