The number of significant zeros present in the measured value 0.020040 , is

Options

A. Five
B. Two
C. One
D. Three

Answer

To determine the number of significant zeros in the measured value 0.020040, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Decimal Point**: The given number is 0.020040. We can see that it has a decimal point.

2. **Analyze Leading Zeros**: Leading zeros (the zeros before the first non-zero digit) are not considered significant. In this case, the leading zeros are the two zeros before the '2' (0.0**20**040). Therefore, these leading zeros do not count towards the significant figures.

3. **Identify Non-Zero Digits**: The first non-zero digit in this number is '2'. After '2', we have '0', '4', and '0'.

4. **Count the Zeros After Non-Zero Digits**:
- The first zero after '2' (which is the first significant figure) is significant because it is between non-zero digits (2 and 4).
- The second zero after '4' is also significant because it comes after a non-zero digit (4).

5. **Count the Total Significant Figures**:
- The significant figures in 0.020040 are:
- 2 (first significant figure)
- 0 (second significant figure, between non-zero digits)
- 4 (third significant figure)
- 0 (fourth significant figure, after a non-zero digit)
- Therefore, we have a total of 4 significant figures.

6. **Identify the Significant Zeros**:
- The significant zeros in this number are the two zeros (the one after '2' and the one after '4').

7. **Final Count of Significant Zeros**: Thus, the total number of significant zeros in the measured value 0.020040 is **2**.

### Conclusion:
The number of significant zeros present in the measured value 0.020040 is **2**.

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