Hooke's law is applicable for:

1.	elastic materials only	2.	plastic materials only
3.	elastomers only	4.	all of these

The figure shows the graph between stress and strain for a uniform wire at two different temperatures. Then:

1. ${\mathrm{T}}_1>{\mathrm{T}}_2$

2. ${\mathrm{T}}_2>{\mathrm{T}}_1$

3. ${\mathrm{T}}_1={\mathrm{T}}_2$

4. None of these

If two different types of rubber are found to have stress-strain curves as shown, then:
                   

On withdrawing the external applied force on bodies within the elastic limit, the body:

The modulus of rigidity of the ideal liquid is:

A rod of length 1.05 m having negligible mass is supported at its ends by two wires of steel (wire A) and aluminium (wire B) of equal lengths as shown in the figure. The cross-sectional areas of wires A and B are 1.0 $m{m}^2$ and 2.0 $m{m}^2$, respectively. At what point along the rod should a mass m be suspended in order to produce equal stresses in both steel and aluminium wires?
           

Anvils made of single crystals of diamond, with the shape as shown in the figure, are used to investigate the behaviour of materials under very high pressures. Flat faces at the narrow end of the anvil have a diameter of 0.50 mm, and the wide ends are subjected to a compressional force of 50,000 N. What is the pressure at the tip of the anvil?

$1. 2.5\times {10}^{11}$ $\mathrm{Pa}$
$\left(\mathrm{ 2.}\right)$ $\mathrm{ 3}.7\times {\mathrm{}}^{}$10¹¹ Pa
$\left(\mathrm{ 3.}\right)$ $\mathrm{ 2}.1\times {10}^{\mathrm{}}$¹¹ Pa
 4.  1.9×10¹¹Pa${\mathrm{}}^{}$

The volume contraction of a solid copper cube, 10 cm on an edge, when subjected to a hydraulic pressure of \(7.0\times10^6\) Pa is: (Bulk modulus of copper is $140\times {10}^9$ $\mathrm{Pa}$.)
1. \( 3.1 \times 10^{-2} \mathrm{~m}^3 \)
2. \(9.1 \times 10^{-3} \mathrm{~cm}^3 \)
3. \(5.0 \times 10^{-2} \mathrm{~cm}^3 \)
4. \(7.9 \times 10^{-2} \mathrm{~cm}^3\)$$

What is the density of water at a depth where pressure is 80.0 atm, given that its density at the surface is 1.03×\(10^{3}\) \(\text{kg}\) \(\text{m}^{- 3}\)?
1. \(0 . 021 \times 10^{3}~\text{kg m}^{-3}\)
2. \(4.022 \times10^{3}~\text{kg m}^{-3}\)
3. \(3.034 \times 10^{3}~\text{kg m}^{-3}\)
4. \(1.034 \times 10^{3}~\text{kg m}^{-3}\)

A steel cable with a radius of 1.5 cm supports a chairlift at a ski area. If the maximum stress is not to exceed 10⁸ N/m², what is the maximum load that the cable can support?
1. 7.06 x 10⁴ N
2. 5.03 x 10⁴ N
3. 1.09 x 10⁴ N
4. 17 x 10⁴ N