Post Utme University of Calabar Physics Past Questions and Answers

Question 1:

In a harmonic oscillation of a simple pendulum, one of the following statements is correct

A. The potential energy and the kinetic energy of the bob are equal at all times
B. The potential energy is equal to the kinetic energy at the central position of the oscillation
C. The potential and the kinetic energies of the bob are maximum at the maximum height of the oscillation
D. None of the above

Question 2:

If the linear expansivity of a metal rod is \(4 \times 10^{-5}\) per \({ }^{\circ} C\), what will be the new length of the rod if it is heated from \(15^{\circ} C\) to \(95^{\circ} C\) from its original length of \(20 cm\)

A. \(0.064 cm\)
B. \(0.64 cm\)
C. \(20.64 cm\)
D. \(20.064 cm\)

Question 3:

The heat required to melt ice at \(0^{\circ} C\) to water at the same temperature is called ____________

A. Apparent heat of fusion
B. Apparent heat of vaporization
C. Latent heat of vaporization
D. Latent heat of fusion

Question 4:

Which of the following is used in a nuclear reactor to slow down fast moving electrons?

A. Carbon dioxide gas
B. Liquid sodium metal
C. Concrete shield
D. Graphite rods.

Question 5:

Calculate the power-rating of a heating element which melted in \(20 g\) of ice at \(0^{\circ} C\). and raised the temperature of the resulting water to \(60^{\circ} C\) in 2 minutes Specific latent heat of fusion of ice \(=340 V / g\) Specific heat capacity of water \(=4.2 J / 9^{\circ} C\)

A. \(5.92 kw\)
B. \(98.6 w\)
C. \(107 w\)
D. \(42 w\)