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JEE PHYSICS MCQ: UNITS & MEASUREMENTS

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Analyzing +4 | -1

In the context of accuracy of measurement and significant figures in expressing results of experiment, which of the following is/are correct
(1) Out of the two measurements 50.14 cm and 0.00025 ampere, the first one has greater accuracy
(2) If one travels 478 km by rail and 397 m by road, the total distance travelled is 478 km

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Correct option: C

Both are correct

Option C is correct. 50.14 cm has greater accuracy due to more significant figures. Converting 397 m to km gives 0.397 km, so the total distance is 478 + 0.397 = 478.397 km which rounds to 478 km due to significant figures.

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