Select the wrong definition.

1. Deforming Force - force that changes configuration of body

2. Elasticity - property of regaining original configuration

3. Plastic body - which can be easily melted

4. Elastic limit - beyond which material begins to flow

The shear strain is possible in

1. Solids

2. Liquids

3. Gases

4. All of these

The ratio of radii of two wires of the same material is 2: 1. If these wires are stretched by equal force, the ratio of stresses produced in them is:

1. 2: 1

2. 1: 2

3. 1: 4

4. 4: 1

A steel wire of diameter 2 mm has a breaking strength of $4\times {10}^5 \mathrm{N}$. What is the breaking force of similar steel wire of diameter 1.5 mm?

1. $2.3\times {10}^5 \mathrm{N}$

2. $2.6\times {10}^5 \mathrm{N}$

3. $3\times {10}^5 \mathrm{N}$

4. $1.5\times {10}^5 \mathrm{N}$

A steel wire is 1 m long and 1 mm² in area of cross section. If it takes 200 N to stretch this wire by 1 mm, how much force will be required to stretch a wire of the same material as well as diameter from its normal length of 10 m to a length of 1002 cm?

1. 1000 N

2. 200 N

3. 400 N

4. 2000 N

What is the percentage increase in length of a wire of diameter 2.5 mm, stretched by a force of 100 kg wt? Young's modulus of elasticity of wire$=12.5\times {10}^{11} \mathrm{dyne}/{\mathrm{cm}}^2$

1. 0.16%

2. 0.32%

3. 0.08%

4. 0.12%

A rod of length l and radius r is held between two rigid walls so that it is not allowed to expand. If its temperature is increased, then the force developed in it is proportional to

1. l

2. $\frac{1}{\mathrm{l}}$

3. ${\mathrm{r}}^2$

4. ${\mathrm{r}}^{-2}$

A uniform cubical block is subjected to volumetric compression, which decreases its each side by 2%. The Bulk strain produced in it is

1. 0.03

2. 0.02

3. 0.06

4. 0.12

A material has Poisson's ratio 0.5. If a uniform rod of it suffers a longitudinal strain of $3\times {10}^{-3}$, what will be percentage increase in volume?

1. 2%

2. 3%

3. 5%

4. 0%

Hooke's law is applicable for: