If Young modulus (Y) equal to bulk modulus (B). Then the Poisson ratio is :
1.
2.
3.
4.
Bridges are declared unsafe after a long time of their use due to:
(1) Elastic after effect
(2) Elastic fatigue
(3) Plasticity
(4) Both (1) & (2)
A steel wire is fixed at its one end on the roof. At other ends of the wire, 1 kg mass is hanged so that the energy stored in the wire is E. The energy stored in the same wire if we hang 2 kg mass instead of 1 kg is:
(1) 2E
(2) 4E
(3) 8E
(4) E
The bulk modulus of a rubber ball is . To what depth below the surface of the sea, should the ball be taken so as to decrease its volume by 0.1%?
(1) 1 m
(2) 10 m
(3) 90 m
(4) 1 km
What is the value of Poisson's ratio for an incompressible material?
(1) Zero
(2) 0.2
(3) 0.5
(4) Infinite
If the Poisson's ratio of a material is 0.5, then its bulk modulus is equal to:
(1) Zero
(2) Young's modulus
(3) Infinite
(4) Three times Young's modulus
A uniform wire of cross-sectional area A is stretched by a certain force so that its length is elongated by x. What should be the cross-sectional area of the wire, so that elongation becomes on applying the same force?
(1) A
(2) 2A
(3) 4A
(4) 8A
A wire suspended vertically from one of its ends is stretched by attaching a weight of 100 N. If the elastic energy stored in the wire is 0.1 J. The elongation in the wire is:
(1) 1 mm
(2) 2 mm
(3) 3 mm
(4) 4 mm
Breaking stress of a wire of length L and radius r is B. If another wire made of the same material has length 2L and radius 2r, its breaking stress will be:
(1) 2B
(2)
(3) B
(4) 4B
If E is the energy stored per unit volume in a wire having Young's modulus of the material Y, then stress applied is:
1.
2.
3.
4.