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Physics Paper Question Paper

Physics Paper

Course:Secondary Level

Exam Year:2011

NJABINI BOYS HIGH SCHOOL

MOCK OF KCSE EXAM

END OF TERW TWO

DATE:19/7/2011

TIME:2HRS 30MIN

PHYSICS

INSTRUCTIONS:
1.All questions are compulsory.
2.Wrong numbering will lead to deductions of marks.

Q.1.A transformer of 600 turns in the primary circuit and 9000 turns in the secondary circuit is connected to a 240 V mains supply.The current in the secondary circuit is 0.15 A.What is the current in the primary circuit?
(5 marks)
Q.2.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.3.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.4.Explain why it would take longer to cook potatoes at the top of Mount Kenya than at Mombasa (2 marks)
Q.5.A body of mass 5kg is raised to a height of 1.5metres.Determine the gain in potential energy of the body.(5 marks)
Q.6.A body is dragged on a surface at a speed of 3.0m/s.If the force of friction against the body is 1200N,determine the power developed by the person dragging the body.(5 marks)
Q.7.A body is swimming 10m under water at a place where the atmospheric pressure is 65cm of mercury.Calculate the total pressure on his body.(5 marks)
Q.8.A rectangular block measures 3cm by cm by 9cm. Sketch a diagram of the block resting in its most stable state.(5 marks)
Q.a)Sketch a ray diagram to show dispersion of white light after it strike one face of a triangular prism at an angle.(5 marks)
b)The critical angle of a certain glass material is 42.7 degrees. Determine the refractive index of the material.(2 marks)
Q.10.a)State two applications of photoelectric effect.
(2 marks)
b)A radiation of wavelength 0.00000004m is shone on a surface of work function 2.8 e V.Determine the maximum kinetic energy of the photoelectrons emitted.
(2 marks)
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.
(2 marks)

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