The given figure shows two different scales on a screw gauge
Correct answer: B. 38
- A. 35
- B. 38
- C. 40
- D. 45
Explanation
To find the measurement using a screw gauge, you need to add the reading from the main scale to the reading from the circular scale. If the main scale shows 30 and the circular scale shows 8, the total measurement is 38. Option B is correct because it accurately combines these readings. Options A, C, and D are incorrect due to errors in reading or combining the scales.
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About Physical Quantities and Units
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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