MCQ Questions for Class 8 Maths: Ch 12 Exponents and Powers
1. Multiplicative inverse of 7-2 is _________
(a) 49
(b) 5
(c) 7
(d) -14
► (a) 49
2. (am)n is equal to
(a) am+n
(b) am-n
(c) amn
(d) an-m
► (c) amn
3. Very small numbers can be expressed in standard form using __________ exponents.
(a) equal
(b) negative
(c) positive
(d) none of these
► (b) negative
4. The Base in the expression 1024 is __________.
(a) 1
(b) 10
(c) 0
(d) 24
► (b) 10
5. Fill in the blank am × an = a ........ where m and n are natural numbers:-
(a) mn
(b) m + n
(c) m - n
(d) m/n
► (b) m + n
6. The value of 1/3-2 is equal to
(a) 9
(b) 1
(c) -6
(d) 1/3
► (a) 9
7. When we have to add numbers in standard form, we convert them into numbers with the ________ exponents.
(a) same
(b) different
(c) not equal
(d) None of these
► (a) same
8. The value of 30 is ________.
(a) 0
(b) 3
(c) 1
(d) None of these
► (c) 1
9. Value of (30 + 20) × 50 is
(a) 1
(b) 25
(c) 2
(d) 0
► (c) 2
7. When we have to add numbers in standard form, we convert them into numbers with the ________ exponents.
(a) same
(b) different
(c) not equal
(d) None of these
► (a) same
8. The value of 30 is ________.
(a) 0
(b) 3
(c) 1
(d) None of these
► (c) 1
9. Value of (30 + 20) × 50 is
(a) 1
(b) 25
(c) 2
(d) 0
► (c) 2
10. In exponential form 149,600,000,000 m is given by :
(a) 1.496 × 1011 m
(b) 1.496 × 108 m
(c) 14.96 × 108 m
(d) 14.96 × 1011 m
► (a) 1.496 × 1011 m
11. Evaluate the exponential expression (−n)4× (−n)2, for n = 5.
(a) 25
(b) 15625
(c) 3125
(d) 625
► (b) 15625
► (b) 15625
12. Evaluate exponential expression − 25.
(a) 15
(b) -32
(c) 16
(d) none of these
► (b) -32
13. Charge of an electron is 0.000,000,000,000,000,000,16 coulomb and in exponential form it can be written as
(a) 16 × 10-18 coulomb
(b) 1.6 × 10-21 coulomb
(c) 1.6 × 10-19 coulomb
(d) 16 × 10-21 coulomb
► (c) 1.6 × 10-19 coulomb
► (b) -32
13. Charge of an electron is 0.000,000,000,000,000,000,16 coulomb and in exponential form it can be written as
(a) 16 × 10-18 coulomb
(b) 1.6 × 10-21 coulomb
(c) 1.6 × 10-19 coulomb
(d) 16 × 10-21 coulomb
► (c) 1.6 × 10-19 coulomb
14. Find the value of the expression a2 for a = 10.
(a) 100
(b) 1
(c) 10
(d) None of these
► (a) 100
► (a) 100
15. In 102 the base is
(a) 1
(b) 0
(c) 10
(d) 100
► (c) 10
► (c) 10
16. The multiplicative inverse of 2-3 is
(a) 2
(b) 3
(c) 3
(d) 23
► (d) 23
17. 16 is the multiplicative inverse of
(a) 2-4
(b) 28
(c) 82
(d) 24
► (a) 2-4
18. The standard form of 9030000000 is given by
(a) 9.03 × 109
(b) 90.3 × 107
(c) 903 × 106
(d) 9.03 × 10-9
► (a) 9.03 × 109
19. The value of 72 is
(a) 7
(b) 49
(c) 2
(d) 14
► (b) 49
20. The value of 10000 is
(a) 0
(b) 1000
(c) 1
(d) None of these
► (c) 1