Engineering Entrance Sample Papers

JEE Mains Questions on Units, Dimensions, Measurement

units and dimensions questions
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JEE Units and Dimensions (Physics)

Question 1
Unit of energy in SI system is

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A
Calorie
B
Electron volt
C
Erg
D
Joule
Question 2
Young's modulus of a material has the same units as
A
Pressure
B
Compressibility
C
Force
D
Strain
Question 3
Which of the following is dimensionally correct?
A
Pressure = Momentum per unit volume per unit time
B
Pressure = Force per unit volume
C
Pressure = Energy per unit area
D
Pressure = Energy per unit volume
Question 4
Which is the correct unit for measuring nuclear radii
A
Fermi
B
Angstrom
C
Micron
D
Millimetre
Question 5
Temperature can be expressed as a derived quantity in terms of any of the following
A
Length and mass
B
None of these
C
Mass and time
D
Length, mass and time
Question 6
In which of the following systems of unit, Weber is the unit of magnetic flux
A
None of these
B
CGS
C
MKS
D
SI
Question 7
In C.G.S. system the magnitude of the force is 100 dynes. In another system where the fundamental physical quantities are kilogram, metre and minute, the magnitude of the force is
A
0.036
B
36
C
0.36
D
3.6
Question 8
Which of the following is not the unit of time?
A
Leap year
B
Micro second
C
Lunar months
D
Parallactic second
Question 9
Universal time is based on
A
Oscillations of quartz crystal
B
Rotation of the earth on its axis
C
Earth's orbital motion around the earth
D
Vibrations of cesium atom
Question 10
What is the SI unit of permeability
A
Henry per metre
B
Tesla metre per ampere
C
Weber per ampere metre
D
All the above units are correct
Question 11
Which of the following pairs of physical quantities has the same dimensions?
A
Work and power
B
Work and energy
C
Momentum and energy
D
Force and power
Question 12
Henry/ohm can be expressed in

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A
Second
B
Mho
C
Metre
D
Coulomb
Question 13
Of the following quantities, which one has dimensions different from the remaining three
A
Force per unit area
B
Product of voltage and charge per unit volume
C
Angular momentum per unit mass
D
Energy per unit volume
Question 14
Dimensions of the following three quantities are the same
A
Potential energy, kinetic energy, momentum
B
Work, energy, force
C
Pressure, stress, coefficient of elasticity
D
Velocity, momentum, impulse
Question 15
Which physical quantities have the same dimension?
A
Work and power
B
Latent heat and specific heat
C
Force and power
D
Couple of force and work
Question 16
Which of the following quantities has the same dimensions as that of energy?
A
Work
B
Momentum
C
Force
D
Power
Question 17
Which of the following is not a unit of energy
A
W - s
B
Joule
C
kg – m /sec
D
N - m
Question 18
The dimensional formula for impulse is same as the dimensional formula for

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A
Torque
B
Momentum
C
Rate of change of momentum
D
Force
Question 19
The foundations of dimensional analysis were laid down by
A
Fourier
B
Gallileo
C
Joule
D
Newton
Question 20
Wavelength of ray of light is 0.00006 m. It is equal to
A
600 microns
B
0.6 microns
C
6 microns
D
60 microns
Question 21
Light year is a unit of
A
Distance
B
Time
C
Mass
D
Energy
Question 22
Which of the following system of units is not based on units of mass, length and time alone?
A
MKS
B
CGS
C
SI
D
FPS
There are 22 questions to complete.
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