1 : In case of steel wire or a metal wire,the elastic limit is reached when
Options:
  1. the wire just breaks
  2. elongation is inversely proportional to the tension
  3. the load is more than the weight of wire
  4. none of the above

Answer: Option 3

Explanation:

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2 : A uniform cube is subjected to volume compression .If each side is decreased by 1%,then bulk strain is --------
Options:
  1. 0.06
  2. 0.03
  3. 0.02
  4. 0.01

Answer: Option 2

Explanation:

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3 : When a metal wire elongates by hanging a load Mg on it,the gravitational potential energy of mass M decreases by Mgl.This energy appears as ---------
Options:
  1. thermal energy completely
  2. elastic potential energy completely
  3. both of the above
  4. none of the above

Answer: Option 1

Explanation:

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4 : The longitudinal extension of any elastic material is very small.in order to obtain appreciable change the form of material will be ----
Options:
  1. long thin wire
  2. short thick wire
  3. long thick wire
  4. none of the above

Answer: Option 1

Explanation:

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5 : The only elastic modulus which is applicable to fluids is --------
Options:
  1. Bulk modulus
  2. Shear modulus
  3. Modulus of rigidity
  4. all of the above

Answer: Option 1

Explanation:

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6 : When a steel wire fixed at one end is pulled by a constant force F at its other end,its length increases by l.Which of these is wrong?
Options:
  1. Work done by the external force is Fl
  2. The elastic potential energy is Fl
  3. The elastic potential energy is Fl/2
  4. The heat produced is equal to half of the elastic potential energy stored in the wire

Answer: Option 4

Explanation:

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7 : A uniform rod of mass m,length L,area of cross-section A and Young's modulus Y hangs from the ceiling.Its elongation under its own weight will be ------
Options:
  1. zero
  2. 2mgL/AY
  3. mgL/2AY
  4. none of the above

Answer: Option 3

Explanation:

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8 : If the braking force for a given wire is F, then the breaking force of two wires of same magnitude will be
Options:
  1. F
  2. 4F
  3. 8F
  4. 2F

Answer: Option 4

Explanation:

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9 : When Shearing force is applied on a body, then the elastic potential energy is stored in it. On removing the force, this energy
Options:
  1. converts into kinetic energy
  2. converts into heat energy
  3. remains as potential energy
  4. none of the above

Answer: Option 2

Explanation:

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10 : Increase in length of a wire is 1 mm when suspended by a weight. If the same weight is suspended on a wire of double its length and double its radius, the increase in length will be
Options:
  1. 2 mm
  2. 0.5 mm
  3. 4 mm
  4. 0.25 mm

Answer: Option 2

Explanation:

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