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5/14 MCQs for:

Elasticity

The graph shows the behaviour of a sample of a metal when it is stretched until it starts to undergo plastic deformation. What is the estimated work done in stretching the sample from zero extension to 12.0 mm?

3.30 J.

3.55 J.

6.60 J.

3.60 J.

A mass is hung from identical wires made of aluminum, brass, copper, and steel.

Which wire will stretch the least?

Copper.

Brass.

Steel.

Aluminum.

Strain is:

The ratio of stress to elastic modulus.

The stress per unit area.

The ratio of the change in length to the original length.

The applied force per unit area.

A copper wire is found to break when subjected to minimum tension of 36 N. If the wire diameter were half as great, we would expect the wire to break when subjected to a minimum tension of:

18 N.

36 N.

9.0 N.

108 N.

A mass of 50 kg is suspended from a steel wire of diameter 1.0 mm and length 11.2 m.

How much will the wire stretch?

The Young's modulus for steel is 20 x 10¹⁰ N/m².

2.5 cm.

3.5 cm.

4.5 cm.

1.5 cm.