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Assertion : If dot product and cross product of $\vec{P}$ and $\vec{Q}$ are zero, it implies that one of the vector $\vec{P}$ and $\vec{Q}$ must be null vector.
Reason : A null vector is a vector of zero magnitude.
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Reason : A null vector is a vector of zero magnitude.
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The correct answer is:
If both assertion and reason are true but reason is not the correct explanation of assertion.
As per question, $|\vec{A} \cdot \vec{B}|=|\vec{A} \times \vec{B}|=0$ This is possible if either $A=0$ or $B=0$. Magnitude of a null vector is zero.
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