Elasticity - Jamb Physics Past Questions and Answers

Question 26:

• JAMB 2017

A string of length 5cm is extended by 0.04m when a load of 0.8kg is suspended at the end. How far will it extend if a force of 16N is applied? [g = 10ms\(^{-2}\)]

A. 0.04m
B. 0.12m
C. 0.01m
D. 0.08m

Question 27:

• JAMB 2019

The diagram above represents the stress-strain graph of a loaded wire. Which of these statements is correct?

A. At J, the wire becomes plastic
B. J is the yield point
C. L is the elastic limit
D. At K, the wire breaks

Question 28:

• JAMB 2019

The point at which the molecules of a loaded wire begin to slide across each other resulting in a rapid increase in extension is

A. Yield point
B. Proportionality point
C. Deformation point
D. Elastic point

Question 29:

• JAMB 2021

If the stress on a wire is 10\(^{7}\)NM\(^{-2}\) and the wire is stretched from its original length of 10.00 cm to 10.05 cm. The young's modulus of the wire is?

A. 5.0 x 10\(^{-4}\)Nm\(^{-2}\)
B. 5.0 x 10\(^{-5}\)Nm\(^{-2}\)
C. 2.0 x 10\(^{-8}\)Nm\(^{-2}\)
D. 2.0 x 10\(^{9}\)Nm\(^{-2}\)