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Young's Modulus
Young's Modulus
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1)
What is Young’s modulus ?
Strain / Stress
Longitudinal stress / longitudinal strain
Change in length / original length
Stress / change in length
2)
What is the property of a body by virtue of which it tends to regain its original size and shape by the removal of applied force is called?
Strain
Plasticity
Deformation
Elasticity
3)
Which of the following comes under the category of longitudinal stress?
Both b and c
Tensile stress
Shearing stress
Compression stress
4)
When the density of a material increases, what will happen to its Young’s modulus?
decreases
None of these
increases
Remains constant
5)
What does the following statement mean? “The elastic limit of steel is greater than that of rubber”.
Rubber is more elastic than steel
Both a and c
Steel is not an elastic material
Steel is more elastic than rubber
6)
Which of the following is an example of elastic body?
Glass
Both b and c
Mud
Wax
7)
What happen when bodies are deformed beyond elastic limit?
They stay permanently deformed
They suddenly turned back to its original shape
The modulus of elasticity decreases
All of the above
8)
The young’s modulus of a wire of radius R and length L is Y N/m2. If the radius and length are changed to 2R and 4L respectively, then its young’s modulus will be ?
2Y
Y
8Y
0
9)
A wire extends 1 cm by the application of certain force. Double the force is applied to another wire of same material and length, but half the radius of previous one. Then what will be the elongation produced by the wire?
0.8m
0.08m
0.8cm
8mm
10)
The ratio of radius of two wires is 2:1. If the same force is applied to both of them, the extension produced is in the ratio 2:3. What will be the ratio of their lengths?
1:1
2:3
1:3
1:6