Which of the following has the greatest elasticity?

(1) Rubber

(2) Steel

(3) Wood

(4) Mud

The figure below shows the stress-strain curve for two bodies A and B.

Choose the correct option.

(1) A is having greater elasticity than B.

(2) B is having a greater elasticity than A.

(3) Both A and B have the same elasticity.

(4) A and B both show plasticity.

A rod of uniform cross-sectional area 10 ${\mathrm{mm}}^2$, weighing 5 kg and length 2 m is suspended vertically from a fixed support. What is the elongation produced in the rod?

(Young's modulus for rod = 2 x ${10}^{11} \mathrm{N}/{\mathrm{m}}^2$)

1. 50 × ${10}^{-6}$ m

2. ${10}^{-4}$ m

3. 15 × ${10}^{-6}$ m

4. 25 × ${10}^{-6}$ m

Unit of tensile strain is:

(1) meter

(2) newton-metre

(3) ${\left(\mathrm{meter}\right)}^2$

(4) Unitless

Compressibility of a substance is equal to reciprocal of:

(1) Bulk modulus

(2) Young's modulus

(3) Rigidity modulus

(4) Poisson's ratio

For two different material wires of the same dimensions, Young's modulus is:

(1) Higher for A

(2) Higher for B

(3) Same for both

(4) Infinite for both

When a load of 1 kg is hung from the wire, then the extension of 2 mm is produced. Then work done by restoring force is:

(1) 200 mJ

(2) 400 mJ

(3) 10 mJ

(4) 20 mJ

The longitudinal strain is possible in:

(1) Liquid

(2) Solid

(3) Gasses

(4) All of these

Breaking stress of a steel wire of length L and radius r is F. If its radius is doubled and length is halved, its new breaking stress will be:

(1) 2F

(2) F

(3) F/2

(4) 4F

Compressed rubber ball has:

(1) decreased potential energy.

(2) increased potential energy.

(3) decreased kinetic energy.

(4) increased kinetic energy.