Question

Assertion (A): There are 2 significant figures in 0.0026. Reason (R): All digits which appear at least one time in a big number are taken as significant figures.​

Answer 1

Answer:

assertion is right but reason is wrong.

Explanation:

Let's see what the reason states

Reason (R): All digits which appear at least one time in a big number are taken as significant figures.

Let us take a number and check whether this is right, say 1500000

If that is the case, then in 1500000 , since the digit 0 repeats for 5 times and the digits 1,5 appear for one time, the number of significant figures must be 7.

But in actual, the number of significant figures is 2. Hence the reason is wrong.

Answer 2

The Assertion is correct, but the reasoning is incorrect.

: Let's have a look at what the cause is.

Reason (R): Significant figures are all digits that appear at least once in a large number.

Let's pick a number and see whether it's correct, say 19000000.

If this is the case, the number of significant figures in 19000000 must be 9, because the digit 0 appears 7 times and the digits 1,9 occur just once.

However, the real number of important figures is two. As a result, the reason is incorrect.