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NEET
Exam
NEET
Subject
Physics
Chapter
Units and Dimensions

NEET · Physics · Units and Dimensions

Match List-I with List-II, where List-II gives the dimensional...

Match List-I with List-II, where List-II gives the dimensional formulas of the physical quantities in List-I when Energy (EE), Momentum (PP), and Force (FF) are chosen as the fundamental quantities.

List-IList-II
(A) Mass(I) [EF−1][E F^{-1}]
(B) Time(II) [P2E−1][P^2 E^{-1}]
(C) Length(III) [E−1F2][E^{-1} F^2]
(D) Surface Tension(IV) [PF−1][P F^{-1}]

Choose the correct answer from the options given below:

Options

  1. A(A)-(II), (B)-(I), (C)-(IV), (D)-(III)
  2. B(A)-(III), (B)-(IV), (C)-(I), (D)-(II)
  3. C(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
  4. D(A)-(II), (B)-(IV), (C)-(I), (D)-(III)

Correct answer

D. (A)-(II), (B)-(IV), (C)-(I), (D)-(III)

Step-by-step solution

Let us express the standard fundamental quantities (Mass, Length, Time) in terms of Energy (EE), Momentum (PP), and Force (FF).

The standard dimensional formulas are:
[E]=[ML2T−2][E] = [ML^2 T^{-2}]
[P]=[MLT−1][P] = [MLT^{-1}]
[F]=[MLT−2][F] = [MLT^{-2}]

To find Length (LL):
[E][F]=[ML2T−2][MLT−2]=[L]\dfrac{[E]}{[F]} = \dfrac{[ML^2 T^{-2}]}{[MLT^{-2}]} = [L]
So, [L]=[EF−1][L] = [E F^{-1}]. This matches (C) with (I).

To find Time (TT):
[P][F]=[MLT−1][MLT−2]=[T]\dfrac{[P]}{[F]} = \dfrac{[MLT^{-1}]}{[MLT^{-2}]} = [T]
So, [T]=[PF−1][T] = [P F^{-1}]. This matches (B) with (IV).

To find Mass (MM):
Since kinetic energy E=P22ME = \dfrac{P^2}{2M}, we have M∝P2EM \propto \dfrac{P^2}{E}.
Dimensionally, [P]2[E]=[M2L2T−2][ML2T−2]=[M]\dfrac{[P]^2}{[E]} = \dfrac{[M^2 L^2 T^{-2}]}{[ML^2 T^{-2}]} = [M].
So, [M]=[P2E−1][M] = [P^2 E^{-1}]. This matches (A) with (II).

To find Surface Tension:
Surface Tension = ForceLength=[F][L]\dfrac{\text{Force}}{\text{Length}} = \dfrac{[F]}{[L]}
Substituting [L]=[EF−1][L] = [E F^{-1}]:
[Surface Tension]=[F][EF−1]=[E−1F2][\text{Surface Tension}] = \dfrac{[F]}{[E F^{-1}]} = [E^{-1} F^2]. This matches (D) with (III).

Thus, the correct matching is (A)-(II), (B)-(IV), (C)-(I), (D)-(III).

Answer: (A)-(II), (B)-(IV), (C)-(I), (D)-(III)
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