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Physic Paper Question Paper

Physic Paper

Course:Secondary Level

Exam Year:2011

ST MARYS HIGH SCHOOL

END OF TERM TWO EXAM KCSE MOCK

DATE:5/7/2011

TIME:2HRS 30MIN

PHYSICS

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

Q.1.An object is placed 20cm from a converging lens of focal length 10cm and an image is formed on a screen on the other side of the lens.When a diverging lens is placed halfway between the converging lens and the image,the screen is moved 10cm backwards for a clear image to be formed.Find:
a) the focal length of the diverging lens.
(2marks)
b)the final magnification of the image.(2 marks)
Q.2.A tube of mass 10g,length 10cm and a uniform cross-sectional area of 3cm is partially filled with lead shot. The tube floats vertically in water with 5cm of its length submerged. Find the mass of the lead shot.
(5 marks)
Q.3.10 Coulombs of charge cross a point in 3 minutes. Calculate the current that flows in that time. (5 marks)
Q.4.A certain machine uses an effort of 400N
to raise a load of 600N.If the efficiency of the machine is 75 % ,determine its velocity ratio. (5 marks)
Q.5.A hais drier is rated 2500 W,240V.Determine its resistance.(5 marks)
Q.6.A load of weight 1500 N is raised by rolling it up an inclined plane of height 1.5m and length 3.0m.If the effort applied is 800N,determine:
a)the mechanical advantage of the system. (2 marks)
b)the velocity ratio of the system.(2 marks)
c)the efficiency of the system.(2 marks)
Q.7.A coin is placed at the bottom of a beaker and a transparent liquid added into the beaker to a height of 8cm. By viewing the coin from the top and using an identical coin on the outside of the beaker,the apparent position of the coin in the beaker is found to be 2.1cm from the bottom. Determine the refractive index of the liquid. (5 marks)
Q.8.A signal sent out from an airport is reflected by a distant aeroplane and received on the radar screen 0.002 s later.How far is the aeroplane from the airport. (5 marks)
Q.9.A trolley of mass 1.20kg moving at a speed of 3.0m/s strikes another trolley of mass 800g moving in the same direction. The two stick together and continue moving at a speed of 2.5m/s. Determine:
a)the total momentum before collision.(2 marks)
b)the total momentum after collision.(2 marks)
c)the initial speed of the second trolley.
(2 marks)
Q.10.A metal surface of work function 2.0 eV is illuminated with a radiation of wavelength 0.000000025m.Determine:
a)the maximum kinetic energy of the photoelectrons emitted. (2 marks)
b)the maximum wavelength that would cause photoelectric effect on the surface.
(2 marks)
Q.11.A heater of power of rating,P,is placed in water in a calorimeter and switched on. When the water starts boiling,the heater is left on for 10 minutes before being swtiched off. It is found that 10.5g of water has boiled off. Determine the value of P.
(5 marks)
Q.12.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 0.15A.what is the current in the primary circuit? (5 marks)

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