The least count of a metre scale is
Correct answer: C. 1 mm.
- A. 0.001 cm.
- B. 0.1 mm.
- C. 1 mm.
- D. 1 cm
Explanation
The least count of a measuring instrument is the smallest measurement that can be accurately read. For a standard meter scale, the smallest division is 1 millimeter (mm), making the least count 1 mm. Option A, 0.001 cm, suggests an unrealistic precision not possible with a regular meter scale. Option B, 0.1 mm, is also not achievable with a typical meter scale. Option D, 1 cm, is too large to be the least count, as meter scales have finer divisions.
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Physical quantities combine a numerical value with a unit, and are expressed using SI base units or derived units such as newtons, joules and pascals. The topic covers prefixes, unit conversion, dimensional analysis, significant figures and measurement uncertainty, while distinguishing scalar quantities from vectors where direction matters.
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