Dimensional Analysis and Its Applications

IMPORTANT

Dimensional Analysis and Its Applications: Overview

This topic consists of various concepts like Dimensional Checking of Equations,Deriving Relations Dimensionally,Conversion of Units Dimensionally, etc.

Important Questions on Dimensional Analysis and Its Applications

MEDIUM
IMPORTANT

The dimensions of  ( μ 0 ε 0 ) 1 2 are

MEDIUM
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The dimensions of    ( μ 0 ε 0 ) 1 2 are

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The ratio of the dimensions of Planck’s constant and that of the moment of inertia has the dimensions of

EASY
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The force F on a sphere of radius a moving in a medium with velocity v is given by   F=6πηav.  The dimensions of   η  are

MEDIUM
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The frequency of vibration f of a mass m suspended from a spring of spring constant k is given by a relation of the type f=cmxky , where c is a dimensionless constant. The values of x and y are:

EASY
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If    x=at+b t 2 ,  where x is the distance travelled by the body in kilometres while t is the time in seconds, then the unit of b is:

EASY
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Of the following quantities, which one has dimension different from the remaining three?

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Dimensional formula of self inductance is:

MEDIUM
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If C and R denote capacitance and resistance respectively, then the dimensional formula of CR is

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Which of  the following is a dimensional constant?

EASY
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In a particular system, the unit of  length, mass and time are chosen to be 10 cm. 10 g and  0.1 s respectively. The unit of force in this system will be equivalent to

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P represents radiation pressure, c represents speed of light and S represents radiation energy striking unit area per sec. The non zero integers x, y, z such that  PxSycz is dimensionless are:

EASY
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Dimensions of 1 μ 0 ε 0 ,where symbols have their usual meaning, are

MEDIUM
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Pressure depends on distance as P=α β exp-αzkθ, where α,β are constants z is distance, k is Boltzman's constants and θ is temperature. The dimension of β are

EASY
IMPORTANT

Which of the following can be a set of fundamental quantities?

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In the equation X+aY2[Y-b]=RT, X is pressure, Y is volume, R is universal gas constant and T is temperature. The physical quantity equivalent to the ratio ab is:

 

EASY
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The speed of a wave produced in water is given by ν=λagbρc. Where λ, g and ρ are wavelength of wave, acceleration due to gravity and density of water respectively. The values of a, b and c respectively, are

EASY
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If force (F), velocity (V) and time (T) are considered as fundamental physical quantity, then dimensional formula of density will be :

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Match List I with List II

  List I   List II
A. Torque I. M L-2 T-2
B. Stress II. M L2 T-2
C. Pressure gradient III. M L-1 T-1
D. Coefficient of
viscosity
IV. M L-1 T-2
Choose the correct answer from the options given below :

EASY
IMPORTANT

The velocity u of particles is given in terms of time t by the equation u=at+bt2+c. The dimension of a, b & c are