[CLASS 8] Mathematics MCQs on Powers with Negative Exponents

Mathematics Multiple Choice Questions & Answers on “Powers with Negative Exponents”.

1. What is the multiplicative inverse of 10^-3?
a) 100
b) -100
c) (frac{1}{1000})
d) 1000
Answer: d
Clarification: Multiplicative inverse of aⁿ = (frac{1}{a^n})
⇒ Multiplicative inverse of 10^-3 = 10³ = 1000.

2. What is the value of 10^-6?
a) -0.000010
b) -0.0000010
c) 0.000010
d) 0.0000010
Answer: c
Clarification: a^-m = (frac{1}{a^m})
⇒ 10^-6 = 0.000010.

3. Find the value of 3^-2.
a) (frac{1}{9})
b) –(frac{1}{9})
c) 8
d) (frac{1}{8})
Answer: a
Clarification: a^-m = (frac{1}{a^m})
⇒ 3^-2 = (frac{1}{3^2} = frac{1}{9}).

4. Find the unknown value: (frac{1}{729}) = 9.
a) -4
b) -3
c) 3
d) 4
Answer: b
Clarification: a^-m = (frac{1}{a^m})
⇒ 9^-3 = (frac{1}{9^3} = frac{1}{729}).