Question

In the context of accuracy to measurement and significant figures in expressing results of experiment, which of the following is/are correct?
(1) Out of the 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 traveled is 478 km.

• A. Only (1) is correct
• B. Only (2) is correct
• C. Both are correct
• D. None of these is correct.

Answer 1

Answer: (C)

Both are correct

Significant figures are the number of digits in a value, often a measurement, that contribute to the degree of accuracy of the value. We start counting significant figures at the first non-zero digit.

Since for $50.14cm$

Now, the significant number$=4$

and for $0.00025$

Significant number $=2$

Both are correct