Units and Measurement MCQ for NEET with Answers

Units and Measurement is one of the first chapters in NEET Physics and forms the foundation for many topics throughout the syllabus. Although the chapter appears straightforward, questions on dimensional analysis, significant figures, errors in measurement, SI units, and measuring instruments often test conceptual understanding rather than memorisation.

Practising Units and Measurement MCQs for NEET helps students strengthen these concepts, improve numerical accuracy, and become familiar with the types of questions asked in the examination. The questions below include concept-based MCQs, and numerical problems for effective chapter-wise practice.

Units and Measurement MCQs with Answers for NEET

The following MCQs cover important concepts from the Units and Measurement chapter, including SI units, dimensions, dimensional analysis, significant figures, errors in measurement, vernier callipers, and screw gauge. Practising these questions regularly will help improve conceptual clarity and exam readiness. 

1. The magnitude of any physical quantity:

1. Depends on the method of measurement

2. Does not depend on the method of measurement

3. Is more in the S.I. system than in CGS system

4. Directly proportional to the fundamental units of mass, length, and time

Answer: 1

2. What is the unit of measurement of solid angle?

1. Steradian

2. Degrees

3. Radians

4. Grades

Answer: 1

3. Newton-second is the unit of

1. Velocity

2. Angular Momentum

3. Momentum

4. Energy

Answer: 3

4. Which of the following is not the unit of energy?

1. Calorie

2. Joule

3. Electron volt

4. Watt

Answer: 4

5. Candela is the unit of:

1. Electric intensity

2. Luminous intensity

3. Sound intensity

4. None of these

Answer: 2

6. Universal time is based on:

1. Rotation of the earth on its axis

2. Earth’s orbital motion around the earth

3. Vibrations of cesium atom

4. Oscillations of quartz crystal

Answer: 3

7. Which of the following quantities has the same dimensions as that of energy?

1. Power

2. Force

3. Momentum

4. Torque

Answer: 4

8. Which of the following pairs does not have similar dimensions?

1. Stress and Pressure

2. Tension and Surface Tension

3. Planck’s Constant and Angular Momentum

4. Angle and Strain

Answer: 2

9. Which pair has the same dimensions?

1. Work and Power

2. Density and Relative Density

3. Momentum and Impulse

4. Stress and Strain

Answer: 3

10. A unitless quantity:

1. May have a non-zero dimension

2. Always has a non-zero dimension

3. Never has a non-zero dimension

4. Does not exist

Answer: 3

11. The ratio of the dimensions of Planck’s constant and that of moment of inertia has the dimensions of:

1. Frequency

2. Velocity

3. Time

4. Angular momentum

Answer: 1

12. The dimension of Planck’s constant equals to that of:

1. Energy

2. Momentum

3. Angular momentum

4. Power

Answer: 3

13. The physical quantities not having same dimensions are:

1. Pressure and Bulk modulus

2. Torque and work

3. Momentum and Planck’s constant

4. Stress and Young’s modulus

Answer: 3

14. In the C.G.S. system the magnitude of the force is 100 dyne. In another system where the fundamental physical quantities are kilogram, metre, and minute, the magnitude of the force is:

1. 0.036

2. 0.36

3. 3.6

4. 36

Answer: 3

15. If a unit of length is 4m, the unit of mass is 4 kg and the unit of time is 2s, then 32 units of energy in this new system of unit.

Answer: 1/16

16. Assertion (1): The method of dimensional analysis cannot validate the exact relationship between physical quantities in any equations.

Reason (R): It does not distinguish between the physical quantities having same dimensions.

1. Assertion (1) is true, Reason (R) is true; Reason ® is a correct explanation for Assertion (1).

2. Assertion (1) is true, Reason (R) is true; Reason ® is not a correct explanation for Assertion (1).

3. Assertion (1) is true, Reason (R) is false.

4. Assertion (1) is false, Reason (R) is true.

Answer: 1

17. If L = 2.331 cm, B = 2.1 cm, then L + B =?

1. 4.431 cm

2. 4.43 cm

3. 4.4 cm

4. 4 cm

Answer: 3

18. Taking into account of the significant figures, what is the value of 9.99 m − 0.0099 m? (2020)

1. 9.98 m

2. 9.980 m

3. 9.9 m

4. 9.9801 m

Answer: 3

19. If 97.52 is divided by 2.54, the correct result in terms of significant figures is:

1. 38.4

2. 358.3937

3. 38.394

4. 38.39

Answer: 1

20. A silver wire has mass (0.6 ± 0.006)g, radius (0.5 ± 0.005) mm and length (4 ± 0.04)cm. The maximum percentage error in the measurement of its density will be:

1. 4%

2. 3%

3. 6%

4. 7%

Answer: 1

21. The mean time period of the second pendulum is 2.00s and the mean absolute error in the time period is 0.05s. To express the maximum estimate of error, the time period should be written as:

1. (2.00 ± 0.01)s

2. (2.00 + 0.025)s

3. (2.00 ± 0.05)s

4. (2.00 ± 0.10)s

Answer: 3

22. A thin copper wire of length 1 metre increases in length by 2% when heated through 10°C. What is the percentage increase in the area when a square copper sheet of length l metre is heated through 10°C?

1. 4%

2. 8%

3. 16%

4. None of the above

Answer: 1

23. The period of oscillation of a simple pendulum in the experiment is recorded as 2.63 s, 2.56 s, 2.42 s, 2.71 s and 2.80 s respectively. The average absolute error is:

1. 0.1 s

2. 0.11 s

3. 0.01 s

4. 1.0 s

Answer: 2

24. Accuracy of measurement is determined by:

1. Absolute Error

2. Percentage Error

3. Both

4. None of these

Answer: 2

25. The length of a cylinder is measured with a meter rod having the least count of 0.1 cm. Its diameter is measured with vernier calipers having the least count of 0.01 cm. Given that the length is 5.0 cm. and the radius is 2.0 cm. The percentage error in the calculated value of the volume will be:

1. 1%

2. 2%

3. 3%

4. 4%

Answer: 3

26. In vernier callipers, one main scale division is x cm and the n division of the vernier scale coincides with (n – 1) divisions of the main scale. The least count (in cm) of the callipers is:

1. (n – 1/n) x

2. nx/(n – 1)

3. x/n

4. x/(n – 1)

Answer: 3

27. A vernier calliper has 1 mm marks on the main scale. It has 20 equal divisions on the vernier scale, which match with 16 main scale divisions. For this vernier calliper, the least count is:

1. 0.02 mm

2. 0.05 mm

3. 0.1 mm

4. 0.2 mm

Answer: 4

28. If n main scale divisions coincide with (n + 1) vernier scale divisions. The least count of vernier callipers, when each centimetre on the main scale is divided into five equal parts, will be:

1. 2n/(n+1) mm

2. 2/(n+1) mm

3. 1/2n mm

4. 1/5n mm

Answer: 2

29. The least count of the main scale of a screw gauge is 1mm. The minimum number of divisions on its circular scale required to measure 5mm diameter of wire is:

1. 200

2. 50

3. 500

4. 100

Answer: 1

30. Value of one main scale division is 1mm and 0.9 mm is value of one division of the vernier scale, then the vernier constant is:

1. 0.9mm

2. 1 mm

3. 0.1 mm

4. 0.8 mm

Answer: 3

31. One centimetre on the main scale of vernier calliper is divided into ten equal parts. If 10 divisions of vernier scale coincide with 8 small divisions of the main scale, the least count of the calliper is

1. 0.01 cm

2. 0.02 cm

3. 0.05 cm

4. 0.005 cm

Answer: 2

32. The vernier constant of a vernier calliper is 0.001 cm. If 49 main scale divisions coincide with 50 vernier scale divisions, then the value of 1 main scale division is:

1. 0.1 mm

2. 0.5 mm

3. 0.4 mm

4. 1 mm

Answer: 2

33. In a vernier calliper, the ten smallest divisions of the vernier scale are equal to the nine smallest divisions on the main scale. If the smallest division on the main scale is a half millimetre, then the vernier constant is:

1. 0.5 mm

2. 0.1 mm

3. 0.05 mm

4. 0.005 mm

Answer: 3.

Benefits of Solving Units and Measurement MCQs for NEET

Regular practice of Units and Measurement MCQs can help students build a strong foundation in Physics and improve their performance in the NEET examination. Solving a variety of questions also enhances conceptual clarity and develops the accuracy required to tackle numerical problems effectively.

• Strengthens Fundamental Concepts: Helps develop a clear understanding of units, dimensions, significant figures, and measurement errors.

• Improves Problem-Solving Skills: Exposes students to different types of conceptual and numerical questions.

• Enhances Accuracy: Reduces the chances of calculation mistakes and improves precision.

• Familiarizes Students with NEET Patterns: Provides insight into the nature and difficulty level of questions asked in the examination.

• Boosts Confidence: Regular practice increases confidence and reduces exam-related stress.

• Improves Speed: Helps students solve questions more efficiently during the actual exam.

• Supports Other Physics Chapters: The concepts of Units and Measurement are used extensively in Mechanics, Thermodynamics, Modern Physics, and other topics.

• Aids in Quick Revision: Chapter-wise MCQs provide an effective way to revise important concepts before the examination.