Question

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.

• 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 1

Answer: (A)

If the number is less than one, the zero on the right of decimal point but to the left of the first non-zero digit are not significant, i.e. in $\underline{0} . \underline{00} 764$, 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).