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Assertion : If we apply force to a lump ...

Assertion : If we apply force to a lump of putty or mud, they have no gross tendency to regain their previous shape.
Reason : This type of substances are called plastic substances.

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Knowledge Check

  • If a force is applied to a plastic substance, then I. they have no gross tendency to regain their original shape. III permanently deformed, there have tendency to regain their original shape. not permanently deformed. Which of the following statements(s) is/are correct?

    A
    Only I
    B
    Only III
    C
    I and II
    D
    III and IV

  • Assertion: We can apply tau=I alpha about the centre of mass of the system in non-inertial frame of reference. Reason: Torque of pseudo forces about centre of mass is zero

    A
    If both assertion and reason are correct and reason is the correct explanation of the assertion.
    B
    If both assertion and reason are correct but reason is not the correct explanation of assertion
    C
    If assertion is correct but reason is incorrect.
    D
    If assertion is incorrect but reason is correct

  • Assertion : The magnetic effects of magnet can pass through the screens of substances such as plastic, paper, glass etc. Reason : A magnet when brought near a plastic ruler, it attracts the plastic ruler towards it.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion .
    B
    If both assertion and reason are true but reason is not the correct explation of assertion.
    C
    If assertion is true but reason is false
    D
    If assertion is false but reason is true.

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    Assertion : Diamagnetic substances are not attracted by magnetic field. Reason : Diamagnetic substances have no unpaired electrons.

    Materials get deformed when force is applied. Some of them regain their status when the applied force is removed. They are termed as elastic. Those of which not regaining are called plastic. There may be delay in the regaining in some materials. They are said to have got elastic aftereffect, since they have gone beyond the elastic limit. Repeated application and removal of force leads to fatigueness in the material. Fatigued materials may break at any point time and so are avoided. The stress strain graph for two materials A and B is shown in the following figure: The strength of the material A and B is S_(A) and S_(B) , respectively, while the longevity of plastic behaviour is L_(A) and L_(B) . Then

    Materials get deformed when force is applied. Some of them regain their status when the applied force is removed. They are termed as elastic. Those of which not regaining are called plastic. There may be delay in the regaining in some materials. They are said to have got elastic aftereffect, since they have gone beyond the elastic limit. Repeated application and removal of force leads to fatigueness in the material. Fatigued materials may break at any point time and so are avoided. The stress strain graph for two materials A and B is shown in the following figure: The time in which the two materials regain their original status is t_(A) and t_(B) related as t_(B)=2t_(B) . Then the material under elastic aftereffect (relatively) is

    Materials get deformed when force is applied. Some of them regain their status when the applied force is removed. They are termed as elastic. Those of which not regaining are called plastic. There may be delay in the regaining in some materials. They are said to have got elastic aftereffect, since they have gone beyond the elastic limit. Repeated application and removal of force leads to fatigueness in the material. Fatigued materials may break at any point time and so are avoided. The stress strain graph for two materials A and B is shown in the following figure: If the intensity of A and B is E_(A) and E_(B) , respectively

    Assertion:During the period of water deprivation of on the desert, the camel utilizes water stored in the hump on its back Reason:Fatty substance occurring in the hump of the camel following metabolism yield water called 'metabolic water '

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