JEE (Main) Physics - Units and Measurements MCQs

16. Which of the following is a fundamental unit in the SI system?

    • A. Newton
    • B. Joule
    • C. Meter
    • D. Pascal

    Answer: C. Meter

17. Which of these is a derived unit?

    • A. Second
    • B. Kelvin
    • C. Joule
    • D. Kilogram

    Answer: C. Joule

18. The SI unit of force, Newton, is equivalent to:

    • A. kg·m/s
    • B. kg·m²/s
    • C. kg·m/s²
    • D. g·cm/s²

    Answer: C. kg·m/s²

19. Which of the following is not a derived quantity?

    • A. Velocity
    • B. Energy
    • C. Acceleration
    • D. Time

    Answer: D. Time

20. The least count of a vernier caliper is:

    • A. The smallest measurement it can accurately read
    • B. The total length of the vernier scale
    • C. The smallest division on the main scale
    • D. Half the smallest division on the main scale

    Answer: A. The smallest measurement it can accurately read

21. If the least count of a screw gauge is 0.01 mm, how many divisions are there on the circular scale if the pitch is 1 mm?

    • A. 10
    • B. 50
    • C. 100
    • D. 200

    Answer: C. 100

22. Which instrument typically has the smallest least count?

    • A. Vernier caliper
    • B. Micrometer screw gauge
    • C. Measuring tape
    • D. Meter scale

    Answer: B. Micrometer screw gauge

23. The least count of a simple pendulum experiment using a stopwatch is usually:

    • A. 0.1 s
    • B. 0.5 s
    • C. 1 s
    • D. 5 s

    Answer: A. 0.1 s

24. How many significant figures are in the number 0.00302?

    • A. 2
    • B. 3
    • C. 4
    • D. 5

    Answer: B. 3

25. When multiplying 4.32 (3 significant figures) by 2.1 (2 significant figures), the answer should have:

    • A. 2 significant figures
    • B. 3 significant figures
    • C. 4 significant figures
    • D. 5 significant figures

    Answer: A. 2 significant figures

26. Which of the following has the greatest number of significant figures?

    • A. 0.0045
    • B. 4.500
    • C. 450
    • D. 4.5 × 10²

    Answer: B. 4.500

27. The number 6.022 × 10²³ (Avogadro's number) has:

    • A. 3 significant figures
    • B. 4 significant figures
    • C. 5 significant figures
    • D. Infinite significant figures

    Answer: C. 5 significant figures

28. If the measured value is 9.8 cm and the true value is 10.0 cm, the absolute error is:

    • A. 0.1 cm
    • B. 0.2 cm
    • C. 0.3 cm
    • D. 0.5 cm

    Answer: B. 0.2 cm

29. Which type of error is caused by faulty calibration of an instrument?

    • A. Random error
    • B. Systematic error
    • C. Gross error
    • D. Human error

    Answer: B. Systematic error

30. The percentage error in measuring a quantity is calculated as:

    • A. (True Value - Measured Value)/True Value × 100%
    • B. (Measured Value - True Value)/Measured Value × 100%
    • C. (True Value + Measured Value)/True Value × 100%
    • D. (True Value - Measured Value)/Measured Value × 100%

    Answer: A. (True Value - Measured Value)/True Value × 100%

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