Thermal Expansion - Jamb Physics Past Questions and Answers

Question 16:

• JAMB 1998

The linear expansivity of brass is 2 x 10^-5C^-1. If the volume of a piece of brass is 15.00cm³ at 0⁰C, What is the volume at 100^oC?

A. 16.03cm³
B. 16.00cm³
C. 15.09cm³
D. 15cm³

Question 17:

• JAMB 2003

On a fairly cool rainy day when the temperature is 20^oC, the length of a steel railroad track is 20m. What will be its length on a hot a dry day when the temperature is 40^oC?
[coefficient of linear expansion of steel = 11 x 10^-6K^-1]

A. 20.013m
B. 20.009m
C. 20.004m
D. 20.002m

Question 18:

• JAMB 2004

Metal rods of length 20m each are laid end to end to form a bridge at 25oC. What gap will be provided between consecutive rails for the bridge to withstand 75oC?
[Linear expansivity of the material = 2.0 x 10-5K-1

A. 0.20m
B. 0.22m
C. 0.25m
D. 0.02m

Question 19:

• JAMB 2007

A blacksmith heated a metal whose cubic expansivity is 6.3 x 10^-6K^-1. The areal expansivity is

A. 2.0 x 10^-6K^-1
B. 2.1 x 10^-6K^-1
C. 4.2 x 10^-6K^-1
D. 6.3 x 10^-6K^-1

Question 20:

• JAMB 2007

The ratio of the coefficient of linear expansion of two metals ^∝₁/_∝[sub]2[/sub] is 3:4. If, when heated through the same temperature change, the ratio of the increase in length of the two metals, ^e₁/_e[sub]2[/sub] is 1:2, the ratio of the original lengths ^l₁/_l[sub]2[/sub] is

A. ⁸/₃
B. ³/₂
C. ²/₃
D. ³/₈