Assertion (A) The number 0.00764 has three significant figures.
Reason (R ) If the number is less than 1, the zeros on the right of the decimal point but to the left of the first non-zero digit are not significant.

Options

A. Both (A) and (R ) are true and (R ) is the correct explanation of (A)
B. Both (A) and (R ) are true but (R ) is not the correct explanation of (A)
C. (A) is true but (R ) is false.
D. (A) is false but (R ) is true.

Answer

A

Explanation

If the number is less than one, the zero on the right of decimal point but to the left to the first non-zero digit are not significant, i.e., in 0.00764, the underlined zeroes are not significant. The number of significant digit is 3.
Both assertion (A) and reason (R ) are correct and reason (R ) is the correct explanation of assertion (A).