JAMB Physics Past Questions & Answers - Page 348

1,736.

The mechanism of heat transfer from one point to another through the vibration of the molecules of the medium is

A.

covection

B.

conduction

C.

radiation

D.

diffusion

Correct answer is B

No explanation has been provided for this answer.

1,737.

The rise or fall of a liquid in a narrow tube is because of the

A.

viscosity of the liquid

B.

surface tension of the liquid

C.

friction between the walls of the tube and the liquid

D.

osmotic pressure of the liquid

Correct answer is B

No explanation has been provided for this answer.

1,738.

What will happen to the boiling point of pure water when it is heated in a place 30m below sea level?

A.

It will be more than 100 oC

B.

It will be last than 100 oC

C.

It will still be at 100 oC

D.

It will be fluctuating

Correct answer is A

No explanation has been provided for this answer.

1,739.

Steam from boiling water causes more damage on the skin than does boiling water because

A.

water has a high specific heat

B.

steam has latent heat of fusion

C.

the steam is at a highter temperature than the water

D.

steam brings heat more easily by convection

Correct answer is D

No explanation has been provided for this answer.

1,740.

Two liquids X and Y having the same mass are supplied with the same quantity of heat. If the temperature rise in X is twice that of Y, the ratio of specific heat capacity of X to that of Y is

A.

2:1

B.

1:2

C.

4:1

D.

1:4

Correct answer is B

MC\(x_\theta\) = MC\(y_\theta\)

\(x_\theta\) = 2 \(\times y_\theta\)

MC(2\(y_\theta\)) = MC\(y_\theta\)

⇒ 2C = C

=1 : 2