Elasticity

1. A wire is stretched to double its length The strain is

• 2
• 1
• Zero
• 0.5

2. On suspending a weight Mg , the length l of elastic wire and area of cross section A its length becomes double the initial length . The instantaneous stress action on the wire

• Mg/A
• Mg/2A
• 2Mg/A
• 4Mg/A

3. Modulus of Elasticity has the dimension same as that of

• Energy
• Power
• Pressure
• Torque

4. If longitudinal strain for a wire is 0.03 and its Poisson’s ratio is 0.5 then its lateral strain is

• 0.4
• 0.015
• 0.003
• 0.0075

5. The two wires A and B of the same material have their lengths in their ratio 1:2 and their diameter ratio 2:1 , if they are stretched with the same force , the ratio of the the increase in length of A to that B will be

• 1:2
• 4:1
• 1:4
• 1:8

6. A cube of aluminum of sides 0.1m is subjected to shearing force of 100N. The top face of the cube is displaced through 0.02cm with respect to the bottom face , the shearing strain would be

• 0.02
• 0.1
• 0.005
• 0.002

7. The Poisson’s ratio for metal is 0.25 if lateral strain is 0.0125, the longitudinal strain will be

• 0.125
• 0.05
• 0.215
• 0.0125

8. The Diameter of a brass rod is 4mm and Young Modulus of brass is 9x1010N/m 2 Find the force required to stretch by 0.1% of its original length

• 60πN
• 160πN
• 260πN
• 360πN

9. The Property of body , by virtue of which it tends to regain its original shape ands size when the applied force is removed, is known as

• Elasticity
• Plasticity
• Tensile strength
• Rigidity

10. Young’s Modulus of Elasticity of a perfectly rigid body is

• Unity
• zero
• infinity
• none of these