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Physics Question Paper

Physics

Course:Secondary Level

Exam Year:2012

NYAHURURU BOYS HIGH SCHOOL

KCSE MOCK

TERM TWO

DATE:8/7/012

TIME:2HRS 30MIN

INSTRUCTIONS:
~All questions are compulsory.
~Read and answer questions accordingly.

Q.1. A tree 15m high is 36m away from the window of laboratory. A student observing the image of the tree in a pinhole camera held next to the window measures the height of the image of the tree and finds it to be 10cm.What is the length of the box of the pinhole camera? (5 marks)
Q.2. Two mirrored walls stands at an angle to each other.A student standing in the room counts nine images of himself in the mirrors.Determine the angle between the walls. (5 marks)
Q.3. Define the term refractive index of a substance. (2 marks)
Q.4.State the laws of refraction. (2 marks)
Q.5.State the necessary conditions for total internal reflection to take place.(2 marks)
Q.6.Give two applications of total reflection.(2 marks)
Q.7.A narrow beam of monochromatic light in air is incident on a plane boundary between air and glass such that the angle between the beam and the boundary is 30 degree celsus.
If the refractive index of the glass is 1.5,through what angle will the beam be bent on refraction? (5 marks)
Q.6.Explain what is meant the term 'critical angle' (2 marks)
Q.7.A diamond block has a refractive index of 2.4.What is its critical angle?( 2 marks)
Q.8.A pin is placed close to one face of a rectangular block of glass and is viewed normally through the opposite face.If the block is 27cm long,How far will the pin appear to be from the front face of the block,given that the material of the block has a refractive index of 1.5? (5 marks)
Q.9.The velocity of light in air is 0.00000003 m and the refractive index of glass is 1.5.
Calculate the velocity of the light in the glass.
(5 marks)
Q.10.Using a ray diagram,show how short sightenedness in the human eye can be corrected.(5 marks)
Q.11.The lens of a camera has a focal length of 6cm.How far must it be placed from the film when taking the photograph of an object which is 15cm away,for one to get a sharp image? (5 marks)
Q.12.An object 1cm high is placed 2cm in front of a concave lens of focal length 4cm.Find the position and the nature of the image. (2 marks)

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