NAME...... ADM NO...... CLASS......
KCSE ONLINE REVISION
TERM 1 END OF TERM EXAM 2014
PHYSICS FORM 3
ATTEMPT ALL QUESTIONS IN THE SPACES PROVIDED
- a) A top pan balance reads 30.5g when an empty beaker is palced on it. 50ml alcohol of density 0.8g/cm3 was added into the beaker. What would be the new reading of the top pan balance? (2mks)
b) i) What is surface tension.(1mk)
......
ii) A funnel is placed in soap solution as shown below
Explain what happens to the soap bubble when the funnel is removed from soap solution. (2mks)
......
c. The diagram below shows a smoke cell.
i) Explain the observation.(2mks)
......
......
ii)Explain what would happen if the temperature of the smoke cell is lowered.(2mks)
......
d) The figure below shows two mirrors inclined at an angle of 600. Complete the path of the ray after reflection from the mirror indicating the angles. (2mks)
e) A girl shouts and hears an echo after 0.6 seconds later from a cliff. If velocity of sound is 330m/s. Calculate the distance between her and the cliff. (3mks)
f) A micrometer screw gauge has zero error of -0.019cm.
Determine the true reading of the instrument.(2mks)
g) A single light spring has sprung constant of 0.2N/cm. The diagrm below shows arrangement of three identical springs.
Calculate the total extension of the system.(3mks)
h) The figure below shows an object and its image formed by a concave mirror. Locate the position of principle focus. (2mks)
i) A broadcasting station send radio wave of wavelength 15000cm at a frequency of 200kHz. Calculate the velocity of radio waves. (2mks)
- a) Differentiate between streamline flow and turbulent flow.(2mks)
......
b) What do you understand by the term critical velocity?(1mk)
......
c) With the aid of a diagram of aerofoil,Explain briefly how dynamic lift occurs to a plane taking off from the runway. (3mks)
d) A liquid flows along a horizontal pipe of cross-section area 24cm2 with a speed of 3m/s. The speed increases to 9m/s where there is construction. Calculate the cross section area of the construction. (3mks)
e) Water flows in a pipe of length 0.30M and of uniform cross section area 15cm2 in 3 seconds. Calculate the rate of flow of water in cubic metres per second. (3mks)
State three Bernoullis effect.(3mks)
......
......
- a) The graph below shows displacement-time graph for a sports car.
Describe the way the vehicle is moving.(2mks)
......
ii) Draw the velocity-time graph for the above motion.(2mks)
b) Shown below is a section of ticker tape made by a timer operating at 50Hz. Determine the acceleration between section marked x and y. (5mks)
c) A body is moving with uniform acceleration its velocity after 5 seconds is 26m/s and after 9 seconds it is 42m/s. Calculate.
i) Acceleration(2mks)
ii) Initial velocity(2mks)
iii) Displacement during this period.(3mks)
- a) What is meant by the terms;
i) Refraction index(1mk)
......
ii) Critical angle(1mk)
......
iii) Monochromatic light(1mk)
......
b) State the laws of refraction.(2mks)
......
......
......
c) In a transparent liquid container an air bubble appears to be 12cm when viewed from one side and 18cm when viewed from the other side as shown below. What is exact position of the bubble from side A if the container is 40cm wide? (3mks)
d) A pool of clean water appears shallower than the real depth whereas the star appears further away than really is. Explain. (2mks)
......
......
e) State two conditions necessary for total internal reflection to occur.(2mks)
......
......
f) Complete the ray diagram for the path of light PQ as it outers a prism of refractive index 1.50. (3mks)
g) A ray of light incident on a face of a pace of a semicircular prism. Determine the refractive index of the prism. (3mks)
h) Give two reasons why a prism is preferred to place mirror as reflecting surface.(2mks)
......
......
i) The angle of incidence for a ray light passing from air to water is 300 and the angle of refraction in water is 220. Calculate the speed of light in water if the speed of light in air is 3x108m/s. (3mks)
j) Draw a diagram showing dispension of white light by a prism indicating the most and least refracted colour of light. (2mks)
1