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Published on: 29/08/2019
Mechanical Properties of Solids
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Questions + Answers key
Take MCQ Physics Test
1.
Stress and pressure are both forces per unit area. Then, in what respect does stress differ from pressure ?
2.
A thick wire is suspended from a rigid support, but no load is attached to its free end. Is this wire under stress ?
3.
Is stress a vector quantity ?
4.
Two identical solid balls, one of ivory and the other of wet-clay, are dropped from the same height on the floor. Which will rise to a greater height after striking the floor and why ?
5.
A wire suspended vertically from one end, is stretched by attaching a weight 200 N to the lower end. The weight stretches the wire by 1 mm. The energy gained by the wire is
0.1 J
0.2 J
0.4 J
4 k
6.
Which of the following is not a unit of Young's modulus?
Nm-2
Mega Pascal (MPa)
dyne cm-2
Nm-1
7.
Elastic limit is equal to
Young's modulus
Modulus of rigidity
stress
strain
8.
Young's modulus of a material has the same unit as
stress
energy
compressibility
pressure
9.
Dimensional formula of stress is same as that of
impulse
strain
force
pressure
1.
Pressure is an external force per unit area, while stress is the internal restoring force which comes into play in a deformed body acting transversely per unit area of body.
2.
Yes, the wire is under stress due to its own weight.
3.
No, because stress is a scalar quantity, not a vector quantity.
Stress = Magnitude of internal reaction force/Area of cross−section
4.
The ball of ivory will rise to a greater height bacause, ivory is more elastic than wet-clay.
5.
(a)
0.1 J
6.
(d)
Nm-1
7.
(c)
stress
8.
(a)
stress
9.
(d)
pressure
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