Which is the smallest of these lengths?
A0.000007 m
B0.000030 m
C0.000070 m
D0.000003 m
Answer & Solution
Correct answer: D. 0.000003 m
1. Compare the numbers written in standard form.
2. The wire on a chip is 3 x 10^-6 m and a red cell 7 x 10^-6 m.
3. 3 x 10^-6 m is the smallest of the four.
4. So the answer is 0.000003 m.
_Source: NCERT Class 8 Mathematics, Ch 10 'Exponents and Powers'_
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