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Subject:Physics

The Young’s modulus for a plastic body is

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A.) One
B.) Zero
C.) Less then one
D.) Infinity
Answer is option : B
Subject:Physics

Mass of a spring is 100 gm, extension is 10cm then the work done to produce this extension is (g = 10 m/s2)

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A.) 0.05 J
B.) 10 J
C.) 0.5 J
D.) 5 J
Answer is option : A
Subject:Physics

Hooke’s law essentially defines

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A.) Stress
B.) Strain
C.) Elastic limit
D.) Yield point
Answer is option : C
Subject:Physics

The symbols Y, h and K represent respectively the Young’s modulus, rigidity modulus and bulk modulus of a body. If the rigidity modulus is three times the bulk modulus, then

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A.) Y = 3.5 K
B.) Y = 4.5 K
C.) Y = 9/5 K
D.) Y = 18/5 K
Answer is option : B
Subject:Physics

Poisson’s ratio of a material is 0.5 percentage change in its length is 0.04% what is change in percentage of diameter

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A.) 0.02%
B.) 0.03%
C.) 0.4%
D.) 0.05%
Answer is option : A
Subject:Physics

There is no change in the volume of a wire due to change in its length on stretching. The poison’s ration of the material of the wire is

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A.) -0.50
B.) +.50
C.) 0.25
D.) -0.25
Answer is option : A
Subject:Physics

Out of the following materials, whose elasticity is independent of temperature?

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A.) Copper
B.) Silver
C.) Invar steel
D.) Brass
Answer is option : C
Subject:Physics

In a wire, when the elongation is 2 cm, the energy stored is E. if the wire is stretched by 10 cm, then the energy stored in the wire will be

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A.) E
B.) 5 E
C.) 25 E
D.) 25/2 E
Answer is option : C
Subject:Physics

A wire of length L, radius r, when stretched with a force F, changes in length l. what will be the change in length in a wire of  same material having length 2 L, radius 2 r and stretched by a force of 2 F

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A.) I/2
B.) 2l
C.) 3l
D.) 4l
Answer is option : B
Subject:Physics

Four wires whose lengths and diameter respectively are given below are made of the same material. Which of these will have the largest extension when same tension is applied?

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A.) 0.50 m, 0.50 mm
B.) 2.00 m, 2.00 mm
C.) 1.00 mm, 1.00 mm
D.) 4.00 m, 4.00 mm
Answer is option : A
Subject:Physics

If a wire having initial diameter of 2 mm produced the longitudinal strain of 0.1%, then the final diameter of wire will be (s = 0.5)

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A.) 2.002 mm
B.) 1.999 mm
C.) 1.998 mm
D.) 2.001 mm
Answer is option : B
Subject:Physics

In an experiment to determine the Young’s modulus of the material of a wire, the length of the wire and the suspended mass are doubled. Then the Young’s modulus of the wire

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A.) Becomes four time
B.) Becomes double
C.) Becomes half
D.) Remain unchanged
Answer is option : D


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