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Statement-1: A person walking on a horiz...

Statement-1: A person walking on a horizontal road with a load on his head does no work on the load against gravity.
Statement-2: No work is said to be done, it directions of force and displacement of load are perpendicular to each other.

A

Statement-1 is true, Statement-2: is true, Statement-2 is a correct explanation for Statement-1.

B

Statement-1 is true, Statement-2: is true, Statement-2 is NOT a correct explanation for Statement-1.

C

Statement-1 is true, Statement-2 is false

D

Statement-1 is false, Statement-2 is true

Text Solution

Verified by Experts

The correct Answer is:
A
`W=FS cos theta`, if `theta=90^(@)` then `W=0`
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Knowledge Check

  • Assertion : A person working on a horizontal road with a load on his head does no work. Reason : No work is said to be done, if directions of force and displacement of load are perpendicular to each other.

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

  • Assertion (A): Centripetal force does no work . Reason (R) : Force and displacement are perpendicular to each other

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

  • Statement-I : A point charge Q is rotated in a circle of radius r around a charge q. The work done will be zero. Statement-II : For this motion the force is along the radius and direction of motion is perpendicular

    A
    If both Statement-I and Statement-II are true, and Statement-II is the correct explanation of Statement -I.
    B
    If both Statement-I and Statement-II are true but Statement-II is not the correct explanation of Statement -I.
    C
    If Statement -I is true but Statement-II is false
    D
    If Statement-I is false but Statement -II is true

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