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Measurement MCQs for NEET — Physics Questions with Answers

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The dimensional formula of angular velocity is

$M^{0} L^{0} T^{- 1}$

$M L T^{- 1}$

$M^{0} L^{0} T^{1}$

$M L^{0} T^{- 2}$

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Explanation

Angular velocity = $\frac{θ}{t},$ $[ω] = \frac{[M^{0} L^{0} T^{0}]}{[T]} = [T^{- 1}]$

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The dimensions of power are

$M^{1} L^{2} T^{- 3}$

$M^{2} L^{1} T^{- 2}$

$M^{1} L^{2} T^{- 1}$

$M^{1} L^{1} T^{- 2}$

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Explanation

Power = $\frac{Work done}{Time} = [\frac{M L^{2} T^{- 2}}{T}] = [M L^{2} T^{- 3}]$

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The dimensions of couple are

$M L^{2} T^{- 2}$

$M L T^{- 2}$

$M L^{- 1} T^{- 3}$

$M L^{- 2} T^{- 2}$

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Explanation

Couple = Force × Arm length = $[M L T^{- 2}] [L] = [M L^{2} T^{- 2}]$

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Dimensional formula for angular momentum is

$M L^{2} T^{- 2}$

$M L^{2} T^{- 1}$

$M L T^{- 1}$

$M^{0} L^{2} T^{- 2}$

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Explanation

Angular momentum = mvr

$= [M L T^{- 1}] [L] = [M L^{2} T^{- 1}]$

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The dimensional formula for impulse is

$M L T^{- 2}$

$M L T^{- 1}$

$M L^{2} T^{- 1}$

$M^{2} L T^{- 1}$

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Explanation

Impulse = Force × Time = $[M L T^{- 2}] [T] = [M L T^{- 1}]$

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The dimensional formula for the modulus of rigidity is

$M L^{2} T^{- 2}$

$M L^{- 1} T^{- 3}$

$M L^{- 2} T^{- 2}$

$M L^{- 1} T^{- 2}$

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Explanation

Modulus of rigidity = $\frac{Shear stress}{Shear strain} =$ $[M L^{- 1} T^{- 2}]$

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The dimensional formula for r.m.s. (root mean square) velocity is

$M^{0} L T^{- 1}$

$M^{0} L^{0} T^{- 2}$

$M^{0} L^{0} T^{- 1}$

$M L T^{- 3}$

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Explanation

$M^{0} L T^{- 1}$

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The dimensional formula for Planck's constant (h) is

$M L^{- 2} T^{- 3}$

$M L^{2} T^{- 2}$

$M L^{2} T^{- 1}$

$M L^{- 2} T^{- 2}$

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Explanation

$E = h v \Rightarrow [M L^{2} T^{- 2}] = [h] [T^{- 1}] \Rightarrow [h] = [M L^{2} T^{- 1}]$

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The dimensional formula for impulse is same as the dimensional formula for

Momentum

Force

Rate of change of momentum

Torque

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Explanation

Momentum = $m v = [M L T^{- 1}]$

Impulse = Force × Time = $[M L T^{- 2}] \times [T] = [M L T^{- 1}]$

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Which of the following is dimensionally correct

Pressure = Energy per unit area

Pressure = Energy per unit volume

Pressure = Force per unit volume

Pressure = Momentum per unit volume per unit time

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Explanation

Pressure = $\frac{Force}{Area} = \frac{Energy}{Volume}$ = $M L^{- 1} T^{- 2}$

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