Engineering Entrance Sample Papers

# JEE Mains Questions on Units, Dimensions, Measurement ## JEE Units and Dimensions (Physics)

 Question 1
Unit of energy in SI system is
 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

Related: JEE Physical World (Physics)

 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
 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. 