# MCQs For NCERT Class 11 Physics Chapter 2 Units And Measurement

Please refer to the MCQ Questions for Class 11 Physics Chapter 2 Units And Measurement with Answers. The following Units And Measurement Class 11 Physics MCQ Questions have been designed based on the latest syllabus and examination pattern for Class 11. Our experts have designed MCQ Questions for Class 11 Physics with Answers for all chapters in your NCERT Class 11 Physics book.

## Units And Measurement Class 11 MCQ Questions with Answers

See below Units And Measurement Class 11 Physics MCQ Questions, solve the questions and compare your answers with the solutions provided below.

Question. P represents radiation pressure, c represents speed of light and S represents radiation energy striking per unit area per sec. The non zero integers x, y, z such that PxSycz is dimensionless are
(a) x = 1, y = 1, z = 1
(b) x = –1, y = 1, z = 1
(c) x = 1, y = –1, z = 1
(d) x = 1, y = 1, z = –1

C

Question. The frequency of vibration f of a mass m suspended from a spring of spring constant k is given by a relation f = amxky, where a is a dimensionless constant. The values of x and y are
(a) x = 1/2 y =1/2
(b) x = -1/2 y = -1/2
(c) x = 1/2 y = -1/2
(d) x = -1/2 y = 1/2

D

Question. If x = at + bt2, where x is the distance travelled by the body in kilometers while t is the time in seconds, then the units of b is
(a) km/s
(b) km s
(c) km/s2
(d) km s2

C

Question. The _____ is a measure of how closed the measured value is to the true value of quantity.
(a) Precision
(b) accuracy
(c) Error
(d) None of these

B

Question. When two quantities are divided, the relative error in the result is given by
(a) the product of the relative error in the individual quantities
(b) the quotient of the relative error in the individual quantities
(c) the difference of the relative error in the individual quantities
(d) the sum of the relative error in the individual quantities

D

Question. The pitch and the number of circular scale divisions in a screw gauge with least count 0.02 mm are respectively
(a) l mm and 100
(b) 0.5 mm and 50
(c) 1 mm and 50
(d) 0.5 mm and 100

C

Question. Which one of the following pairs of quantities and their units is a proper match?
(a) Impulse – N/sec
(b) Magnetic flux – weber
(d) Capacitance – henry

B

Question. One second is defined to be equal to
(a) 1650763.73 periods of the krypton clock
(b) 652189.63 periods of the krypton clock
(c) 1650763.73 periods of the cesium clock
(d) 9192631770 periods of the cesium clock

D

Question. One yard in SI unit is equal to
(a) 1.9144 metre
(b) 0.9144 metre
(c) 0.09144 kilometre
(d) 1.0936 kilometre

B

Question. One pico farad is equal to

C

Question. ‘Torr’ is the unit of
(a) pressure
(b) volume
(c) density
(d) flux

A

Question. Very large distances such as the distance of a Planet or a star from Earth can be measured by
(a) Spectrograph
(b) Millikan’s oil drop method
(c) Parallax method
(d) All of these

C

Question. Joule second is a unit of
(a) energy
(b) torque
(c) power
(d) angular momentum

D

Question. Temperature can be expressed as derived quantity in terms of
(a) length and mass
(b) mass and time
(c) length, mass and time
(d) None of these

D

Question. One unified atomic mass unit is equal to
(a) 12 times the mass of one carbon-12 atom
(b) 1/12 of the mass of 12 atoms of C-12
(c) 1/12 of the mass of one atom of C-12
(d) 12 times the mass of 12 atoms of C-12

C

Question. Match the columns I and II
Column I                              Column II
(B) Base unit                          (2) light year
(C) Derived unit                      (3) kg-ms–1
(D) Complementary unit          (4) second
(a) (A)→(4); (B)→(2); C→(1); (D)→(3)
(b) (A)→(2); (B)→(4); C→(3); (D)→(1)
(c) (A)→(3); (B)→(2); C→(4); (D)→(1)
(d) (A)→(2); (B)→(4); C→(1); (D)→(3)

B

Question. Light year is
(a) light emitted by the sun in one year.
(b) time taken by light to travel from sun to earth.
(c) the distance travelled by light in free space in one year.
(d) time taken by earth to go once around the sun.

C

Question. The unit of the coefficient of viscosity in S.I. system is
(a) m/kg-s
(b) m-s/kg2
(c) kg/m-s2
(d) kg/m-s

D

Question. The unit of the Stefan-Boltzmann’s constant is
(a) W/m2K4
(b) W/m2
(c) W/m2K
(d) W/m2K2

A

Question. The wrong unit conversion among the following is
(a) 1 angstrom = 10–10m
(b) 1 fermi = 10–15m
(c) 1 light year = 9.46 × l015m
(d) 1 astronomical unit = 1.496 × 10–11m

D

Question. Unit of specific resistance is
(a) ohm/m2
(b) ohm m3
(c) ohm – m
(d) ohm/m

C

Question. Unit of magnetic moment is
(a) ampere–metre2
(b) ampere–metre
(c) weber–metre2
(d) weber/metre

A

Question. Surface tension of a liquid is 70 dyne/cm. Its value in SI is
(a) 70 N/m
(b) 7 × 10–2 N/m
(c) 7 × 102 N/m
(d) 7 × 103 N/m

B

Question. Assertion : When we change the unit of measurement of a quantity, its numerical value changes.
Reason : Smaller the unit of measurement smaller is its numerical value.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct.

C

Question. The dimensional formula for magnetic flux is
(a) [ML2T–2A–1]
(b) [ML3T–2A–2]
(c) [M0L–2T2A–2]
(d) [ML2T–1A2]

A

Question. The dimensions of magnetic field in M, L, T and C (coulomb) is given as
(a) [MLT–1 C–1]
(b) [MT2 C–2]
(c) [MT–1 C–1]
(d) [MT–2 C–1]

C

Question. The dimensions of coefficient of self inductance are
(a) [ ML2 T–2 A–2 ]
(b) [ ML2 T–2 A–1 ]
(c) [ MLT–2 A–2 ]
(d) [ MLT–2 A–1 ]

A

Question. Which of the following represents incorrect unit?
(a) Pressure = N/m2
(b) Surface tension = N/m
(c) Energy = kg-m/sec
(d) Stress / Strain=N/m2

C

Question. Which of the following is the unit of molar gas constant?
(a) JK–1 mol–1
(b) Joule
(c) JK–1
(d) J mol–1

A

Question. Number of fundamental units in SI system is
(a) 4
(b) 7
(c) 3
(d) 5

B

Question. Which one of the following is not measured in units of energy ?
(a) Couple × angle
(b) Moment of inertia × (angular velocity)2
(c) Force × distance
(d) Impulse × time

D

Question. The numerical values of young’s modulus in S.I. unit is b.
What is its numerical value in cgs system?
(a) b
(b) 10b
(c) b/10
(d) 100 b

B

Question. In equation, r = m2 sin pt , where t represents time. If the unit of m is N, then the unit of r is
(a) N
(b) N2
(c) Ns
(d) N2s

B

Question. If x = at + bt2, where x is the distance travelled by the body in kilometers while t is the time in seconds, then the unit of b is
(a) km/s
(b) kms
(c) km/s2
(d) kms2

C

Question. The unit of permittivity of free space, eo is
(a) coulomb2/(newton-metre)2
(b) coulomb/newton-metre
(c) newton-meter2/coulomb2
(d) coulomb2/newton-metre2

D

Question. E, m, J and G denote energy, mass, angular momentum and  gravitational constant respectively, then the unit of EJ2 /m3G2 is
(a) newton
(b) metre
(c) kilogram
(d) second

D

Question. The correct unit of thermal conductivity is
(a) Jm–2 sec–1(oC)–1
(b) Jm–1 sec–1(oC)–2
(c) J-sec
(d) Jm–1 sec–1(oC)–1

D

Question. If unit of length and force are increased 4 times. The unit of energy
(a) is increased by 4 times
(b) is increased by 16 times
(c) is increased by 8 times
(d) remains unchanged

B

Question. The density of a material in CGS system of units is 4g/cm3. In a system of units in which unit of length is 10 cm and unit of mass is 100 g, the value of density of material will be
(a) 0.4
(b) 40
(c) 400
(d) 0.04

B

Question. Dimensional analysis can be applied to
(a) check the dimensional consistency of equations
(b) deduce relations among the physical quantities
(c) to convert from one system of units to another
(d) All of these

D

Question. The dimensional formula for relative density is
(a) [ML–3]
(b) [MoL–3]
(c) [MoLoT–1]
(d) [MoLoTo]

D

Question. The dimensions of speed and velocity are
(a) [L2T], [LT–1]
(b) [LT–1], [LT –2]
(c) [LT], [LT]
(d) [LT–1], [LT –1]

D

Question. The physical quantity that has no dimensions is
(a) strain
(b) angular velocity
(c) angular momentum
(d) linear momentum

A

Question. Which is dimensionless?
(a) Force/acceleration
(b) Velocity/acceleration
(c) Volume/area
(d) Energy/work

D

Question. Dimensions of specific heat are
(a) [ML2 T–2 K]
(b) [ML2 T–2 K–1]
(c) [ML2 T2 K–1]
(d) [L2 T–2 K–1]

D

Question. The dimensions of torque are
(a) [MLT–2]
(b) [ML2T–2]
(c) [ML2T–1]
(d) [M2L2T–2]

B

Question. The division of energy by time is X. The dimensional formula of X is same as that of
(a) momentum
(b) power
(c) torque
(d) electric field

B

Question. Which of the following is a dimensional constant?
(a) Refractive index
(b) Dielectric constant
(b) Relative density
(d) Gravitational constant

D

Question. The dimensions of mobility are
(a) [M–2T2A]
(b) [M–1T2A]
(c) [M–2T3A]
(d) [M–1T3A]