JEE MAIN - Physics (2025 - 7th April Evening Shift - No. 6)
Match List - I with List - II.
List - I | List - II |
---|---|
(A) Mass density | (I) [ML2T−3] |
(B) Impulse | (II) [MLT−1] |
(C) Power | (III) [ML2T0] |
(D) Moment of inertia | (IV) [ML−3T0] |
Choose the correct answer from the options given below :
Explanation
(A) Mass density:
Mass density is defined as mass per unit volume.
The dimension of mass is $$[M]$$.
The dimension of volume is $$[L^3]$$.
Therefore, the dimension of mass density is $$\frac{[M]}{[L^3]} = [ML^{-3}T^{0}]$$.
Matches with (IV).
(B) Impulse:
Impulse is defined as the change in momentum, or force multiplied by time.
Impulse = Force x Time
The dimension of force is $$[MLT^{-2}]$$.
The dimension of time is $$[T]$$.
Therefore, the dimension of impulse is $$[MLT^{-2}] \cdot [T] = [MLT^{-1}]$$.
Matches with (II).
(C) Power:
Power is defined as the rate of doing work or energy per unit time.
Power = Work / Time
The dimension of work (or energy) is $$[ML^2T^{-2}]$$.
The dimension of time is $$[T]$$.
Therefore, the dimension of power is $$\frac{[ML^2T^{-2}]}{[T]} = [ML^2T^{-3}]$$.
Matches with (I).
(D) Moment of inertia:
Moment of inertia is defined as $$I = mr^2$$, where m is mass and r is the distance from the axis of rotation.
The dimension of mass is $$[M]$$.
The dimension of distance squared is $$[L^2]$$.
Therefore, the dimension of moment of inertia is $$[ML^2T^{0}]$$.
Matches with (III).
So, the correct matches are:
(A) - (IV)
(B) - (II)
(C) - (I)
(D) - (III)
Therefore, the correct option is D.
Comments (0)
