Question 3 :
In Youngs expt., the distance between two slits is d/3 and the distance between the screen and the slits is 3D. The number of fringes in 1/3 m on the screen, formed by monochromatic light of wavelength $3\lambda $, will be? 
Question 5 :
Change in shape of a body caused by the application of stress is called:<br>
Question 6 :
The property to restore the natural shape or to oppose the deformation is called :
Question 7 :
For which of the following is the modulus of rigidity highest?<br>
Question 8 :
The Young's modulus of the material of the wire of length $L$ and radius $r$ is $Y{ N }/{ { m }^{ 2 } }$. If the length is reduced to ${ L }/{ 2 }$ and radius ${ r }/{ 2 }$, the Young's modulus will be:
Question 9 :
The limit upto which the stress is directly proportional to strain is called<br>
Question 11 :
A given quantity of an ideal gas is at pressure $P$ and absolute temperature $T.$ The isothermal bulk modulus of the gas is:
Question 12 :
A wire $1 m$ long has cross-section $1 mm^{2}$ and $Y = 1.2\times10^{11}Pa$. Find the work done in stretching it by $2 mm.$<br/>
Question 14 :
If a wire is stretched by applying force at one of its ends, then the elastic potential energy density in terms of Young's modulus <i>Y </i>and linear strain $\alpha$ will be<br/>
Question 15 :
If a member, whose tensile strength is more than 1.5 times the shear strength and is subjected to an axial load upto failure, the failure of the member will occur by
Question 16 :
If the work done by stretching a wire by $1mm$ is $2J$, the work necessary for stretching another wire of the same material but with half the radius of cross section and half the length by $1mm$ is<br/>
Question 17 :
When an elastic material with Young's modulus Y is subjected to stretching stress S, elastic energy stored per unit volume of the material is
Question 18 :
A steel cylindrical rod of length $l$ and radius $r$ is suspended by its end from the ceiling. Define $U$ in terms of tensile strain $\displaystyle\frac{\Delta l}{l}$ of the rod.