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Question 30136
JEE Physics · Hard

Errors and Measurements: Precision MCQ

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PrecisionHardQuestion 30136

Question

An instrument has a least count of 0.001 cm. A student records 2.340 cm. The number of significant figures in this reading is:
  1. A
    3
  2. B
    4
    Correct
  3. C
    5
  4. D
    2

Correct answer

4

Explanation

2, 3, 4, 0 — all four digits are significant. The trailing zero after the decimal is significant because it was measured.

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