EWT | Academic Question

Questions
Question (1)
QN0035495

The force exerted by a special compression device is given as function of compression  as  for , where  is maximum possible compression and  is a constant. The force exerted by the device under compression is maximum when compression is -

  • (A)

    0

  • (B)

  • (C)

  • (D)

Correct Answer: D
Explanation:

at 

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Question (2)
QN0035496

The potential energy  between two atoms in a diatomic molecules as a function of the distance  between atoms has been shown in the figure. The atoms are 

  • (A)

    attracted when  lies between A and  and are repelled when  lies between  and 

  • (B)

    attracted when  lies between  and  and are repelled when  lies between  and

  • (C)

    are attracted when they reach  from 

  • (D)

    are repelled when they reach  from 

Correct Answer: B
Explanation:

The atoms when brought from infinity are attracted due to interatomic electrostatic force of attraction. At point , the potential energy is minimum and force of attraction is maximum. P.E. But if we bring atoms closer than , force of repulsion between two nucleii starts and P.E. increases.

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Question (3)
QN0035497

What is the phenomenon of temporary delay in regaining the original configuration by an elastic body, after the removel of a deforming force?

  • (A)

    Elastic fatigue

  • (B)

    Elasticity

  • (C)

    Plasticity

  • (D)

    Elastic after effect

Correct Answer: D
Explanation:

Elastic after effect is defined as the temporary delay in regaining the original configuration by an elastic body after the removal of a deforming force.

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Question (4)
QN0035498

When forces are applied on a body such that it is still in static equilibrium, then the extent to which the body gets deformed, depends on

  • (A)

    nature of the material

  • (B)

    magnitude of deforming force

  • (C)

    Both (a) & (b)

  • (D)

    None of these

Correct Answer: C
Explanation:

The deformation of a body on application of a force depends on the nature of the material and the magnitude of the applied force.

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