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