Logarithms
ICSE · Class 9 · Mathematics
Practice quiz for Logarithms — ICSE Class 9 Mathematics. MCQs and questions with answers to test your preparation.
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Find the value of log₂ 8.
Convert 3⁻² = 1/9 to logarithmic form.
Calculate log₁₀ 1000.
If log₄ x = 2, find the value of x.
Sample Questions
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.
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).
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).
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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