Physics
NULL
Medium
Question
Three students measured the length of a needle with meter rod and recorded as : (i) 0.2145m (ii) 0.21m (iii) 0.214m Which one is a correct record ?
A
Only (i)
B
Only (ii)
C
Only (iii)
✓ Official correct answer
D
Both (i) and (ii)
Community credibility
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A
Only (i)
No member explanations yet for this option.
B
Only (ii)
No member explanations yet for this option.
C
Only (iii)
No member explanations yet for this option.
D
Both (i) and (ii)
No member explanations yet for this option.
Explanation
A meter rod typically has a least count of 1 mm (0.001 m), so readings should be recorded to 3 decimal places. Only 0.214 m matches this precision; 0.2145 m implies unrealistic sub-millimeter precision, and 0.21 m under-reports the instrument's precision.
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