Logarithm MCQ Questions & Answers

Logarithm MCQs : This section focuses on the "Logarithm". These Multiple Choice Questions (MCQs) should be practiced to improve the Logarithm skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

If log10 7 = a, then log10 (1/70) is equal to:

A. - (1 + a)

B. (1 + a)^(-1)

C. a/10

D. 1/10a

Question 2

If log 27 = 1.431, then the value of log 9 is:

A. 0.934

B. 0.945

C. 0.954

D. 0.958

Question 3

If log 2 = 0.3010 and log 3 = 0.4771, the value of log5 512 is:

A. 2.870

B. 2.967

C. 3.876

D. 3.912

Question 4

The value of log2 16 is:

A. 1/8

B. 4

C. 8

D. 16

Question 5

If log10 5 + log10 (5x + 1) = log10 (x + 5) + 1, then x is equal to:

A. 1

B. 3

C. 5

D. 10

Question 6

If log10 2 = 0.3010, then log2 10 is equal to:

A. 699/301

B. 1000/301

C. 0.3010

D. 0.6990

Question 7

If log 2 = 0.30103, the number of digits in 2^64 is:

A. 18

B. 19

C. 20

D. 21

Question 8

log root(8)/log 8 is equal to:

A. 1/ root(8)

B. 1/4

C. 1/2

D. 1/8

Question 9

If logx y = 100 and log2 x = 10, then the value of y is:

A. 2^10

B. 2^100

C. 2^1000

D. 2^10000

Question 10

If a^x = b^y, then:

A. log a/b = x/y

B. log a/ log b= x/y

C. log a/ log b= y/x

D. None of these

Question 11

If log a/b + log b/a = log (a + b), then:

A. a + b = 1

B. a - b = 1

C. a = b

D. a^2 - b^2 = 1

Question 12

If log10 2 = 0.3010, the value of log10 80 is:

A. 1.6020

B. 1.9030

C. 3.9030

D. None of these

Question 13

Which of the following statements is not correct?

A. log10 10 = 1

B. log (2 + 3) = log (2 x 3)

C. log10 1 = 0

D. log (1 + 2 + 3) = log 1 + log 2 + log 3

Question 14

The value of (1/log3 60 + 1/log4 60 + 1/log5 60) is:

A. 0

B. 1

C. 5

D. 60

Question 15

If logx (9/16) = -1/2 , then x is equal to:

A. -(3/4)

B. 3/4

C. 81/256

D. 256/81

Question 16

If log(a/b) + log(b/a) = log (a + b), then:

A. a + b = 1

B. a - b = 1

C. a = b

D. None of the above