Physics Class 11 Units and Measurement MCQ for NEET with Answers

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

  1. Steradian
  2. Degrees
  3. Radians
  4. Grades

Answer: 1

2. 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 S.I. system than in CGS system
  4. Directly proportional to the fundamental units of mass, length, and time

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

21. A thin copper wire of length l 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

22. 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

23. Accuracy of measurement is determined by:

  1. Absolute Error
  2. Percentage Error
  3. Both
  4. None of these

Answer: 2

24. 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

25. In vernier calipers, 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 calipers is:

  1. (n – 1/n) x
  2. nx/(n – 1)
  3. x/n
  4. x/(n – 1)

Answer: 3

26. A vernier caliper 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 caliper, the least count is:

  1. 0.02 mm
  2. 0.05 mm
  3. 0.1 mm
  4. 0.2 mm

Answer: 4

27. If n main scale divisions coincide with (n + 1) vernier scale divisions. The least count of vernier calipers, 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

28. 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

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

  1. 0.9mm
  2. 1 mm
  3. 0.1 mm
  4. 0.8 mm

Answer: 3

30. One centimetre on the main scale of vernier caliper 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 caliper is

  1. 0.01 cm
  2. 0.02 cm
  3. 0.05 cm
  4. 0.005 cm

Answer: 2

31. The vernier constant of a vernier caliper 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

32. In a vernier caliper, 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 millimeter, then the vernier constant is:

  1. 0.5 mm
  2. 0.1 mm
  3. 0.05 mm
  4. 0.005 mm

Answer: 3

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