CBSE Questions for Class 8 Maths Exponents And Powers Quiz 2 - MCQExams.com

The value of $${ \left[ { \left( { 3 }^{ 2 } \right)  }^{ 2 } \right]  }^{ -1 }$$ is-
  • $$81$$
  • $$-81$$
  • $$-0.0123$$
  • $$0.0123$$
The thickness of paper is $$0.004\ m$$  and that of another paper is $$0.008\ m$$. Compare their sizes.
  • Paper-1 is double thicker than paper-2.
  • Thickness of paper-1 is half the thickness of paper-2.
  • Thickness of paper-1 is one-fourth of the thickness of  paper-2.
  • Paper-1 and paper-2 are both equally thick.
$$For \ a \  natural \  number \  n , \  2n(n-1)!\leqslant  n^n, if$$:
  • $$n<2$$
  • $$n>2$$
  • $$n\ge2$$
  • Never
The value of $$(-2)^{-5}$$
  • $$-32$$
  • $$\dfrac{-1}{32}$$
  • $$32$$
  • $$\dfrac{1}{32}$$
The value of $$(-3)^{-4}$$ is 
  • $$12$$
  • $$81$$
  • $$\dfrac{-1}{12}$$
  • $$\dfrac{1}{81}$$
The value of $$\left(\dfrac{2}{5}\right)^{-3}$$ is 
  • $$\dfrac{-8}{125}$$
  • $$\dfrac{25}{4}$$
  • $$\dfrac{125}{8}$$
  • $$\dfrac{-2}{5}$$
Mark tick against the correct answer in each of the following:
$$(1/2)^{-2} +(1/3)^{-2} + (1/4)^{-2}=$$?
  • $$(61/144)$$
  • $$29$$
  • $$(144/61)$$
  • none of these
$$\left( \dfrac { 1 }{ 2 }  \right) ^{ -2 }+\quad \left( \dfrac { 1 }{ 3 }  \right) ^{ -2 }+\left( \dfrac { 1 }{ 4 }  \right) ^{ -2 }$$
  • $$\dfrac{61}{144}$$
  • $$\dfrac{144}{61}$$
  • $$29$$
  • $$\dfrac{1}{29}$$
The value of $$\left(\dfrac 25 \right)^{-1}$$ is
  • $$\dfrac {2}{5}$$
  • $$\dfrac {5}{2}$$
  • $$-\dfrac {5}{2}$$
  • $$-\dfrac {2}{5}$$
$${ \left( \dfrac { -5 }{ 3 }  \right)  }^{ -1 }=?$$
  • $$\dfrac{5}{3}$$
  • $$\dfrac{3}{5}$$
  • $$\dfrac{-3}{5}$$
  • none of these
$$(-3/7)^{-1} = ?$$
  • $$7/3$$
  • $$-7/3$$
  • $$3/7$$
  • None of these
$${ \left( \dfrac { -1 }{ 2 }  \right)  }^{ -3 }=?$$
  • $$\dfrac{-1}{6}$$
  • $$\dfrac{1}{6}$$
  • $$\dfrac{1}{8}$$
  • $$-\dfrac{1}{8}$$
$$\left\{ \left( \dfrac { 1 }{ 3 }  \right) ^{ -3 }-\quad \left( \dfrac { 1 }{ 2 }  \right) ^{ -3 } \right\} \div \quad \left( \dfrac { 1 }{ 4 }  \right) ^{ -3 }=?$$
  • $$\dfrac{19}{64}$$
  • $$\dfrac{27}{16}$$
  • $$\dfrac{64}{19}$$
  • $$\dfrac{16}{25}$$
Mark tick against the correct answer in each of the following:
$$(6^{-1}-8^{-1})^{-1}=$$?
  • $$-\dfrac{1}{24}$$
  • $$-24$$
  • $$\dfrac{1}{24}$$
  • $$24$$
Mark tick against the correct answer in each of the following:
$$(-1/2)^{-6}=$$?
  • $$-64$$
  • $$64$$
  • $$(1/64)$$
  • $$(-1/64)$$
Mark tick against the correct answer in each of the following:
$$\left\{(3/4)^{-1}+(1/4)^{-1}\right\}^{-1}=$$?
  • $$(3/8)$$
  • $$(3/16)$$
  • $$(8/3)$$
  • $$(-8/3)$$
State whether the statements are true (T) or false (F).
The reciprocal of $$x^{-1}$$ is $$\dfrac{1}{x}.$$
  • True
  • False
For a fixed base(10) if the exponent decreases by $$1$$, the number becomes
  • One-tenth of the previous number.
  • Ten times of the previous number
  • Hundred of the previous number
  • Hundred times of the previous number
Mark tick against the correct answer in each of the following:
$$\left\{6^{-1} +(3/2)^{-1}\right\}^{-1}$$
  • $$(2/3)$$
  • $$(5/6)$$
  • $$(6/5)$$
  • None of these
Mark tick against the correct answer in each of the following:
$$[\left\{(-1/2) ^{2}\right\}^{-2}]^{-1}=$$?
  • $$(1/16)$$
  • $$16$$
  • $$(-1/16)$$
  • $$-16$$
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