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.

Stress vs strain graphs for two different wires \(A\) and \(B\) are given. If \(Y_A\) and \(Y_B\) are Young's moduli of the materials, then:
                  
1. \(Y_{A}=\sqrt{3} Y_{B} \)
2. \( \sqrt{3} Y_{A}=Y_{B} \)
3. \(Y_{A}=3 Y_{B} \)
4. \( 3 Y_{A}=Y_{B} \)

Hooke's Law is obeyed within:

(1) Elastic limit

(2) Proportionality limit

(3) Breaking point

(4) Freezing point

The length of a wire is 2.01 m when 5 kg is hanging from it and 2.02 m when 10 kg is hanging, then the natural length of wire is:

(1) 2 m

(2) 1.95 m

(3) 1.9 m

(4) 2.005 m

Elongation in the wire of length L and Young's modulus of Y when blocks of weight W each are hung as shown below-

1.  $\frac{\mathrm{WL}}{\mathrm{AY}}$

2.  $\frac{2\mathrm{WL}}{\mathrm{AY}}$

3.  $\frac{\mathrm{WL}}{2\mathrm{AY}}$

4.  $\frac{1}{4}\left(\frac{\mathrm{WL}}{\mathrm{AY}}\right)$

A uniform rod suspended from the ceiling gets elongated by its weight. Which one of the following graphs represents the variation of elongation with length, \(L\)?

1.		2.
3.		4.

The diagrams represent the potential energy U as a function of interatomic separation r. Which of the following diagrams corresponds to stable molecules found in nature?

1.  

2.  

3.  

4.  

The maximum load that a wire can bear is W. If the wire is cut to half of its length, then the maximum load it can sustain is:

1.  $\frac{\mathrm{W}}{4}$

2.  $\frac{\mathrm{W}}{3}$

3.  $\frac{\mathrm{W}}{2}$

4.  W