Q. If $3.8\ \times 10^{- 6}$ is added to $4.2\ \times 10^{- 5}$ giving due regard to significant figures, then the result will be
A) $458 \times 10^{- 5}$
B) $4.6 \times 10^{- 5}$
C) $4.5 \times 10^{- 5}$
D) None of the above
Explanation
The correct answer is Option B: $4.6 \times 10^{- 5}$.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.