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MCQs on Class 11 Physics Chapter 2

By Swati Singh

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Updated on 6 Oct 2025, 17:27 IST

Class 11 Physics Chapter 2 – Units and Measurements MCQs with answers are available here. These questions are prepared as per the latest CBSE syllabus and NCERT guidelines. Practicing these chapter-wise MCQs will help students strengthen their understanding and score well in exams. The Units and Measurements Class 11 Physics MCQs are designed to clarify key concepts and allow students to test their knowledge and accuracy within a given time frame.

MCQs on Class 11 Physics Chapter 2 Units and Measurements – Question with Answers

Check out multiple-choice questions from Chapter 2, Units and Measurements. Each question includes four options, out of which only one is correct. Students must select the right answer and verify it with the solutions provided here.

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1. The branch of Physics that deals with measurement of physical quantities is called

a) Metrology
b) Morphology
c) Astrology
d) Chronology
Answer: a) Metrology

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2. The SI system of units is based on how many fundamental quantities?

a) 5
b) 6
c) 7
d) 8
Answer: c) 7

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3. Which of the following is NOT a fundamental quantity?

a) Length
b) Mass
c) Velocity
d) Time
Answer: c) Velocity

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4. The SI unit of luminous intensity is

a) Lux
b) Candela
c) Lumen
d) Watt
Answer: b) Candela

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5. Which of the following is a derived unit?

a) Kilogram
b) Meter
c) Second
d) Newton
Answer: d) Newton

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6. Which of the following has dimensions of force?

a) MLT⁻²
b) ML²T⁻²
c) MLT⁻¹
d) ML⁻¹T⁻²
Answer: a) MLT⁻²

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7. Dimensional formula of work is

a) [MLT⁻²]
b) [ML²T⁻²]
c) [MLT⁻¹]
d) [M⁰L⁰T⁰]
Answer: b) [ML²T⁻²]

8. The SI unit of pressure is

a) Pascal
b) Bar
c) Newton
d) Joule
Answer: a) Pascal

9. Which one of the following pairs has the same dimensions?

a) Work and Torque
b) Pressure and Energy
c) Momentum and Work
d) Power and Energy
Answer: a) Work and Torque

10. What is the dimensional formula of Planck’s constant (h)?

a) [ML²T⁻¹]
b) [ML²T⁻²]
c) [MLT⁻¹]
d) [ML²T⁻³]
Answer: a) [ML²T⁻¹]

11. Which of the following is not dimensionless?

a) Refractive index
b) Strain
c) Angle
d) Speed
Answer: d) Speed

12. SI unit of frequency is

a) Hertz
b) Newton
c) Joule
d) Watt
Answer: a) Hertz

13. SI unit of force is

a) Joule
b) Pascal
c) Newton
d) Watt
Answer: c) Newton

14. The SI unit of electric current is

a) Coulomb
b) Ampere
c) Volt
d) Ohm
Answer: b) Ampere

15. Which physical quantity has the unit "kg·m²/s²"?

a) Force
b) Work/Energy
c) Pressure
d) Power
Answer: b) Work/Energy

16. Which physical quantity has the unit "J/s"?

a) Force
b) Work
c) Power
d) Momentum
Answer: c) Power

17. Which of these is not an SI base unit?

a) Kilogram
b) Meter
c) Second
d) Calorie
Answer: d) Calorie

18. Which of the following has dimensions [M⁰L⁰T⁰]?

a) Work
b) Refractive index
c) Power
d) Velocity
Answer: b) Refractive index

19. Which of these is a dimensionless constant?

a) Gravitational constant
b) Planck’s constant
c) Fine-structure constant
d) Boltzmann constant
Answer: c) Fine-structure constant

20. What is the dimensional formula of velocity?

a) [LT⁻¹]
b) [LT⁻²]
c) [L²T⁻¹]
d) [L⁰T⁻¹]
Answer: a) [LT⁻¹]

21. Which of the following is NOT a derived physical quantity?

a) Work
b) Mass
c) Power
d) Pressure
Answer: b) Mass

22. Which of the following has the same dimensional formula?

a) Stress and Pressure
b) Velocity and Acceleration
c) Power and Force
d) Energy and Momentum
Answer: a) Stress and Pressure

23. Which of the following has different dimensions?

a) Impulse
b) Momentum
c) Force × Time
d) Work
Answer: d) Work

24. SI unit of energy is

a) Joule
b) Watt
c) Newton
d) Henry
Answer: a) Joule

25. SI unit of torque is

a) Nm
b) N/m
c) Joule
d) Pascal
Answer: a) Nm

26. Which physical quantity has the unit "N·s"?

a) Energy
b) Momentum
c) Power
d) Pressure
Answer: b) Momentum

27. Which of the following is dimensionally correct?

a) Force = Mass × Acceleration
b) Work = Force × Time
c) Pressure = Energy × Distance
d) Power = Work × Time
Answer: a) Force = Mass × Acceleration

28. Which of the following methods is used to check correctness of an equation?

a) Dimensional analysis
b) Unit conversion
c) Integration
d) Differentiation
Answer: a) Dimensional analysis

29. Which of these cannot be derived using dimensional analysis?

a) Value of constant
b) Checking correctness of formula
c) Conversion of units
d) Deriving relation between physical quantities
Answer: a) Value of constant

30. Which physical quantity has unit "kg·m/s"?

a) Energy
b) Force
c) Momentum
d) Pressure
Answer: c) Momentum

31. Which physical quantity has dimension [ML⁻¹T⁻²]?

a) Pressure
b) Energy
c) Force
d) Momentum
Answer: a) Pressure

32. Which has the same dimensions as impulse?

a) Momentum
b) Work
c) Power
d) Pressure
Answer: a) Momentum

33. Which of these has no units?

a) Angle (in radian)
b) Temperature
c) Time
d) Energy
Answer: a) Angle (in radian)

34. Which is the fundamental unit of temperature in SI?

a) Fahrenheit
b) Celsius
c) Kelvin
d) Joule
Answer: c) Kelvin

35. Which is not a unit of time?

a) Second
b) Minute
c) Hour
d) Joule
Answer: d) Joule

36. Which unit is used to measure astronomical distances?

a) Light year
b) Kilometer
c) Newton
d) Joule
Answer: a) Light year

37. Which quantity is measured in parsec?

a) Distance
b) Energy
c) Time
d) Force
Answer: a) Distance

38. Which unit is not used for measuring length?

a) Fermi
b) Angstrom
c) Joule
d) Light year
Answer: c) Joule

39. Which is the SI unit of solid angle?

a) Radian
b) Steradian
c) Degree
d) None of these
Answer: b) Steradian

40. Which is the SI unit of plane angle?

a) Radian
b) Steradian
c) Degree
d) Joule
Answer: a) Radian

41. Which is the dimension of universal gravitational constant G?

a) [M⁻¹L³T⁻²]
b) [ML²T⁻²]
c) [ML⁻¹T⁻²]
d) [M⁰L³T⁻²]
Answer: a) [M⁻¹L³T⁻²]

42. Which of these has no dimension?

a) Relative density
b) Force
c) Power
d) Work
Answer: a) Relative density

43. Which of these is not a unit of energy?

a) Erg
b) Calorie
c) Joule
d) Dyne
Answer: d) Dyne

44. What is the SI unit of Planck’s constant (h)?

a) Js
b) J/s
c) N/m
d) Wb
Answer: a) Js

45. Which unit is used to measure intensity of sound?

a) Decibel
b) Joule
c) Watt
d) Pascal
Answer: a) Decibel

46. Which unit is used for measuring luminous flux?

a) Lumen
b) Candela
c) Lux
d) Watt
Answer: a) Lumen

47. Which quantity has the dimension [ML²T⁻³]?

a) Power
b) Work
c) Pressure
d) Energy
Answer: a) Power

48. Which has the dimension [ML²T⁻²]?

a) Work/Energy
b) Pressure
c) Velocity
d) Impulse
Answer: a) Work/Energy

49. Which has the unit "Nm⁻²"?

a) Pressure
b) Work
c) Torque
d) Energy
Answer: a) Pressure

50. The dimensional formula of surface tension is

a) [MT⁻²]
b) [ML²T⁻²]
c) [ML⁰T⁻²]
d) [MT⁻¹]
Answer: a) [MT⁻²]

51. Which of the following is not a SI derived unit?

a) Joule
b) Newton
c) Coulomb
d) Erg
Answer: d) Erg

52. One angstrom is equal to

a) 10⁻¹⁰ m
b) 10⁻⁹ m
c) 10⁻⁸ m
d) 10⁻¹² m
Answer: a) 10⁻¹⁰ m

53. 1 fermi = ?

a) 10⁻¹⁵ m
b) 10⁻¹⁴ m
c) 10⁻¹⁰ m
d) 10⁻⁹ m
Answer: a) 10⁻¹⁵ m

54. The SI unit of magnetic flux is

a) Weber
b) Tesla
c) Ampere
d) Henry
Answer: a) Weber

55. Which method is used to express errors in measurement?

a) Absolute error
b) Relative error
c) Percentage error
d) All of these
Answer: d) All of these

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MCQs on Class 11 Physics Chapter 2 FAQs

What is the dimensional formula of force?

Force = Mass × Acceleration = [MLT⁻²].

Why are units necessary in Physics?

Units give physical quantities a standard reference, making measurements clear and comparable across the world.

What are significant figures?

They are digits in a number that carry meaningful information about its precision, including all certain digits and the first uncertain digit.

What are some common non-SI units used in Physics?

  • Minute, hour (time)
  • Degree, radian (angle)
  • Light year, parsec (distance)
  • Calorie (energy)

How many fundamental quantities are there in the SI system?

There are 7 fundamental quantities: length, mass, time, electric current, temperature, amount of substance, and luminous intensity.

What are derived quantities?

Quantities that are expressed in terms of fundamental quantities (e.g., velocity, force, energy, pressure) are called derived quantities.

What is the main focus of Chapter 2 Units and Measurements?

It introduces fundamental and derived physical quantities, SI units, dimensional analysis, and measurement of physical quantities with errors.

Can dimensional analysis find the value of constants?

No. Dimensional analysis cannot give numerical constants like ½, 2, π, etc.

What is the difference between precision and accuracy?

  • Accuracy: How close a measured value is to the true value.
  • Precision: How close repeated measurements are to each other, regardless of accuracy.