Class 8 Maths Chapter 12 (Exponents and Powers) MCQs are available online for students. These objective questions are designed by experts, according to CBSE syllabus (2020-2021) and NCERT guidelines. The chapter-wise multiple-choice questions are available, to make students learn each concept and lead them to score good marks in exams. Also, learn important questions for class 8 Maths here.
MCQs on Class 8 Exponents and Powers
Multiple choice questions (MCQs) are given for Class 8 Exponents and Powers chapter. Solve each question and choose the right answer.
1. The value of 2-2 is:
A. 4
B. ¼
C. 2
D. ½
Answer: B
Explanation: 2-2 = 1/22 = ¼
2. The multiplicative inverse of 7-2 is:
A. 72
B. 7
C. 1/72
D. 1/7
Answer: A
Explanation: The multiplicative inverse of any value is the one which when multiplied by the original value gives a value equal to 1.
7-2 = 1/72
Hence, 72 x 1/72 = 1
3. 22 x 23 x 24 is equal to:
A. 224
B. 2-5
C. 29
D. 2-9
Answer: C
Explanation: By laws of exponents:
am x an = am+n
22 x 23 x 24 = 22+3+4 = 29
4. 3-2 x 3-5 is equal to:
A. 3-7
B. 3-3
C. 3-10
D. 37
Answer: A
Explanation: 3-2 x 3-5 = (1/32) x (1/35)
= (1/32+5)
= (1/37)
= 3-7
5. 54/52 is equal to:
A. 56
B. 5-6
C. 5-2
D. 52
Answer: D
Explanation: By exponent law:
am/an = am-n
54/52 = 54-2 = 52
6. The value of (34)3 is:
A. 3
B. 312
C. 37
D. None of the above
Answer: B
Explanation: By law of exponent:
(am)n = amn
(34)3 = 34×3 = 312
7. 32 x 42 is equal to:
A. 121
B. 49
C. 144
D. 156
Answer: C
Explanation: By exponent law;
am x bm = (ab)m
32 x 42 = (3×4)2 = 122 = 144
8. 57/67 will give the value:
A. (⅚)7
B. (⅚)0
C. (⅚)-7
D. (6/5)-7
Answer: A
Explanation: By exponent law:
am/bm = (a/b)m
57/67 = (⅚)7
9. 1000+200+50 is equal to
A. 125
B. 25
C. 1/125
D. 3
Answer: D
Explanation: By exponent law we know:
a0 = 1
1000 + 200 + 50 = 1+1+1 = 3
10. If (–3)m+1 × (–3)5 = (–3)7, then the value of m is:
A. 5
B. 7
C. 1
D. 3
Answer: C
Explanation: (–3)m+1 × (–3)5 = (–3)7
(-3)m+1+5 = (-3)7
(-3)m+6 = (-3)7
Since, base are equal on both the sides, hence if we compare the powers,
m+6 = 7
m=7-6 = 1
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