Which of the following materials exhibits almost no elastic after-effect in practice?
1. Copper                         
2. Rubber
3. Steel                             
4. Quartz

The relationship between Young's modulus Y, Bulk modulus K and modulus of rigidity n is

1. $Y=\frac{9nK}{n+3K}$                                    

2. $\frac{9YK}{Y+3K}$ 

3.  $Y=\frac{9nK}{3+K}$                                     

4. $Y=\frac{3nK}{9n+K}$         

Why the spring is made up of steel in comparison of copper?

1. Copper is more costly than steel

2. Copper is more elastic than steel

3. Steel is more elastic than copper

4. None of the above

The quality of the material which opposes the change in shape, volume or length is called

1.   Intermolecular repulsion

2.   Intermolecular behaviour

3.   Viscosity

4.   Elasticity

Which one of the following substances possesses the highest elasticity:

1. Rubber                             

2. Glass

3. Steel                               

4. Copper

Which of the following affects the elasticity of a substance

1. Hammering and annealing

2. Change in temperature

3. Impurity in substance

4. All of these

The Young's modulus of the material of a wire is \(6\times 10^{12}~\text{N/m}^2\) and there is no transverse strain in it, then its modulus of rigidity will be:

1. \(3\times 10^{12}~\text{N/m}^2\)
2. \(2\times 10^{12}~\text{N/m}^2\)
3. \(10^{12}~\text{N/m}^2\)
4. None of the above

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied?

Bridges are declared unsafe after a long time of their use due to:

(1) Elastic after effect

(2) Elastic fatigue

(3) Plasticity

(4) Both (1) & (2)

A steel wire is fixed at its one end on the roof. At other ends of the wire, 1 kg mass is hanged so that the energy stored in the wire is E. The energy stored in the same wire if we hang 2 kg mass instead of 1 kg is:

(1) 2E

(2) 4E

(3) 8E

(4) E