WAEC Physics Past Questions & Answers - Page 39

191.

The volume of a fixed mass of a gas varies inversely as the pressure on it provided the temperature is constant. This statement is

A.

Pressure law

B.

Charles law

C.

Boyle's law

D.

General gas law

Correct answer is C

No explanation has been provided for this answer.

192.

The quantity of motion of a body is its

A.

acceleration

B.

displacement

C.

momentum

D.

velocity

Correct answer is C

No explanation has been provided for this answer.

193.

In collision between two objects, kinetic energy is conserved only if

A.

one of the objects was initially at rest

B.

potential energy is converted to work

C.

the collision is inelastic

D.

the collision is elastic

Correct answer is D

No explanation has been provided for this answer.

194.

The graph above illustrates the variation of temperature \(\theta\) with time (t) for a solid that is being heated. Which processes take place at segments P and Q respectively?
 

A.

Freezing and vaporization

B.

Evaporation and solidification

C.

Melting and boiling

D.

Condensation and evaporation

Correct answer is C

Since the substance is solid, it will need heat to melt to liquid and once the liquid starts boiling temperature will remain the same.

195.

When ultraviolet light is incident on certain metallic p articles are emitted. These particles are called

A.

positrons

B.

protons

C.

photoelectrons

D.

photons

Correct answer is D

No explanation has been provided for this answer.