Logarithms : Aptitude Questions and Answers

Logarithms questions and answers are most important for all competitive exams and entrance tests. In this section, you will find many types of logarithms questions and answers. Practice these questions and answers that will help you crack any competitive exam like SSC, IBPS, PO, RBI, PSC, RAIL, PSU, and many more exams.

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Logarithms Questions and Answers

Q1. If $\mathbf{log_{10}2=0.3010}$ and $\mathbf{log_{10}7=0.8451}$ , then the value of $\mathbf{log_{10}2.8}$ is :

A. 3.4471

B. 2.4471

C. 0.4471

D. 1.4471

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Correct Answer : 0.4471

Q2. The value of $\mathbf{log_{2}16}$ is :

A. 4

B. 8

C. 1/8

D. 16

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Correct Answer : 4

Q3. If log 27 = 1.431, then the value of log 9 is :

A. 0.958

B. 0.934

C. 0.954

D. 0.945

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Correct Answer : 0.954

Q4. If $\mathbf{log2=0.30103}$ , the number of digits in

$\mathbf{2^{64}}$ is :

A. 18

B. 19

C. 20

D. 21

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Correct Answer : 20

Q5. If $\mathbf{log_{10}2=0.3010}$ , the value of $\mathbf{log_{10}5}$ is :

A. 0.6990

B. 0.7525

C. 0.8911

D. 0.3241

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Correct Answer : 0.6990

Q6. If $\mathbf{log_{x}}$ 4 = 0.4, then the value of x is :

A. 32

B. 16

C. 1

D. 4

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Correct Answer : 32

Q7. If $\mathbf{log_{10}2=0.3010}$ , the value of $\mathbf{log_{10}80}$ is :

A. 1.6020

B. 3.9030

C. 3.5080

D. 1.9030

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Correct Answer : 1.9030

Q8. If $\mathbf{log_{a}(ab)=x}$ , then $\mathbf{log_{b}(ab)}$ is :

A. x/1-x

B. x/x-1

C. 1/x

D. x/x+1

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Correct Answer : x/x-1

Q9. If $\mathbf{log_{10}7=a}$ , then $\mathbf{log_{10}(\frac{1}{70})}$ is equal to :

A. 1/10a

B. (1 + a)-1

C. -(1 + a)

D. a/10

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Correct Answer : -(1 + a)

Q10. If $\mathbf{log(0.57)=1.756}$ , then the value of $\mathbf{log57+log(0.57)^{3}+log\sqrt{0.57}}$ $\sqrt{0.57}$ is :

A. 1.902

B. 1.146

C. 0.902

D. 2.146

SHOW ANSWER

Correct Answer : 0.902

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