Question 446:

• JAMB 1987

The length of a side of a metallic cube at 20^oC is 5.0cm. Given that the linear expansivity of the metal is 4.0 x 10^-5k^-1, find the volume of the cube at 120^oC .

A. 126.50cm³
B. 126.25cm³
C. 126.00cm³
D. 125.00cm³

Question 447:

• JAMB 1987

As a result of air at the top of a barometer, the height of the mercury column is 73.5cm when it should be 75.0cm; the volume of the space above the mercury is 8.0cm³. Calculate the correct barometer height when the barometer reads 74.0cm and the volume of the space above the mercury is 6.0cm³.

A. 72.0cm
B. 74.5cm
C. 75.1cm
D. 76.0cm

Question 448:

• JAMB 1987

Hot water is added to three times its mass of water at 10^oC and the resultant temperature is 20^oC. What is the initial temperature of the hot water?

A. 100^oC
B. 80^oC
C. 50^oC
D. 40^oC

Question 449:

• JAMB 1987

22,000J of heat is required to raise the temperature of 1.5kg of paraffin from 20^oC to 30^oC. Calculate the specific heat capacity of paraffin.

A. 1466Jkg^-1oC^-1
B. 2933Jkg^-1oC^-1
C. 4400Jkg^-1oC^-1
D. 5866Jkg^-1oC^-1

Question 450:

• JAMB 1987

In which of the following are the substance arranged in descending order of their thermal conductivities?

A. Copper, steel, glass
B. Steel, copper, glass
C. Steel, glass, copper
D. Copper, glass, steel