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 4 :
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 5 :
The temperature of a wire is doubled. The Young's modulus of elasticity will ?
Question 7 :
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 8 :
Assertion: Strain is a unitless quantity.
Reason: Strain is equivalent to force
Question 10 :
 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 11 :
A wire whose cross-sectional area is $4\ mm^{2}$ is stretched by $0.1\ mm$ by a certain load. If a similar wire of double the area of cross-section is under the same load, then the elongation would be
Question 12 :
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 13 :
A material has Poisson's ratio $0.5$. if a uniform rod of it suffers a longitudinal strain of $2\times {10}^{3}$, then the percentage change in volume is
Question 14 :
A spring is made of steel and not of copper because
Question 15 :
Assertion: Stress is the internal force per unit area of a body.
Reason: Rubber is more elastic than steel.
Question 16 :
Change in the shape of a body caused by the application of a force (stress) is called as :<br/>
Question 17 :
A wire suspended vertically from one of its ends is stretched by attaching a weight of 200 N to the lower end. The weight stretches the wire by 1 mm. Then the elastic energy stored in the wire is:          
Question 18 :
The property of metals which allows them to be drawn readily into thin wires is:
Question 19 :
Assertion: The strain present in the material after unloading is called the residual strain or plastic strain and the strain disappears during unloading is termed as recoverable or elastic strain.
Reason: After yieild point, there is some residual stress left in an material on unloading.
Question 20 :
State whether true or false :<br>The hollow shaft is much stronger than a solid shaft of same mass, same length and same material.
Question 21 :
Energy per unit volume in a stretched wire is equal to
Question 22 :
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?
Question 23 :
A wire suspended vertically from one of its ends is stretched by attaching a weight of $200N$ to the lower end. The weight stretches the wire by $1mm$. Then the elastic energy stored in the wire is
Question 24 :
A wire is stretched to double its length. The strain is :
Question 26 :
There are two wires of same material. their radii and lengths are both in the ratio 1:2. if the extensions produced are equal, what is the ratio of the loads?
Question 27 :
Let ${Y}_{S}$ and ${Y}_{A}$ represent Young's modulus for steel and aluminium respectively It is said that steel is more elastic than aluminium. Therefore, it follows that
Question 28 :
Change in shape of a body caused by the application of stress is called:<br>
Question 29 :
The property of a material due to which shape is changed permanently is known as:<br/>
Question 30 :
The limit upto which the stress is directly proportional to strain is called<br>
