Definition and determination of linear - Jamb Physics Past Questions and Answers

Question 6:

• JAMB 1990

A bar of initial length /₀ is heated through a temperature change \(\Delta\)t to a new length I. The linear expansivity, a, of the bar is

A. \(\frac{/ - /_o}{/ \Delta t}\)
B. \(\frac{/ - /_o}{/_o \Delta t}\)
C. /_o(1 + \(\Delta\) t)
D. \(\frac{/ - /_o}{/(1 + \Delta t)}\)

Question 7:

• 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 8:

• JAMB 1992

A bridge made of steel is 600m long. What is the daily variation in its length if the night-time and daytime temperatures are 10°C and 35°C respectively. The linear expansivity of steel is 0.000012C\(^{-1}\).

A. 0.18cm
B. 1.80cm
C. 18.00cm
D. 1800cm

Question 9:

• JAMB 1993

A metal rod 800mm long is heated from 10^oC to 95^oC. If it expands by 1.36mm, the linear expansivity of the metal is

A. 2.0 x 10²K^-1
B. 2.0 x 10²K^-1
C. 5.0 x 10^-3K^-1
D. 2.0 x 10^-5K^-1

Question 10:

• JAMB 1995

A rectangular metal block of volume 10^-6m³ at 273k is heated to 573k. If its coefficient of linear expansion is 1.2 x 10^-5k^-1, the percentage change of it volume is

A. 1.5%
B. 1.1%
C. 0.4%
D. 0.1%