Solids - Jamb Physics Past Questions and Answers

Question 16:

• 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 17:

• 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 18:

• JAMB 2007

A conductor has a diameter of 1.00mm and length of 2.00m. If the resistance of the material is 0.1Ω, the resistivity is

A. 2.55 * 10⁵ Ωm
B. 2.55 * 10³ Ωm
C. 3.93 * 10^-6 Ωm
D. 3.93 * 10^-8 Ωm

Question 19:

• JAMB 2010

Two metals P and Q of length l₁ and l₂ are heated through the same temperature difference. If the ratio of the linear expansivities of P to Q is 2:3 and the ratio of lengths is 3:4. What is the ratio of increase in length of P to Q?

A. 7:5
B. 5:7
C. 1:2
D. 2:1

Question 20:

• JAMB 2013

A wire of length 100.0m at 30^o has linear expansive of 2x10^-5K^-1 Calculate the length of the wire at a temperature of - 10^oC

A. 100.08m
B. 100.04m
C. 99.96m
D. 99.92m