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Subjects
Mathematics State Board
Class 8
Numbers
Exponents and Powers

2. Multiple choice questions II

Exercise condition:

3 m.

1. Which is not correct?

${(\frac{- 1}{4})}^{2} = 16^{- 1}$
${- (\frac{1}{4})}^{2} = 16^{- 1}$
${(\frac{- 1}{4})}^{2} = 4^{- 2}$
${(\frac{- 1}{4})}^{2} = {(\frac{1}{2})}^{4}$

2. If

\frac{10^{x}}{10^{- 3}} = 10^{9}

, then \(x\) is _________.

\(6\)
\(7\)
\(4\)
\(5\)

3. \(0.0000000002020\) in scientific form is _____________.

\(2.02 \times 10^{-9}\)
\(2.02 \times 10^{9}\)
\(2.02 \times 10^{-10}\)
\(2.02 \times 10^{-8}\)

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