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Elasticity Test - 4
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Elasticity Test - 4
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  • Question 1/10
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    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:

    Solutions

     

  • Question 2/10
    1 / -0

    Three identical balls of rubber, aluminium, and steel are dropped from the same height on a horizontal rigid surface. If Vrubber VAl, and Vsteel are their speeds just after the collision, then

    Solutions

    As we know, Es>EAl>Erubber

    Therefore, Vrubber<VAl<Vsteel

     

  • Question 3/10
    1 / -0

    The breaking strength of the iron wire of radius r and length l is 2 x 106 N/m2. Breaking strength of another iron wire of radius r, and length l at the same temperature will be:

    Solutions

    At the same temperature, the breaking strength of another iron wire of radius r, and length l will be the same i.e. 2×106 N/m2.

     

  • Question 4/10
    1 / -0

    Which of the following has the greatest elasticity?

    Solutions

    Steel has the maximum elasticity among the given substances.

     

  • Question 5/10
    1 / -0

    Compressed rubber ball has:

    Solutions

    When we compress the ball then its potential energy gets increased.

     

  • Question 6/10
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    The diagrams represent the potential energy U as a function of interatomic separation r. Which of the following diagrams corresponds to stable molecules found in nature?

    Solutions

    The potential energy function u(r) of inter-atomic distance r is given by,

     

  • Question 7/10
    1 / -0

    In the following questions, a statement of assertion (A) is followed by a statement of the reason (R).

    A: Steel is more elastic than rubber.

    R: Deformation in steel is less than rubber for equal forces.

    Solutions

    Steel is more elastic than rubber. So, the Assertion is correct.

    It is also correct that deformation in steel is less than the rubber for equal forces. So, the reason is the correct explanation of the assertion.

     

  • Question 8/10
    1 / -0

    In the following questions, a statement of assertion (A) is followed by a statement of the reason (R)

    A: Air is more elastic than iron.

    R: Elasticity is directly proportional to Bulk modulus and the Bulk modulus of air is more than that of steel

    Solutions

    The Assertion is wrong because iron is more elastic than air.

    And the reason is also incorrect.

     

  • Question 9/10
    1 / -0

    In the following questions, a statement of assertion (A) is followed by a statement of the reason (R)

    A: Almost for all metals, the modulus of elasticity decreases with a rise in temperature.

    R: By increasing temperature, the intermolecular force decreases.

    Solutions

    The assertion is true because elasticity is inversely proportional to the temperature and the reason is also correct and the reason is the correct explanation of the assertion.

     

  • Question 10/10
    1 / -0

    A wire of length L, area of cross section A is hanging from a fixed support. The length of the wire changes to L1 when mass M is suspended from its free end. The expression for Young's modulus is:

    Solutions

     

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