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.
(1) Only (1) is correct
(2) Only (2) is correct
(3) Both are correct
(4) None of them is correct.
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(3) Since for 50.14 cm, significant number = 4 and for 0.00025, significant numbers = 2
So 50.14 cm is more accurate (more no. of significant figures)
Also , 478 km + 397 m = (478 + 0.397) km
= 478.397 km
Rounding off to zero decimal places, ans is 478 km