Dimensional Formulae and Equations

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Dimensional Formulae and Equations: Overview

This topic contains concepts like Dimensions, Dimensions of Fundamental Quantities, Dimensional Formula of Derived Quantities, and Quantities with Same Dimensions.

Important Questions on Dimensional Formulae and Equations

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Dimensional formula for linear momentum is

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Why dimensional methods are applicable only up to three quantities?

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If humans were to settle on other planets which of the fundamental quantities will be in trouble? Why?

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A quantity X is defined as: X=YZ. If  Y=MLT-2Z=L2. Find the dimensions of quantity X. Identify this physical quantity.

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The dimensions of pressure are same as that of

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Candela is used to express electric field intensity.

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Name one dimensional constant.
(Joule's constant/ Universal gas constant)

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Dimensional formula for linear momentum is

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If velocity of light c, Planck’s constant h and gravitational constant G are taken as fundamental quantities then the dimensions of length will be

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Match the units in Column I with their corresponding dimensional formula in Column II .

  Column - I
(Units)
  Column - II
(Dimensional formulae)
(A) Pa s (p) M0L2T-2K-1
(B)  N m K-1 (q) MLT-3K-1
(C) J kg-1K-1 (r) ML-1T-1
(D) W m-1K-1 (s) ML2T-2K-1

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Which of the following sets have different dimensions?

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If P, Q, R are three physical quantities, having different dimensions, which of the following combinations can never be a meaningful quantity?

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Choose among the pairs listed below, the one which has the same dimension.

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The dimensional formula (in S.I.) of the quantity LCVR (where C= capacitance, V= voltage & R= resistance)

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Select the dimensional formula of B22μ0. Here B is the magnetic field and μ0 is the permeability of the free space.

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The dimensional formula of capacitance is _____. Take Q as the dimension formula of charge.

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Match the following.
 

A. Angular momentum 1. M-1L2T-2
B.  Torque 2. M1T-2
C. Gravitational constant 3. M1L2T-2
D. Tension 4. M1L2T-1

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The dimensional formula for inductance is

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Which of the following equation is dimensionally incorrect?

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The dimensional formula of action =(energy×time) is