Post Utme Physics Past Questions and Answers

Question 51:

If \(C\) is the thermal capacity of a material of mass \(m\) and \(S\) is its specific heat capacity, then ____________

A. \(\mathrm{s} / \overline{\mathrm{m}}\)
B. \(\mathrm{S}=\mathrm{Cm}\)
C. \(\mathrm{C}=\mathrm{Sm}\)
D. \(\mathrm{DS}=\mathrm{m} / \mathrm{s}\)

Question 52:

A black car can be more uncomfortably hot on a warm day than a white car because ____________

A. It is B hot on a warm day
B. A black object is a better absorber of heat
C. Black cars have heaters installed in them
D. White cars have air conditioning systems installed in them

Question 53:

A little sag is left in overhead telephone wires ____________

A. Because taut wires do not conduct sound easily
B. To allow for the effect of a rise in temperature due to heating effect of current flowing through them.
C. To allow for the effect of a rise in temperature of the surrounding atmosphere.
D. To allow for the effect of a fall in temperature of the surrounding atmosphere.

Question 54:

A piece of copper wire of length \(100 \mathrm{~cm}\) at \(30^{\circ} \mathrm{C}\) is heated to \(120^{\circ} \mathrm{C}\). If its linear expansivity is \(1.8 \times 10^{-4} / k\), its new length is ____________

A. \(166.6 \mathrm{~cm}\)
B. \(101.6 \mathrm{~cm}\)
C. \(180.6\)
D. \(1.08 \mathrm{~cm}\)

Question 55:

A sample of a monatomic ideal gas is originally at \(20^{\circ} \mathrm{C}\). What is the final temperature of the gas if both the pressure and volume are doubled?

A. \(5^{\circ} \mathrm{C}\)
B. \(80^{\circ} \mathrm{C}\)
C. \(20^{\circ} \mathrm{C}\)
D. \(899^{\circ} \mathrm{C}\)