Post Utme Physics Past Questions and Answers

Question 76:

An object is placed \(15 \mathrm{~cm}\) in front of a concave mirror of radius \(40 \mathrm{~cm}\). The image formed is ____________

A. Virtual and \(60 \mathrm{~cm}\) behind the mirror
B. Real and \(60 \mathrm{~cm}\) in front of the mirror
C. Virtual and \(40 \mathrm{~cm}\) from the mirror
D. At infinity

Question 77:

Heat supplied or removed from a system which causes a change of state without a change in temperature is ____________

A. Specific heat
B. Heat capacity
C. Latent heat
D. Boiling heat

Question 78:

How many atmospheres of pressure must a litre of gas, initially at a pressure of 1 atmosphere and temperature \(-20^{\circ} \mathrm{C}\), be after it has been compressed to \(1 / 2\) litre at \(40^{\circ} \mathrm{C}\) ?

A. \(2.47\) atm
B. \(4.5 \mathrm{~atm}\)
C. \(8.0 \mathrm{~atm}\)
D. \(3.8 \mathrm{~atm}\)
E. \(16.8 \mathrm{~atm}\)

Question 79:

On a cold day, a good conductor \(X\) feels colder to the torch than a poor conductor \(Y\) because ____________

A. Y retains more heat than X
B. The temperature of X is lower than that of Y
C. X conducts heat from the body less rapidly than Y
D. X transfers heat from body more rapidly than Y

Question 80:

The boiling point of water does not depend on ____________

A. The impurities in water
B. The external pressure
C. The quantity of water
D. All of the above