Question:
If \( 2.7\times10^{-6} \) is added to \( 4.3\times10^{-5} \), giving due regard to significant figures, the result will be
If \( 2.7\times10^{-6} \) is added to \( 4.3\times10^{-5} \), giving due regard to significant figures, the result will be
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In addition, round off based on decimal precision, not significant digits.
Updated On: Apr 21, 2026
- \( 4.57\times10^{-5} \)
- \( 4.6\times10^{-5} \)
- \( 4.5\times10^{-5} \)
- \( 7.0\times10^{-5} \)
- \( 4.57\times10^{-6} \)
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The Correct Option is B
Solution and Explanation
Concept:
In addition, round off according to least precise decimal place.
Step 1: Convert to same power.
\[ 4.3\times10^{-5} = 43\times10^{-6} \] \[ 43\times10^{-6} + 2.7\times10^{-6} = 45.7\times10^{-6} \]
Step 2: Apply significant figures.
\[ = 4.57\times10^{-5} \approx 4.6\times10^{-5} \]
Step 1: Convert to same power.
\[ 4.3\times10^{-5} = 43\times10^{-6} \] \[ 43\times10^{-6} + 2.7\times10^{-6} = 45.7\times10^{-6} \]
Step 2: Apply significant figures.
\[ = 4.57\times10^{-5} \approx 4.6\times10^{-5} \]
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