The breaking strength of the iron wire of radius r and length l is 2 x ${10}^6 \mathrm{N}/{\mathrm{m}}^2$. Breaking strength of another iron wire of radius r, and length l at the same temperature will be:

(1) 0.5 x ${10}^6 \mathrm{N}/{\mathrm{m}}^2$

(2) 1 x ${10}^6 \mathrm{N}/{\mathrm{m}}^2$

(3) 2 x ${10}^6 \mathrm{N}/{\mathrm{m}}^2$

(4) 8 x ${10}^6 \mathrm{N}/{\mathrm{m}}^2$

The stress-strain curve for two materials \(A\) and \(B\) are as shown in the figure. Select the correct statement:

A material has Poisson's ratio of 0.5 and  If a uniform rod of it suffers a longitudinal strain of 4 x ${10}^{-6}$, then the percentage change in its volume will be

(1) 2%

(2) 8%

(3) 0%

(4) 4%

Select the incorrect statement about Bulk modulus of elasticity.

(1) It is defined for solids, liquids and gases.

(2) ${\mathrm{B}}_{\mathrm{solid}} > {\mathrm{B}}_{\mathrm{liquid}} > {\mathrm{B}}_{\mathrm{gas}}$

(3) The bulk modulus of gas is different for different processes.

(4) Almost for all materials, the Bulk modulus increases with the rise in temperature.

The Poisson's ratio of a material is 0.5, then $\left(\frac{\mathrm{Y}}{\mathrm{B}}\right)$ is: (Y is Young's modulus, B is Bulk modulus)

(1) 5

(2) 3

(3) Zero

(4) Infinite

The Young's modulus of a wire is numerically equal to the stress at a point when:

Practical value of Poisson's ratio lies between:

(1) -1 to 0.5

(2) -0.5 to 1

(3) 0 to 0.5

(4) 0 to 1

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