Question Text
Question 1 :
The force required to double the length of the steel wire of area of cross section $5\times 10^{-5}m^{2}\quad (Y=20\times 10^{10}Pa)$ in $N$ is:
Question 2 :
If Poisson's ratio $\sigma$ for a material is $-\dfrac {1}{2}$, then the material is
Question 4 :
A compressive force is applied to a uniform rod of rectangular cross-section so that its length decreases by $1\%$. If the Poisson’s ratio for the material of the rod be $0.2$, which of the following statements is correct ? The volume approximately .....”
Question 7 :
When a body undergoes a linear tensile strain if experience a lateral contraction also. The ratio of lateral contraction to longitudinal strain is known as
Question 8 :
A wire ($Y=2\times {10}^{11}N/m$) has length $1m$ and area $1m{m}^{2}$. The work required to increased its length by $2mm$ is
Question 10 :
Assertion: Stress is the internal force per unit area of a body.
Reason: Rubber is more elastic than steel.
Question 11 :
A spring is made of steel and not of copper because
Question 12 :
When a rubber cord is stretched, the change in volume is negligible compared to the change in its linear dimension. Then poisson's ratio for rubber is
Question 14 :
 A cable that can support a load of 1000 N is cut into equal parts. the maximum load that can be supported by the either part is:-
Question 16 :
A wire of length L and radius r fixed at one end and a force F applied to the other end produces and extension $l$ . The extension produced in another wire of the same material of length 2Land radius 2r by a force 2 F is:
Question 17 :
Fill in the blank.<br/>In a technical sense a substance with a ________ elasticity is one that requires a ______  force to produce a distortion-for example, a steel sphere. <br/><br/>
Question 18 :
Energy per unit volume in a stretched wire is equal to