Significant figures in 0.004050: MCQ with Answer and Explanation

Significant figures in 0.004050:
A. 4
B. 7
C. 5
D. 3
Answer: Option A
Solution (By JKSSB Mock Tests)
Rules: leading zeros not significant; trailing zero after decimal is significant. Digits 4,0,5,0 are significant ⇒ 4 sig figs. Memory tip: 'Start at first non-zero; include trailing zeros after decimal'. Measurement precision concept frequently tested in competitive exams.

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