Q.

Assertion (A) : A physical quantity cannot be called as a vector if its magnitude is zero

            Reason (R) : A vector has both magnitude and direction

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a

A is incorrect and R is correct

b

Both A and R are correct and R is the correct explanation of A

c

A is correct and R is incorrect

d

Both A and R are correct , but R is not the correct explanation of A

answer is D.

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Detailed Solution

A, B, C are wrong because Assertion is not correct.

   Actually , if magnitude of vector is zero then it called null vector.

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Assertion (A) : A physical quantity cannot be called as a vector if its magnitude is zero            Reason (R) : A vector has both magnitude and direction