When a certain weight is suspended from a long uniform wire, its length increases by one cm. If the same weight is suspended from another wire of the same material and length but having a diameter half of the first one then the increase in length will be -

(1) 0.5 cm

(2) 2 cm

(3) 4 cm

(4) 8 cm

Subtopic:  Hooke's Law |
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The area of cross-section of a wire of length 1.1 metre is 1$m{m}^{2}.$It is loaded with 1 kg. If Young's modulus of copper is $1.1×{10}^{11}N/{m}^{2},$ then the increase in length will be (If $g=10m/{s}^{2}$)

(1) 0.01 mm

(2) 0.075 mm

(3) 0.1 mm

(4) 0.15 mm

Subtopic:  Hooke's Law |
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In CGS system, the Young's modulus of a steel wire is  . To double the length of a wire of unit cross-section area, the force required is

(a) $4×{10}^{6}$dynes                     (b) $2×{10}^{12}dynes$

(c) $2×{10}^{12}newtons$                (d) $2×{10}^{8}$dynes

Subtopic:  Hooke's Law |
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The material which practically does not show elastic after effect is

(1) Copper

(2) Rubber

(3) Steel

(4) Quartz

Subtopic:  Elasticity |
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A force F is needed to break a copper wire having radius R. The force needed to break a copper wire of radius 2R will be

(1) F/2

(2) 2F

(3) 4F                                       (4) F/4

Subtopic:  Stress - Strain |
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The relationship between Young's modulus Y, Bulk modulus K and modulus of rigidity n is

(1) $Y=\frac{9nK}{n+3K}$

(2) $\frac{9YK}{Y+3K}$

(3)  $Y=\frac{9nK}{3+K}$

(4) $Y=\frac{3nK}{9n+K}$

Subtopic:  Elasticity |
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The Young's modulus of a rubber string 8 cm long and density  is , is suspended on the ceiling in a room. The increase in length due to its own weight will be

(1)

(2) $9.6×{10}^{-11}m$

(3)

(4) 9.6 m

Subtopic:  Stress - Strain |
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A and B are two wires of same material. The radius of A is twice that of B. They are stretched by the same load. Then the stress on B is

(1) Equal to that on A                 (2) Four times that on A

(3) Two times that on A

(4) Half that on A

Subtopic:  Stress - Strain |
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If the length of a wire is reduced to half, then it can hold the ......... load

(1) Half

(2) Same

(3) Double

(4) One fourth

Subtopic:  Stress - Strain |
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Why the spring is made up of steel in comparison of copper

(1)   Copper is more costly than steel

(2)   Copper is more elastic than steel

(3)   Steel is more elastic than copper

(4)   None of the above

Subtopic:  Elasticity |
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