Which of the following devices convert heat energy to electrical energy?

• A. transformer
• B. dynamo
• C. thermocouple
• D. thermostat

Light is considered as a transverse wave because it travels

• A. through material without causing disturbance of the medium
• B. through space with constant speed
• C. in a direction parallel to the plane containing the electric and magnetic fields
• D. in a direction perpendicular to the plane containing the electric and magnetic fields

An object of mass 0.25kg moves at a height h above the ground with a speed of 4ms^-1, if its mechanical energy at this height is 12 J, determine the value of h. [g = 10ms^-1]

• A. 0.8m
• B. 4.0m
• C. 4.8m
• D. 5.6m

Water of mass 1.5kg is heated from from 30^oC to 80^oC using an electric kettle which is rated 5A, 230V. Calculate the time taken to reach the final destination [specific heat capacity of water 4200Jkg^-1K^-1]

• A. 4.57 minutes
• B. 5.02 minutes
• C. 7.30 minutes
• D. 10.04 minutes

Use the diagram to answer question;

Camphor is a chemical that sub-limes and interacts with water reducing the surface tension where it is put. Explain why the toy boat illustrated above would move forward with the camphor placed at the back of it but would be stationary before the placement of the camphor.

Which of the following equations for the efficiency of a machine is correct?

• A. Efficiency = \(\frac{\text{Velocity Ratio}}{\text{Mechanical Advantage}}\) x 100%
• B. Efficiency = \(\frac{input}{output}\) x 100%
• C. Efficiency = \(\frac{\text{load distance}}{\text{effort distance}}\) x 100%
• D. Efficiency = \(\frac{\text{Mechanical Advantage}}{\text{Velocity Ratio}}\) x 100%

In an electrolysis experiment, the ammeter records a steady current of 1 A. The mass of copper deposited in 30 minutes is 0.66 g. Calculate the error in the ammeter reading. [ Electrochemical equivalent of copper = 0.00033 g C\(^{-1}\)]

A metal rod of length 50cm is heated from 40^oC to 80^oC. If the linear expansivity of the material is \(\alpha\), calculate the increase in length of the rod (in metres) in terms of \(\alpha\)

• A. 20\(\alpha\)
• B. 200\(\alpha\)
• C. 2000\(\alpha\)
• D. 20000\(\alpha\)

Which of the following actions will not increase the sensitivity of a moving coil galvanometer?

• A. using a strong temporary magnet
• B. increasing the area and number of turns of the coil
• C. using a week hair spring
• D. using a light pointer

The diagram below represents the displacement-time graph of the motion of an object thrown upwards. The velocity of the object at the point P is

• A. maximum
• B. uniform
• C. zero
• D. terminal