MCQ On Class 11 Physics Chapter 2 Units and Measurements

(1) Light year is a unit of

[A] time

[B] distance

[C] sunlight intensity

[D] mass

Answer: distance

(2) The volume of a cube in m³ is equal to the surface area of the cube in m². The volume of the cube is

[A] 64 m³

[B] 216 m³

[C] 512 m³

[D] 196 m³

Answer: 216 m³

(3) If force (F), work (W) and velocity (v) are taken as fundamental quantities. What is the dimensional formula of time (T)?

[A] [WFv]

[B] [WFv-1]

[C] [W-1F -1v]

[D] [WF-1v -1]

Answer: [WF-1v -1]

(4) Physical quantities are

[A] quantities such as degrees, radians and steradians

[B] quantities such as length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity

[C] quantities such as pounds, dollars and rupees

[D] quantities such as kilos, pounds and gallons

Answer: quantities such as length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity

(5) The dimensions of kinetic energy is

[A] [M 2L2T]

[B] [ML 2T]

[C] [ML 2T-2]

[D] [ML 2T-1]

Answer: [ML 2T-2]

(6) Which of the following pairs has the same dimensions?

[A] specific heat and latent heat

[B] lmpulse and momentum

[C] surface tension and force

[D] moment of lnertia and torque

Answer: lmpulse and momentum

(7) A force F is given by F = at + bt², where t is time. What are the dimensions of a and b?

[A] MLT-1 and MLT0

[B] MLT-3 and ML2T4

[C] MLT-4 and MLT1

[D] MLT-3 and MLT-4

Answer: MLT-3 and MLT-4

(8) The atmospheric pressure is 106 dyne/cm². What is its value in SI unit?

[A] 105 newton/m²

[B] 106 newton/m²

[C] 104 newton/m²

[D] 103 newton/m²

Answer: 105 newton/m²

(9) In a system of units if force (F), acceleration (A) and time (T) are taken as fundamentals units then the dimensional formula of energy is

[A] FA2T

[B] FAT2

[C] FA2T

[D] FAT

Answer: FAT2

(10) The dimensions of kinetic energy is same as that of

[A] force

[B] pressure

[C] work

[D] momentum

Answer: work

(11) Which of the following units denotes the dimensions [ML2/Q2], where Q represents the electric charge?

[A] Wb/m²

[B] Henry(H)

[C] H/m²

[D] Weber(Wb)

Answer: Henry(H)

(12) Absolute error of the measurement is

[A] the difference between the individual measurement and the true value of the quantity cubed.

[B] the difference between the individual measurement and the true value of the quantity squared.

[C] the difference between two individual measurements and their mean

[D] the difference between the individual measurement and the true value of the quantity

Answer: the difference between the individual measurement and the true value of the quantity cubed.

(13) A particle starting from the origin (0, 0) moves in a straight line in the (x, y) plane. Its coordinates at a later time are the path of the particle makes with the x-axis an angle of

[A] 300

[B] 450

[C] 600

[D] 0

Answer: 600

(14) Which one of the following represents the correct dimensions of the coefficient of viscosity?

[A] [ML-1T-2]

[B] [MLT-1]

[C] [ML-1T-1]

[D] [ML-2T-2]

Answer: [ML-1T-1]

(15) In SI system the fundamental units are

[A] meter, kilogram, second, ampere, Kelvin, mole and candela

[B] meter, kilogram, second, coulomb, Kelvin, mole and candela

[C] meter, Newton, second, ampere, Kelvin, mole and candela

[D] meter, kilogram, second, ampere, Kelvin, mole and lux

Answer: meter, kilogram, second, coulomb, Kelvin, mole and candela

(16) Electron volt is a unit of

[A] charge

[B] potential difference

[C] energy

[D] magnetic force

Answer: energy

(17) Which of the following groups have different dimensions?

[A] Potential difference, EMF, voltage

[B] Pressure, stress, Youngs modulus

[C] Heat, energy, work done

[D] Dipole moment, electric flux, electric field

Answer: Dipole moment, electric flux, electric field

(18) ML-1T -2 is the dimensional formula of

[A] magnetic induction

[B] self-inductance

[C] electric potential

[D] electric field

Answer: magnetic induction

(19) What is the dimensional formula of magnetic field?

[A] MT-2A-1

[B] MT-1A-2

[C] M-1L-2TA-1

[D] M-1LTA-2

Answer: MT-2A-1

(20) Resolution is

[A] a measure of the bias in the instrument

[B] None of these

[C] the smallest amount of input signal change that the instrument can detect reliably

[D] a measure of the systematic errors

Answer: a measure of the systematic errors

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