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1.Units, Dimensions and Measurement
easy
$Assertion$ : The dimensional formula for relative velocity is same as that of the change in velocity.
$Reason$ : Relative velocity of $P$ w.r.t. $Q$ is the ratio of velocity of $P$ and that of $Q$.
AIf both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
BIf both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
CIf the Assertion is incorrect but the Reason is correct.
DIf the Assertion is correct but Reason is incorrect.
(AIIMS-2002)
Solution
Relative velocity which is vector subtraction of two velocities will also be a vector of the form of velocity so, its dimensional formula will remain unchanged. Relative velocity is measured not by calculating ratio but by calculating difference.
Standard 11
Physics
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Match List $-I$ with List $-II$
| List $-I$ | List $-II$ | ||
| $A$. | Coefficient of Viscosity | $I$. | $[M L^2T^{–2}]$ |
| $B$. | Surface Tension | $II$. | $[M L^2T^{–1}]$ |
| $C$. | Angular momentum | $III$. | $[M L^{-1}T^{–1}]$ |
| $D$. | Rotational Kinetic energy | $IV$. | $[M L^0T^{–2}]$ |
