49. How many significant figures are in the number 10,500,000? - Sindh Board (stb)

                               

EXPLANATION

Question: How many significant figures are in the number 10,500,000?

• a) 2
• b) 3
• c) 4
• d) 5

ANSWER: b) 3

EXPLANATION:

The number 10,500,000 has 3 significant figures.

The rules for determining the number of significant figures in a number are:

All non-zero digits are significant.

Any zeros between non-zero digits are significant.

Leading zeros (zeros to the left of the first non-zero digit) are not significant.

Trailing zeros (zeros to the right of the last non-zero digit) are significant only if they are followed by a decimal point.

In the number 10,500,000, the leading zeros are not significant because they are to the left of the first non-zero digit. The trailing zeros are not significant because they are not followed by a decimal point. Therefore, the only significant digits are 1, 0, 5, and 0. So the answer is (a).