NCERT Solutions for class 11 Physics | Chapter 2 - Units and Measurements

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Questions
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
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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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