The value of 25 log 5 4 is? 16 5 25 None of these Exp. = 25 log54 = 52 log54 = 5

CuriousTab

C Programming C# Programming C++ Programming Database Java Programming Networking

Biochemical Engineering Biochemistry Biotechnology Chemical Engineering Civil Engineering Computer Science Digital Electronics Electrical Engineering Electronics Electronics and Communication Engineering Mechanical Engineering Microbiology Technical Drawing

Current Affairs General Knowledge

Data Interpretation Logical Reasoning Non Verbal Reasoning Verbal Ability Verbal Reasoning

AIEEE Bank Exams CAT GATE IIT JEE TOEFL

Analyst Bank PO Database Administrator IT Trainer Network Engineer Project Manager Software Architect

Discussion

Home ‣ Aptitude ‣ Logarithm Comments

Question
The value of 25 log ₅ 4 is?
Options
A. 16
B. 5
C. 25
D. None of these

Correct Answer

16

Explanation

Exp. = 25 log₅4 = 5² log₅4
= 5 log₅ 4²
= 16

Logarithm problems

Search Results

1.
If log ₁₀ {log ₁₀[log ₁₀(log ₁₀N )]} = 0, then the value of N is?
Options
A. 1010
B. 101010
C. 10-10
D. 10102

Discuss

Correct Answer: 101010

Explanation:

If log₁₀{log₁₀[log₁₀(log₁₀N)]} = 0
? log₁₀{log₁₀(log₁₀N)} = 1
? log₁₀(log₁₀N) = 10
? log₁₀^N = 10¹⁰
? N = 10¹⁰¹⁰

2.
log _-1/3 81 is equal to?
Options
A. - 27
B. - 4
C. 4
D. 127

Discuss

Correct Answer: 4

Explanation:

Let log_-1/381 = x
? 81 = (-1/3)^x
? 3⁴ = (-1/3)^x = 3^-x
? x = -4

3.
log ₁₀x + log ₁₀y = z, then x is equal to?
Options
A. z / y
B. 10 / z
C. 102 / x
D. None of these

Discuss

Correct Answer: None of these

Explanation:

log₁₀xy = z
? xy = 10^z
? x = 10^z/y

4.
log ₁₀10 + log ₁₀100 + log ₁₀1000 + log ₁₀10000 + log ₁₀100000 is equal to?
Options
A. 15
B. log 11111
C. log101111
D. 14 log10 100

Discuss

Correct Answer: 15

Explanation:

Given Exp. = log₁₀10 + log₁₀100 + log₁₀1000 + log₁₀10000 + log₁₀100000
= 1 + 2 + 3 + 4 + 5
= 15

5.
Find the value of log ₉ 81 - log ₄ 32?
Options
A. 1 / 2
B. - 3 / 2
C. - 1 / 2
D. 2

Discuss

Correct Answer: - 1 / 2

Explanation:

log₉ 81 - log₄ 32 = log₃² 3⁴ - log₂² 2⁵
= 4/2 - 5/2 = -1/2

6.
The value of log ₁₀ 0.000001 is?
Options
A. 6
B. - 6
C. 5
D. - 5

Discuss

Correct Answer: - 6

Explanation:

Exp. = log₁₀ 10^-6 = -6

7.
The value of log ₁₀ (0.00001) is?
Options
A. - 5
B. - 6
C. - 7
D. None of these

Discuss

Correct Answer: - 5

Explanation:

Exp. = log₁₀ 10^-5 = -5

8.
The value of log ₆ log ₅ 15625 is?
Options
A. 1
B. 2
C. 3
D. None of these

Discuss

Correct Answer: 1

Explanation:

log₆ log₅15625 = log₆ log₅(5)⁶
= log₆6(log₅5) = 1

9.
If log ₁₀₀₀₀x = -1/4, then x is?
Options
A. 1 / 100
B. 1 / 10
C. 1 / 20
D. None of these

Discuss

Correct Answer: 1 / 10

Explanation:

? log₁₀⁴x = -1/4
? x = (10⁴)^-1/4
= 1/10

10.
log _x (16/25) = -1/2, then x is?
Options
A. 625 / 256
B. 256 / 625
C. 526 / 265
D. None of these

Discuss

Correct Answer: 625 / 256

Explanation:

? log_x(16/25) = -1/2
? 16/25 = (x)^-1/2 = 1/x^1/2
? x = 625/256

Comments

Enter a new Comment

More in Aptitude:

Alligation or Mixture Approximation Area Average Banker's Discount Boats and Streams Calendar Chain Rule Clock Compound Interest Decimal Fraction Discount Elementary Algebra Find the Missing Character Height and Distance Linear Equation Logarithm Logic Number System Numbers Odd Man Out and Series Order of Magnitude Partnership Percentage Permutation and Combination Pipes and Cistern Plane Geometry Probability Problems on Ages Problems on H.C.F and L.C.M Problems on Numbers Problems on Trains Profit and Loss Quadratic Equation Races and Games Ratio and Proportion Sets and Functions Sequential Output Tracing Simple Interest Simplification Square Root and Cube Root Statistics Stocks and Shares Surds and Indices Time and Distance Time and Work True Discount Unitary Method Volume and Surface Area Work and Wages

Aptitude

Time and Distance
Volume and Surface Area
Problem on Trains
Permutation and Combination

Engineering

Civil Engineering
Computer Science
Mechanical Engineering
Technical Drawing

Programming

C Programming
C# Programming
C++ Programming
Java Programming

Reasoning

Logical Reasoning
Non Verbal Reasoning
Verbal Ability
Verbal Reasoning

CuriousTab

CuriousTab

Discussion

The value of 25 log 5 4 is?

Logarithm problems

Search Results

More in Aptitude:

Aptitude

Engineering

Programming

Reasoning

Links

Social

The value of 25 log ₅ 4 is?