The Young's modulus of a rubber string 8 cm long and density  is , is suspended on the ceiling in a room. The increase in length due to its own weight will be

(a)                            (b) $9.6×{10}^{-11}m$

(c)                            (d) 9.6 m

Concept Questions :-

Stress-strain
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A and B are two wires of same material. The radius of A is twice that of B. They are stretched by the same load. Then the stress on B is

(a) Equal to that on A                  (b) Four times that on A

(c) Two times that on A               (d) Half that on A

Concept Questions :-

Stress-strain
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

If the length of a wire is reduced to half, then it can hold the ......... load

(a) Half                                  (b) Same

(c) Double                              (d) One fourth

Concept Questions :-

Stress-strain
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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

(a)   Copper is more costly than steel

(b)   Copper is more elastic than steel

(c)   Steel is more elastic than copper

(d)   None of the above

Difficulty Level:

Steel and copper wires of same length are stretched by the same weight one after the other. Young's modulus of steel and copper are  The ratio of increase in length

(a) $\frac{2}{5}$                                 (b) $\frac{3}{5}$

(c) $\frac{5}{4}$                                 (d) $\frac{5}{2}$

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The temperature of a wire of length 1 metre and area of cross-section $1c{m}^{2}$ is increased from 0°C to 100°C. If the rod is not allowed to increase in length, the force required will be

(a) ${10}^{3}N$                     (b) ${10}^{4}N$

(c) ${10}^{5}N$                     (d) ${10}^{9}N$

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Two wires of copper having the length in the ratio 4 : 1 and their radii ratio as 1 : 4 are stretched by the same force. The ratio of longitudinal strain in the two will be

(a) 1 : 16                                             (b) 16 : 1

(c) 1 : 64                                             (d) 64 : 1

Concept Questions :-

Hooke's law
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The force constant of a wire does not depend on

(a) Nature of the material                      (b) Radius of the wire

(c) Length of the wire                           (d) None of the above

Concept Questions :-

Stress-strain
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The length of a wire is 1.0 m and the area of cross-section is $1.0×{10}^{-2}c{m}^{2}$. If the work done for increase in length by 0.2 cm is 0.4 joule, then Young's modulus of the material of the wire is

(a) $2.0×{10}^{10}N/{m}^{2}$             (b) $4×{10}^{10}N/{m}^{2}$

(c) $2.0×{10}^{11}N/{m}^{2}$             (d) $2×{10}^{10}N/{m}^{2}$

Concept Questions :-

Stress-strain
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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

(a)   Intermolecular repulsion

(b)   Intermolecular behaviour

(c)   Viscosity

(d)   Elasticity

Concept Questions :-

Elasticity