NEET Physics Significant Figures MCQ Question
Tick the incorrect statements?
(1) For the formula radius = diameter/2, the factor 2 has infinite significant figures.
(2) Keeping the significant figures in view, the sum of the physical quantities and 0.123 m is 205.3 m.
(3) Keeping the significant figures in view, the radius of a circle is stated as 2.12 cm. Its area should be written as 14.11 cm².
(4) 2.745 rounded off to three significant figures becomes 2.74.
Correct Answer
Detailed Explanation
(1) 🟢 ✓ Correct The number 2 is an exact number, so it has infinite significant figures.
(2) 🟢 ✓ Correct For addition, the result is rounded to the least decimal places. Hence, the answer is 205.3 m.
(3) 🔴 ✗ Incorrect The radius has 3 significant figures, so the area should be 14.1 cm², not 14.11 cm².
(4) 🟢 ✓ Correct On rounding 2.745 to 3 significant figures, the answer is 2.74. ⚡ Quick Revision Addition/Subtraction → Least decimal places Multiplication/Division → Least significant figures Exact numbers → Infinite significant figures Rounding off 5 → Use the round-to-even rule
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