Question 631:

• JAMB 1991

A brass rod is 2m long at a certain temperature. What is the length for a temperature rise of 100K, if the expansivity of brass is 18 x 10^-6K^-1?

A. 2.0036m
B. 2.0018cm
C. 2.1800
D. 2.0360m

Question 632:

• JAMB 1991

What is the difference in the amount of heat given out by 4kg of steam and 4kg of water when both are cooled from 100^oC to 80^oC? [the specific latent heat of steam is 2,260,000Jkg^-1, specific heat capacity of water is 4200Jkg^-1K^-1]

A. 4200J
B. 2,260,OOOJ
C. 9,040,000J
D. 9,380,000J

Question 633:

• JAMB 1991

How long does it take a 750W heater to raise the temperature of 1kg of water from 20^oC to 50^oC [specific heat capacity of water = 4200Jkg^-1K^-1]

A. 84s
B. 112s
C. 168s
D. 280s

Question 634:

• JAMB 1991

The saturated vapour pressure of a liquid increases as the

A. Volume of the liquid increases
B. Volume of the liquid decreases
C. Temperature of the liquid increases
D. Temperature of the liquid decreases

Question 635:

• JAMB 1991

The absolute temperature of a perfect gas is proportional to the average

A. Potential energy of the molecules
B. Seperation between the molecules
C. Kinetic energy of the molecules
D. Velocity of the molecules