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NEET CHEMISTRYEasy

How many significant figures are present in the following numbers? (I) 161 cm161\text{ cm} (II) 0.01610.0161 (III) 1.611.61

A

3, 3, 2003

B

3, 4, 2003

C

3, 2, 2003

D

3, 4, 2004

Step-by-Step Solution

  1. Analyze (I) 161 cm: According to the rule, all non-zero digits are significant. The digits 1, 6, and 1 are all non-zero.
  • Significant figures = 3 [Class 11 Physics, Ch 1, Sec 1.3, Rule 1].
  1. Analyze (II) 0.0161: For a number less than 1, the zero(s) on the right of the decimal point but to the left of the first non-zero digit are not significant. Therefore, the leading zeros are placeholders. The significant digits are 1, 6, and 1.
  • Significant figures = 3 [Class 11 Physics, Ch 1, Sec 1.3, Rule 3].
  1. Analyze (III) 1.61: All non-zero digits are significant. The digits 1, 6, and 1 are significant.
  • Significant figures = 3 [Class 11 Physics, Ch 1, Sec 1.3, Rule 1].

Conclusion: The number of significant figures are 3, 3, and 3 respectively.

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