Q.

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

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a

Only (a) is correct

b

Only (b) is correct

c

Both are correct

d

None of them is correct

answer is B.

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Detailed Solution

Since for 50.14 cm, Least count = 0.01 and for 0.00025, Least Count =0.00001The one with smaller least count gives more accuracy. Hence (a) is wrong.Total distance = 478 km + 0.397 km = 478.397 km = 478 km (as per rules of significant figures)
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In the context of accuracy of measurement and significant figures in expressing results of experiment, which of the following is/are correct(a) Out of the two measurements 50.14 cm and 0.00025 ampere, the first one has greater accuracy.(b) If one travels 478 km by rail and 397 m by road, the total distance travelled is 478 km.