Class 8 Exponents And Powers CBSE Questions & Answers

Class 8 · Exponents And Powers

This is Mathematics Class 8 Exponents and Powers CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Simplify and write in exponential form: \({x^{\text{2}}} \times {x^{-{\text{5}}}}\)
  • A
    \({x^{ - {\text{5}}}}\)
  • B
    \({x^{\text{3}}}\)
  • C
    \({x^{ - {\text{3}}}}\)
    Correct
  • D
    None of these
2
Simplify and write in exponential form: \({m^{ - {\text{3}}}} \times {m^{-{\text{12}}}}\)
  • A
    \({m^{{\text{15}}}}\)
  • B
    None of these
  • C
    \({m^{ - {\text{9}}}}\)
  • D
    \({m^{ - {\text{15}}}}\)
    Correct
3
Simplify and write in exponential form: \({n^{\text{4}}} \times {n^{\text{5}}}\)
  • A
    \({n^{ - {\text{5}}}}\)
  • B
    \({n^{\text{9}}}\)
    Correct
  • C
    None of these
  • D
    \({n^{ - {\text{9}}}}\)
4
Simplify and write in exponential form: \({a^{ - {\text{7}}}} \times {a^{{\text{1}}0}}\)
  • A
    \({a^{\text{3}}}\)
    Correct
  • B
    \({a^{ - {\text{5}}}}\)
  • C
    None of these
  • D
    \({a^{ - {\text{3}}}}\)
5
Simplify and write in exponential form: \({b^{\text{3}}} \times {b^{\text{6}}}\)
  • A
    \({b^{ - {\text{5}}}}\)
  • B
    \({b^{ - {\text{9}}}}\)
  • C
    None of these
  • D
    \({b^{\text{9}}}\)
    Correct
6
\({x^0}\)= _______
  • A
    1
    Correct
  • B
    3
  • C
    x
  • D
    2
7
\({m^0}\)= _______
  • A
    \({{\text{m}}^{\text{2}}}\)
  • B
    m
  • C
    \({{\text{m}}^{\text{3}}}\)
  • D
    1
    Correct
8
\({y^0}\)= _______
  • A
    y
  • B
    \({{\text{y}}^{\text{3}}}\)
  • C
    1
    Correct
  • D
    \({{\text{y}}^{\text{4}}}\)
9
Find the value of the expression \({\text{5 }} \times {\text{ }}{\left( { - {\text{m}}} \right)^{\text{2}}}\), for m = 2.
  • A
    10
  • B
    1
  • C
    5
  • D
    20
    Correct
10
Find the value of the expression \({\text{4 }} \times {\text{ }}{\left( { - {\text{x}}} \right)^{\text{2}}}\), for x = 5.
  • A
    25
  • B
    4
  • C
    50
  • D
    100
    Correct
11
Write the expression using exponents: \({\text{12 }} \times {\text{ 33 }} \times {\text{ 33 }} \times {\text{ 33}}\)
  • A
    \({\text{1}}{{\text{2}}^{\text{1}}} \times {\text{ 3}}{{\text{3}}^{\text{1}}}\)
  • B
    \({\text{1}}{{\text{2}}^{\text{3}}} \times {\text{ 3}}{{\text{3}}^{\text{1}}}\)
  • C
    \({\text{1}}{{\text{2}}^{\text{3}}} \times {\text{ 3}}{{\text{3}}^{\text{3}}}\)
  • D
    \({\text{1}}{{\text{2}}^{\text{1}}} \times {\text{ 3}}{{\text{3}}^{\text{3}}}\)
    Correct
12
Write the expression using exponents: \({\text{27 }} \times {\text{ 27 }} \times {\text{ 27 }} \times {\text{ 57 }} \times {\text{ 57}} \times {\text{ 57}}\)
  • A
    \({\text{2}}{{\text{7}}^{\text{3}}} \times {\text{ 5}}{{\text{7}}^{\text{1}}}\)
  • B
    \({\text{2}}{{\text{7}}^{\text{3}}} \times {\text{ 5}}{{\text{7}}^{\text{3}}}\)
    Correct
  • C
    \({\text{2}}{{\text{7}}^{\text{1}}} \times {\text{ 5}}{{\text{7}}^{\text{1}}}\)
  • D
    \({\text{2}}{{\text{7}}^{\text{3}}} \times {\text{ 5}}{{\text{7}}^{\text{1}}}\)
13
Find the value of the expression \({\left( {{\text{3m}}} \right)^{\text{3}}}\), for m = 4.
  • A
    4
  • B
    12
  • C
    1728
    Correct
  • D
    144
14
Find the value of the expression \({\left( {{\text{5x}}} \right)^{\text{2}}}\), for x = 2.
  • A
    4
  • B
    100
    Correct
  • C
    25
  • D
    20
15
Find the value of the expression \({\left( {{\text{7y}}} \right)^{\text{3}}}\), for y = 1.
  • A
    343
    Correct
  • B
    49
  • C
    7
  • D
    14