CBSE Class 8 Mathematics Exponents and Powers MCQs

Question: The value of log24 – log15 + log40 is equal to

a) 5log2

b) 7log2

c) 6log2

d) 8log2

Answer: 5log2

Question: The value of log105 + log32 – log80 –log21 is

a) log2

b) log4

c) log3

d) log5

Answer: log2

Question: The value of logmⁿ + logmⁿ⁺¹ + logm¹⁺²ⁿ is

a) 2logm

b) nlogm

c) logm

d) 3log m

Answer: 2logm

Question:

a) 11/2

b) 9/2

c) 7/2

d) 3

Answer: 11/2

Question:

a) 1

b) 3

c) 0

d) 2

Answer: 1

Question:

a) 1

b) 3

c) 0

d) 2

Answer: 1

Question:

a) 1

b) 2

c) None of these

d) 0

Answer: 1

Question:

a) 5

b) 4

c) 6

d) 7

Answer: 5

Question:

a) 28

b) not

c) 24

d) 27

Answer: 28

Question:

a) x²

b) not

c) x

d) x³

Answer: x²

Question:

a) 2√2

b) 2

c) 4

d) 3

Answer: 2√2

Question:

a)

b)

c) none of these

d)

Answer:

Question: The value of log108 – log54 – log2 is

a) 0

b) 1

c) 3

d) 2

Answer: 0

Question: The value of log3¹ + log3^{1/ 2} + log3^{1/ 4} + log3^1/8 +.... is equal to

a) log9

b) log3

c) log4

d) None of these

Answer: log9

Question:

a) 1

b) 3

c) 2

d) not

Answer: 1

Question:

a) 6

b) 4

c) 3

d) 5

Answer: 6

Question:

a) 2

b) b

c) 1

d) a

Answer: 2

Question:

a) 4

b) 1

c) 2

d) not

Answer: 4

Question: The value of log x^m yⁿ z^l + log xyz³− log x^m+1y − log yⁿz²− log z^l+1 is equal to 

a) none of these

b) –1

c) 1

d) 2

Answer: none of these

Question:

a) 2.7

b) 2.1

c) 3.0

d) 3.1

Answer: 2.7

Q1. Which of the following is the multiplicative inverse of (3 x 4)^-2

(i) 12
(ii)1/ 144
(iii) 144
(iv) 1 / 12

Q2.What is the value of ‘ m ‘ if (- 2)² x (- 5)³ = 50 m ?

(i) 10
(ii) -10
(iii) 100
(iv) - 100

Q3.What is the scientific notation of 0.0023 ?
(i) 2.3 X 10^-3
(ii) 23 X 10^-3
(iii) 2.3 X 10³
(iv) 23 X 10³

Q4.What is the usual form of 7.54 x 10^-3 ?
(i) 0.0754
(ii) 0.00754
(iii)0.000754
(iv) 0.0000754

Q5.What is the value of ( 30 + 40 + 50) ?
(i) 7
(ii) - 7
(iii) 3
(iv) - 3