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Assertion: An object can have constant s...

Assertion: An object can have constant speed but variable velocity.
Reason: Speed is a scalar but velocity is a vector quantity.

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 explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
A
Since velocity is a vector quantity, hence as its direction changes keeping magnitude constant, velocity is said to be changed. But for constant speed in equal time interval distance travelled should be equal.
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Knowledge Check

  • An object can have constatn speed but vartable velocity. Soeed is a scalar but velocity is a vector quantity.

    A
    (a) both Assertion and Reason are true and the Reason is correct explanation of the Assertion .
    B
    (b )both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
    C
    (C ) Assertion is true but the Reason is false.
    D
    (d) both Assertion and Reason are false.

  • Assertion : An object may have varying speed without having varying velocity. Reason : If the velocity is zero at an instant, the acceleration may not be zero at that instant.

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

  • Assertion: Two different planets have same escape velocity. Reason: Value of escape velocity is a universal constant.

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

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    A : Magnitude of mean velocity of the gas molecules is same as their mean speed. R : The only difference between mean velocity and mean speed is that mean velocity is a vector and mean speed is a scalar.

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