MCQ Questions for Class 8 Maths: Ch 12 Exponents and Powers

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

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

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         

14. Find the value of the expression a2 for a = 10.
(a) 100
(b) 1
(c) 10
(d) None of these
► (a) 100

15. In 102 the base is
(a) 1
(b) 0
(c) 10
(d) 100
► (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
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