Physics 2017 Past Questions

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A plane is inclined at an angle \(\theta\) to the horizontal. Its velocity ratio is

A. \(sin\theta\)
B. \(tan\theta\)
C. \(\frac{1}{sin\theta}\)
D. \(\frac{1}{tan\theta}\)

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The diagram above illustrates a beaker of water being heated. It is observed that as the bubbles rise they get bigger in size.The reason for this observation is

A. water pressure on the bubbles decreases
B. density of water increases with rise in temperature
C. volume of water increases with rise in temperature
D. atmospheric pressure on the bubbles decreases

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Which of the following devices converts light energy to electrical energy?

A. Bulb
B. Television
C. Solar cell
D. Light emitting diode (LED)

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A motor of a corn mill machine operates on electrical energy of \(1.44 \times 10^{5}\)J. If one-quarter of the energy is wasted on sound and heat, determine the efficiency of the machine.