# MCQ Chapter 2 Units and Measurement Class 11 Physics

Please refer to Units and Measurement MCQ Questions Class 11 Physics below. These MCQ questions for Class 11 Physics with answers have been designed as per the latest NCERT, CBSE books, and syllabus issued for the current academic year. These objective questions for Units and Measurement will help you to prepare for the exams and get more marks.

## Units and Measurement MCQ Questions Class 11 Physics

Please see solved MCQ Questions for Units and Measurement in Class 11 Physics. All questions and answers have been prepared by expert faculty of standard 11 based on the latest examination guidelines.

### MCQ Questions Class 11 Physics Units and Measurement

Question. The height of a man is 5.87532 ft. But measurement is correct upto three significant figures. The correct height is :
(a) 5.86 ft
(b) 5.87 ft
(c) 5.88 ft
(d) 5.80 ft

C

Question. 1.0×2.88 is equal to :
(a) 2.88
(b) 2,880
(c) 2.9
(d) none of these

C

Question. 4.32 x 2.0 is equal to :
(a) 8.64
(b) 8.6
(c) 8.60
(d) 8.640

B

Question. 4.338 + 4.835 x 3.88 + 3.0 is equal to :
(a) 10.6
(b) 10.59
(c) 10.5912
(d) 10.591267

A

Question. 1.00 x 2.88 is equal to:
(a) 2.88
(b) 2.880
(c) 2.9
(d) none of these

A

Question. The velocity of the body within the error limits, if a body travels uniformly a distance of (13.8 ± 0.2) m in a time (4.0 ± 0.3), is :
(a) (3.45 ± 0.2) m/s
(b) (3.45 ± 0.4) m/s
(c) (3.45 ± 0.3) m/s
(d) (3.45 ± 0.5) m/s

C

Question. While measuring the diameter of a wire by screw gauge, three readings were taken are 1.002 cm, 1.004 cm and 1.006 cm. The absolute error in the third reading is :
(a) 0.002 cm
(b) 0.004 cm
(c) zero
(d) 1.002 cm

A

Question. The optical path difference is defined as Δ x = 2π/λ What are dimensions of optical path difference ?
(a) [M0L-1 T0]
(b) [MLT0 ]
(c) [ML0T]
(d) [M L-2 T]

A

Question. The dimensions of wavelength is :
(a) [M0L0T0]
(b) [M0LT0]
(c) [M0L-1 T0]
(d) none of these

B

Question. The electric flux is given by scalar product of electric field strength and area. What are dimensions of electric flux?
(a) [ML3T-2A-2]
(b) [ML3T-2A-1]
(c) [ML3T-3A-1]
(d) [M2LT-1A0]

A

Question. Electric displacement is given by D = eE
Here, e = electric permittivity
E = electric field strength The dimensions of electric displacement is :
(a) [ML-2TA]
(b) [L-2T-1A]
(c) [L-2TA]
(d) none of these

C

Question. The unit of intensity of a wave is W/m ? What are dimensions of intensity of wave ?
(a) [M T -3]
(b) [A ML0T-2]
(c) [M0L-1T-2]
(d) None of these

A

Question. The dimensions of 1/2 eE are same as :
(a) energy density (energy per unit volume)
(b) energy .
(c) power
(d) none of the above

A

Question. The dimensions of heat capacity is :
(a) [L2T-2θ-1]
(b) [ML2T-2θ-1]
(c) [M-1L2T-2θ-1]
(d) none of these

B

Question. 1 mm of Hg pressure is equivalent to one torr and one torr is equivalent to 133.3 N/m2. The atmospheric pressure in mm of Hg pressure is :
(a) 70 mm
(b) 760 mm
(c) 3.76 mm
(d) none of these

B

Question. The number of molecules of H20 in 90 g of water is :
(a) 35.6 x 1023
(b) 41.22 x 1023
(c) 27.2 x 1023
(d) 30.11 x 1023

D

Question. The mass of earth is 5.98 x 1024 kg. The average atomic weight of atoms that make up Earth is 40 u. How many atoms are there in Earth ?
(a) 9 x l051
(b) 9 x 1049
(c) 9 x l046
(d) 9 x l055

B

Question. One amu is equivalent to 931 MeV energy. The rest mass of electron is 9.1 x 10-31 kg. The mass equivalent energy is (Here 1 amu = 1.67 x 10-27kg)
(a) 0.5073 MeV
(b) 0.693 MeV
(c) 4.0093 MeV
(d) none of these

A

Question. Electron volt is the unit of energy (1 eV = 1.6 x 10-19J ). In H-atom, the binding energy of electron in first orbit is 13.6 eV. The same in joule (J) is:
(a) 10 x l0-19 J
(b) 21.76 x l0-19 J
(c) 13.6 x 10 -19 J
(d) none of these

B

Question. One atomic mass unit in amu = 1.66 x 10-27 kg. The atomic weight of oxygen is 16. The mass of one atom of oxygen is :
(a) 26.56 x l0-27kg
(b) 10.53 x l0-27 kg
(c) 74x l0-27kg
(d) 2.73 x 10-27 kg

A

Question. One calorie of heat is equivalent to 4.2 J. One BTU (British thermal unit) is equivalent to 1055 J. The value of one BTU in calorie is :
(a) 251.2 cal
(b) 200 cal
(c) 263 cal
(d) none of these

A

Question. The value of universal gas constant is R = 8.3 J/kcal/mol. The value of R in atmosphere litre per kelvin/mol is :
(a) 8.12 atm litre/K mol
(b) 0.00812 atm litre/K mol
(c) 81.2 atm litre/K mol
(d) 0.0812 atm litre/K mol

D

Question. One horse power is equal to :
(a) 746 watt
(b) 756 watt
(c) 736 watt
(d) 766 watt

A

Question. Refer the data from above question. The value of R in calorie per °C mol is :
(a) 2 cal/mol °C
(b) 4 cal/mol °C
(c) 6 cal/mol °C
(d) 8.21 cal/mol °C

A

Question. One bar is equivalent to 105 N/m2. The atmosphere pressure is 1.013 x 105 N/m2 . The same in bar is :
(a) 1.88 bar
(b) 1.013 bar
(c) 2.013 bar
(d) none of these

B

Question. What are dimensions of Young’s modulus of elasticity ?
(a) [ML-1T-2]
(b) [MLT-2]
(c) [MLT-1]
(d) None of these

A

Question. The maximum static friction on a body is F = μN. Here, N = normal reaction force on the body μ. = coefficient of static friction The dimensions of p is :
(a) [MLT-2]
(b) [M0L0T0 θ-1]
(c) dimensionless
(d) none of these

C

Question. 1 revolution is equivalent to 360°. The value of 1 revolution per minute is :
(d) none of these

B

Question. The density of iron is 7.87 g/cm3. If the atoms are spherical and closely packed. The mass of iron atom is 9.27 x 10-26 kg; What is the volume of an iron atom ?
(a) 1.18 x 10-29 m
(b) 2.63 x 10-29 m3
(c) 1.73 x 10-2S m3
(d) 0.53 x 10-29 m3

A

Question. In the previous question, what is the distance between the centres of adjacent atoms ?
(a) 2.82 x 10 -9 m
(b) 0.282 x l0 -9 m
(c) 0.63 x 10 -9 m
(d) 6.33 x l0 -9 m

B

Question. The world’s largest cut diamond is the first star of Africa (mounted in the British Royal Sculpture and kept in the tower of London). Its volume is 1.84 cubic inch. What is its volume in cubic metre ?
(a) 30.2 x 10-6 m3
(b) 33.28 m3
(c) 4.8 m3
(d) None of these

A

Question. Crane is British unit of volume, (one crane = 170. 474 litre). Convert crane into SI unit:
(a) 0.170474 m3
(b) 17.0474 m3
(c) 0.0017474 m3
(d) 1704.74 m3

A

Question. Generally, sugar cubes are added to coffee. A typical sugar cube has an edge of length of 1 cm. Minimum edge length of a cubical box containing one mole of the sugar cubes is:
(a) 840 km
(b) 970 km
(c) 780 km
(d) 750 km

A

Question. The concorde is the fastest airlines used for commercial service. It can cruise at 1450 mile per hour (about two times the speed of sound or in other words, mach 2). What is it in m/s ?
(a) 644.4 m/s
(b) 80 m/s
(c) 40 m/s
(d) None of these

A

Question. The age of the universe is 5 x 1017 second. The age of universe in year is :
(a) 158 x 106
(b) 158 x l09
(c) 158 x 108
(d) 158 x 1011

C

Question. Assuming the length of the day uniformly increases by 0.001 second per century. The net effect on the measure of time over 20 centuries is :
(a) 3.2 hour
(b) 2.1 hour
(c) 2.4 hour
(d) 5 hour

B

Question. The acceleration of a car is 10 mile per hour second. The same in ft/s is :
(a) 1.467 ft/s2
(b) 14.67 ft/s2
(c) 40 ft/s2
(d) none of these

A

Question. One slug is equivalent to 14.6 kg. A force of 10 pound is applied on a body of one kg. The acceleration of the body is :
(a) 44.5 m/s2
(b) 4.448 m/s2
(c) 44.4 ft/s2
(d) none of these

A

Question. The time between human heart beat is 8 x 10-1 second. How many heart beats are measured in one minute ?
(a) 75
(b) 60
(c) 82
(d) 64

A

Question. Universal time is based on :
(a) rotation of earth on its axis
(b) oscillation of quartz crystal
(c) vibration of caesium atom
(d) earth’s orbital motion around the sun

A

Question. One nautical mile is 6080 ft. The same in kilometre is :
(a) 0.9 km
(b) 0.8 km
(c) 1.85 km
(d) none of these

C

Question. The area of a room is 10 m2 The same in ft2 is :
(a) 107.6 feet2
(b) 77 feet2
(c) 77.6 feet2
(d) none of these

A

Question. In the equation y = a sin (cot + kx), the dimensional formula of co is :
(a) [M°L°T-1
(b) [M°LT-1]
(c) [ML°T°]
(d) [M°L-1 T°]

A

Question. The dimensional formula of radius of gyration is :
(a) [M0L0 T°]
(c) [M0LT0]
(b) [M0L0T]
(d) none of these

C

Question. The numbers 2.745 and 2.735 on rounding off to 3 significant figures will give
(a) 2.75 and 2.74
(b) 2.74 and 2.73
(c) 2.75 and 2.73
(d) 2.74 and 2.74

D

Question. The radius of hydrogen atom in ground state is 5×10-11 m. The radius of hydrogen atom in fermi metre is (1 fm = 10-15 m):
(a) 5 x 104 fm
(b) 2 x 104 fm
(c) 5 x 102 fm
(d) 5 x 106 fm

A

Question. The dimensional formula Of the Hall coefficient is:
(a) [M0L0A-2T-1]
(b) [M0L3AJ]
(c) [M0L0 AT]
(d) [M0L3A-1T]

D

Question. The fractional error (Δx/x) if x = an is :

B

Question. Electron volt is a unit of
(a) charge
(b) potential difference
(c) energy
(d) magnetic force

C

Question. Light year is a unit of
(a) time
(b) distance
(c) sunlight intensity
(d) mass

B

Question. 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

C

Question. 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

B

Question. 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

B

Question. F energy (E), velocity (v) and force (F) are taken as fundamental quantities, what are the dimensions of mass?
(a) Ev2
(b) Ev -2
(c) Fv -1
(d) Fv -2

B

Question. Physical quantities are
(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

B

Question. Which of the following sets of quantities has the same dimensional formula?
(a) Frequency, angular frequency and angular momentum
(b) Surface tension, stress and spring constant
(c) Acceleration, momentum and retardation
(d) Work, energy and torque

D

Question. 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

D

Question. 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)

B

Question. Unit for a fundamental physical quantity is
(a) defined as best of various reference standards
(b) the smallest measurable value of the physical quantity
(c) defined as average various reference standards
(d) reference standard for the physical quantity

D

Question. If C and R denote capacitance and resistance respectively, what will be the dimensions of CxR?
(a) [M0L0TA0]
(b) [ML0TA-2]
(c) [ML0TA2]
(d) [MLTA-2]

A

Question. Fundamental or base quantities are arbitrary. In SI system these are
(a) length, force, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity
(b) length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity
(c) as length, mass, time, electric charge, thermodynamic temperature, amount of substance, and luminous intensity
(d) length, mass, force, electric current, thermodynamic temperature, amount of substance, and luminous intensity