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Q.

Statement (A): Dimensional formula for area is[M0L2T0

Statement (B) : Dimensional formula for speed is [M0L1T-1]

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a

Both A and B are true

b

Both A and B are false

c

A is true but B is false

d

A is false but B is true

answer is A.

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Detailed Solution

The dimensional formula of a physical quantity is a way to represent it in terms of the basic dimensions of mass [M], length [L], and time [T]. Let us analyze the given statements:

Statement (A): Dimensional formula for area is [M0L2T0].

  • Area refers to the extent of a two-dimensional surface and is calculated as the product of two lengths (e.g., length × breadth for a rectangle).
  • Since the unit of length is L, the dimensional formula for area becomes L × L = L2.
  • There is no involvement of mass or time in the calculation of area, so the powers of M and T are zero.
  • Thus, the area dimensional formula is [M0L2T0], which is correct.

Statement (B): Dimensional formula for speed is [M0L1T-1].

  • Speed is defined as the distance traveled per unit time. Its formula is: Speed = Distance / Time.
  • The dimensional formula for distance is [L], and for time, it is [T].
  • Dividing L by T, the dimensional formula for speed becomes [L1T-1].
  • Like area, speed does not depend on mass, so the power of M is zero.
  • Therefore, the dimensional formula for speed is [M0L1T-1], which is also correct.
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