Which one is correct in the filling space ? 1 gram =.........kilogram.
(A) `1/1000`, (B) `10^(-3)`, ( C) 0.0001, (D) 1000

Options

A. A,B
B. A,C
C. B,C
D. C,D

Explanation

To solve the question "Which one is correct in the filling space? 1 gram =.........kilogram," we need to convert grams to kilograms using the known conversion factor.

### Step-by-Step Solution:

1. **Understand the Conversion Factor**:
We know that 1 kilogram (kg) is equal to 1000 grams (g). This means that to convert grams to kilograms, we need to divide the number of grams by 1000.

2. **Set Up the Equation**:
We can express the relationship mathematically:
\[ 1 \text{ gram} = \frac{1}{1000} \text{ kilograms} \]

3. **Convert to Decimal Form**:
The fraction \(\frac{1}{1000}\) can also be expressed in decimal form:
\[ \frac{1}{1000} = 0.001 \]

4. **Express in Scientific Notation**:
The decimal \(0.001\) can also be written in scientific notation as:
\[ 0.001 = 10^{-3} \]

5. **Identify the Correct Options**:
From the options given:
- (A) \( \frac{1}{1000} \)
- (B) \( 10^{-3} \)
- (C) \( 0.0001 \)
- (D) \( 1000 \)

We can see that both (A) and (B) are correct representations of the conversion from grams to kilograms.

6. **Conclusion**:
Therefore, the correct answers are (A) and (B).

### Final Answer:
The correct options are (A) \( \frac{1}{1000} \) and (B) \( 10^{-3} \).