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
Evaluate the exponential expression \({\left( { - {\text{a}}} \right)^{\text{3}}} \times {\text{ }}{\left( { - {\text{a}}} \right)^{\text{2}}},{\text{for}}{\text{a}} = {\text{ 2}}\).
  • A
    -32
    Correct
  • B
    32
  • C
    16
  • D
    -16
2
Evaluate the exponential expression \({\left( { - {\text{m}}} \right)^{\text{5}}} \times {\text{ }}{\left( { - {\text{m}}} \right)^{ - {\text{5}}}}\), for m = 1.
  • A
    -1
  • B
    2
  • C
    3
  • D
    1
    Correct
3
Evaluate the exponential expression \({\left( { - {\text{n}}} \right)^{\text{5}}} \times {\text{ }}{\left( { - {\text{n}}} \right)^{\text{3}}}\), for n = 3.
  • A
    6561
    Correct
  • B
    -6561
  • C
    -729
  • D
    729
4
Evaluate the exponential expression \({\left( { - {\text{x}}} \right)^{\text{2}}} \times {\text{ }}{\left( { - {\text{x}}} \right)^{\text{3}}}\), for x = 5.
  • A
    -3125
    Correct
  • B
    125
  • C
    3125
  • D
    -625
5
Evaluate the exponential expression \({\left( { - {\text{y}}} \right)^{\text{4}}} \times {\text{ }}{\left( { - {\text{y}}} \right)^{\text{5}}}\), for y = 1.
  • A
    1
  • B
    None of these
  • C
    2
  • D
    -1
    Correct
6
Find the value of the expression \({{\text{x}}^{\text{3}}}\) for x = 10.
  • A
    10
  • B
    1000
    Correct
  • C
    100
  • D
    None of these
7
Find the value of the expression \({{\text{m}}^{\text{4}}}\) for m = 5.
  • A
    625
    Correct
  • B
    25
  • C
    125
  • D
    5
8
Find the value of the expression \({{\text{y}}^{\text{5}}}\) for y = 3.
  • A
    27
  • B
    81
  • C
    3
  • D
    243
    Correct
9
Find the value of the expression \({{\text{n}}^{\text{2}}}\) for n = 11.
  • A
    1
  • B
    121
    Correct
  • C
    11
  • D
    10
10
Find the value of the expression \({{\text{b}}^0}\) for b = 13.
  • A
    1
    Correct
  • B
    None of these
  • C
    13
  • D
    169
11
Find x so that \({\left( {--{\text{3}}} \right)^x}^{ + {\text{ 1}}} \times {\text{ }}{\left( {-{\text{3}}} \right)^{\text{5}}} = {\text{ }}{\left( {-{\text{3}}} \right)^{\text{7}}}\)
  • A
    4
  • B
    1
    Correct
  • C
    3
  • D
    2
12
Find y so that \({\left( {--{\text{2}}} \right)^y}^{ + {\text{ 1}}} \times {\text{ }}{\left( {-{\text{2}}} \right)^{\text{6}}} = {\text{ }}{\left( {-{\text{2}}} \right)^{\text{9}}}\)
  • A
    2
    Correct
  • B
    3
  • C
    1
  • D
    4
13
Find a so that \({\left( {--{\text{5}}} \right)^a}^{ + {\text{ 3}}} \times {\text{ }}{\left( {-{\text{5}}} \right)^{\text{2}}} = {\text{ }}{\left( {-{\text{5}}} \right)^{\text{6}}}\)
  • A
    2
  • B
    1
    Correct
  • C
    4
  • D
    3
14
Find b so that \({\left( {\text{4}} \right)^b}^{ - {\text{ 3}}} \times {\text{ }}{\left( {\text{4}} \right)^{\text{8}}} = {\text{ }}{\left( {\text{4}} \right)^{\text{7}}}\)
  • A
    3
  • B
    2
    Correct
  • C
    4
  • D
    1
15
Find n so that \({\left( {\text{6}} \right)^n}^{ + {\text{ 3}}} \times {\text{ }}{\left( {\text{6}} \right)^{\text{5}}} = {\text{ }}{\left( {\text{6}} \right)^{{\text{11}}}}\)
  • A
    4
  • B
    2
  • C
    3
    Correct
  • D
    1