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

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Free download in PDF Class 11 Physics Chapter 2 Units And Measurements Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 11 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>

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(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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