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Chapter 8 of 28
Important Questions

Logarithms

ICSE · Class 9 · Mathematics

Most important questions from Logarithms for ICSE Class 9 Mathematics board exam 2026. MCQs, short answer, and long answer questions with marks.

34 questions25 flashcards5 concepts

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An infographic summarizing the three main laws of logarithms: product rule, quotient rule, and power rule, with examples.
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34 Questions·
multiple choicemultiple correcttext answer

Sample Questions

1multiple choice

Using log laws, simplify log 6 + log 4.

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log 24

Using the product law: log_a m + log_a n = log_a (m × n). So log 6 + log 4 = log(6 × 4) = log 24.

2multiple choice

Calculate log 100 - log 10.

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1

Using the quotient law: log_a m - log_a n = log_a (m/n). So log 100 - log 10 = log(100/10) = log 10 = 1 (since we're using base 10).

3multiple choice

Find the value of log₅ 5³.

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3

Using the power law: log_a (mⁿ) = n log_a m. So log₅ 5³ = 3 log₅ 5 = 3 × 1 = 3 (since log₅ 5 = 1).

4multiple correct

Which of the following are equal to 0? (Select all correct answers)

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log₅ 1, log₁₀ 1, log₂ 1

The logarithm of 1 to any base is always 0, because any number raised to the power 0 equals 1 (aº = 1). Therefore log₅ 1 = 0, log₁₀ 1 = 0, and log₂ 1 = 0. However, log₃ 3 = 1 and log₇ 7 = 1 because any number raised to power 1 equals itself.

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Frequently Asked Questions

What are the important topics in Logarithms for ICSE Class 9 Mathematics?
Logarithms covers several key topics that are frequently asked in ICSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Logarithms — ICSE Class 9 Mathematics?
Understand the core concepts first, then work through the 34 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many important questions are there in Logarithms?
There are 34 practice questions available for Logarithms. These cover multiple question types including MCQs, short answer, and long answer questions.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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