Elasticity - Jamb Physics Past Questions and Answers

Question 16:

• JAMB 1997

A load of 20N on a wire of cross-sectional area 8 x 10^-7m², produces an extension of 10m². calculate Young's modulus for the material of the wire if its length is 3m

A. 7.0 x 10¹¹Nm^-2
B. 7.5 x 10¹¹Nm^-2
C. 8.5 x 10¹¹Nm^-2
D. 9.0 x 10¹¹Nm^-2

Question 17:

• JAMB 1999

If the stress on a wire is 10⁷NM^-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 10⁴ Nm^-2
B. 5 . 0 x 10⁵ Nm^-2
C. 2 . 0 x 10⁸ Nm^-2
D. 2 . 0 x 10⁹ Nm^-2

Question 18:

• JAMB 2003

Given that young's modulus for aluminium is 7.0 x 10¹⁰Nm^-2 and density is 2.7 x 10³kgm^-3 find the speed of the sound produced if a solid bar is struck at one end with a hammer

A. 5.1 x 10³ms^-1
B. 4.2 x 10³ms^-1
C. 3.6 x 10³ms^-1
D. 2.8 x 10³ms^-1

Question 19:

• JAMB 2006

The diagram above represents the stress-strain graph for a typical metal rod. What does the X represent?

A. Breaking point
B. Yield point
C. Elastic limit
D. Proportional limit

Question 20:

• JAMB 2008

A spring of force constant 500 NM^-1 is compressed such that its length shortens by 5cm. The energy stored in the spring is?

A. 0.625 J
B. 6.250 J
C. 62.500 J
D. 625.000 J