PHYSICS TRIAL QUESTIONS
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1.Define density and relative density.
B.Give two functions of thermometer and a micro Metre screw Guage.
B.Give two functions of thermometer and a micro Metre screw Guage.
2.what is energy?
B.Explain how a transistor behaves.
B.Explain how a transistor behaves.
3.what is inertia?
B.Give three partial example of inertia.
B.Give three partial example of inertia.
4.Explain Centre of gravity of a body.
B.Name the states of equilibrium of a body.
B.Name the states of equilibrium of a body.
5.Define refraction of light ?
B.state two laws of refraction of light .
B.state two laws of refraction of light .
6.What is heat?
B.state three effects of heat.
B.state three effects of heat.
7.Name two thermometers you know.
B.State four advantages of mercury.
B.State four advantages of mercury.
8.What is thermostat?
B.Explain how a thermostat behaves.
B.Explain how a thermostat behaves.
9a.How are cathode rays produced?
b.State two properties of cathode rays.
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10. A stationary siren emits a note of frequency 356Hz. If a train approaches the siren at a constant speed of 54m/s,determine the frequency of the note that will be received by a passenger inside the train. [Speed of sound in air=340m/s]
b.State two properties of cathode rays.
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10. A stationary siren emits a note of frequency 356Hz. If a train approaches the siren at a constant speed of 54m/s,determine the frequency of the note that will be received by a passenger inside the train. [Speed of sound in air=340m/s]
11. a) i. What is stationary wave?
ii. Define amplitude and use it to differentiate between the node and antinode.
b. List the factors on which the frequency of vibration in a stretched string depends.
c) A wire of length 0.5m and mass 5.0×10-3kg is stretched under a tension, T=54N. Calculate the wavelentgh of the sound emitted when the wire is plucked and released. speed of sound in air 340m/s
ii. Define amplitude and use it to differentiate between the node and antinode.
b. List the factors on which the frequency of vibration in a stretched string depends.
c) A wire of length 0.5m and mass 5.0×10-3kg is stretched under a tension, T=54N. Calculate the wavelentgh of the sound emitted when the wire is plucked and released. speed of sound in air 340m/s
12. a i) What is weight?
ii) Explain why a body falling freely experience weightlessness.
b).i. Define elastic collision.
ii) A stone of mass 4.0g moving with a velocity of 6m/s undergoes elastic collision with a
stationary body of mass 8g. Calculate the velocity of the bodies after the collision.
ii) Explain why a body falling freely experience weightlessness.
b).i. Define elastic collision.
ii) A stone of mass 4.0g moving with a velocity of 6m/s undergoes elastic collision with a
stationary body of mass 8g. Calculate the velocity of the bodies after the collision.
13. a i. state the law of conservation of energy.
ii.A block and tackle system has 4 pulleys in the middle fixed block and 3 pulleys in the lower movable block. If the efficiency of the machine is 35% calculate the load that will be raised by an effort of 200N.
b. i. Define latent heat of fusion of a substance
ii. give two conditions for the formation of dew.
c. heat is applied to 0.5kg of ice initially at a temperature of 0°C to change it to water at 5°C. calculate the heat supplied. (Specific latent haet of ice=3.36×105 Jkg/1
specific heat capacity of water=4.2×103 Jkg/1K/1
ii.A block and tackle system has 4 pulleys in the middle fixed block and 3 pulleys in the lower movable block. If the efficiency of the machine is 35% calculate the load that will be raised by an effort of 200N.
b. i. Define latent heat of fusion of a substance
ii. give two conditions for the formation of dew.
c. heat is applied to 0.5kg of ice initially at a temperature of 0°C to change it to water at 5°C. calculate the heat supplied. (Specific latent haet of ice=3.36×105 Jkg/1
specific heat capacity of water=4.2×103 Jkg/1K/1
14. a. state and illustrate Kirchhoff's law of electrical network.
b.With the aid of a diagram,explain the operation of a simple electric motor.
c. Calculate the peak value of a 250 mains.
b.With the aid of a diagram,explain the operation of a simple electric motor.
c. Calculate the peak value of a 250 mains.
15.a). Define the ff:
i. work function
ii. threshold frequency
b. With the aid of a diagram describe the essential features of a
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i. work function
ii. threshold frequency
b. With the aid of a diagram describe the essential features of a
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