Which of the following is true for significant digits? (A) An exact number has a finite ( limited) number of significant digits (B) Numbers 1 to 9 are not significant digits
(C) Counted numbers are significant digits
(D) Zeroes at the beginning of a measured value are not significant digits

Counted numbers are significant digits

The term significant figures are referring to the number of important digits (0 through 9 inclusive) in the coefficient of some expression in the scientific notation. The number of significant figures in any expression indicate the confidence or precision with which we can state a quantity.

Some rules for significant figures are:

1. All non-zero numbers are significant.

2. Zeros located between non-zero digits are significant.

3. Trailing zeros at the end will be significant only if the number contains a decimal point; otherwise, they are insignificant.

4. Zeros to the left of the first nonzero digit are insignificant.

5. Number in exponents (for example power of 10) is insignificant.

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