The material which practically does not show elastic after effect is 

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