Question 1 :
The length of an elastic spring is '$a$' when tension is $4 N$ and '$b$' when the tension is $5N$. The length of the spring when tensionis 9N is

Question 2 :
A wire of density $9\times{10^3}kg/{m^3}$ is stretched between two clamps 1 m apart and is stretched to an extension of $4.9\times{10^{ - 4}}metre.$ Young's modulus of material is $9\times{10^{10}}N/{m^2}$. Then

Question 3 :
A metal cube of side length 8.0 cm has its upper surface displaced with respect to the bottom by 0.10 mm when a tangential force of 4 x N is applied at the top with bottom surface fixed. The rigidity modulus of the material of the cube is <br>

Question 4 :
Ratio of lengths of two brass wires is 3 : 4; their areas of cross section are in the ratio 2:3. When same force is applied on them, the elongations produced will be in the ratio:

Question 5 :
Two wires of the same material and length are stretched by the same force. Their masses are in the ratio $3 : 2$. Their elongations are in the ratio<br>

Question 6 :
Four wires made of same materials are stretched by the same load. Their dimensions are given below. The one which elongates more is ?

Question 7 :
Assertion: If a metal wire is attached to the ceiling of a room and mass $m$ is attached to another end, the energy stored in the stretched wire is $mgl/2$ where $l$ is the increment in length of wire Reason: In the above statement loss in gravitational energy is $mgl$ while the loss in energy to surrounding is $\dfrac{mgl}{2}$

Question 8 :
Identify the case when an elastic metal rod does not undergo elongation:

Question 9 :
The force required to double the length of a steel&#160;wire of area of cross-section $5 \times 10^{-5} &#160;m^{2}$ (in N) is :<br/>($Y=20 \times 10^{10} &#160;Pa$)<br/>

Question 10 :
Assertion: Bulk modulus of elasticity ($K$) represents incompressibility of the material. Reason: Bulk modulus of elasticity is proportional to change in pressure.