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Elasticity Test - 3

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Elasticity Test - 3
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Weekly Quiz Competition
  • Question 1
    1 / -0

    A wire whose cross-section area is A1 is stretched by L1 by a certain weight. How far will a wire of same material and same length and cross-section area A2 stretch if same weight is applied to it

    Solution

     

  • Question 2
    1 / -0

    The material which practically does not show elastic after effect is 

    Solution

     When a elastic body is stretched and applied deforming force is removed then the body is expected to return to its original configuration instantaneously. But sometimes some materials take some time to return to its original configuration. This temporary delay in achieving its original configuration is termed as elastic after effect. This elastic after effect is very short for quartz fiber. But elastic after effect is more for glass. 

     

  • Question 3
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    The relationship between Young's modulus Y, Bulk modulus K and modulus of rigidity n is

    Solution

     

  • Question 4
    1 / -0

    Why the spring is made up of steel in comparison of copper?

    Solution

    Springs are designed based on the property of elasticity. In the spring the restoring force develops due to deformation. This deformation depends on the elasticity of a material. In the given materials steel is more elastic than copper. So steel is preferred to manufacture a spring.

     

  • Question 5
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    The quality of the material which opposes the change in shape, volume or length is called

    Solution

    Elasticity of a material resists change in shape, size, and volume of material.

     

  • Question 6
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    Which one of the following substances possesses the highest elasticity:

    Solution

    Modulus of elasticity gives the idea of elasticity, and steel has the highest modulus of elasticity.

     

  • Question 7
    1 / -0

    Which of the following affects the elasticity of a substance

    Solution

     

    The elasticity of substance is affected by impurity of substance hammering and anneasing change  in  the temperature.

     

  • Question 8
    1 / -0

    The Young's modulus of the material of a wire is 6×1012N/m2 and  there is no transverse strain in it, then its modulus of rigidity will be

    Solution

     

  • Question 9
    1 / -0

    The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied?

    Solution

    Change in length of a wire when tension is applied is given by,

    Δ L/L = Mg/YA

    Δ L = MgL/YA

    Δ L ∝ L/A

    To have the largest extension, the length should be larger and area should smaller.

     

  • Question 10
    1 / -0

    When a block of mass M is suspended by a long wire of length L, the length of the wire becomes (L+l). The elastic potential energy stored in the extended wire is:

    Solution

     

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