CA Foundation · Quantitative Aptitude · Ratio and Proportion, Indices and Logarithms
The value of log₁₀ 0.001 is:
The value is -3 because 0.001 can be written as 10 raised to the power -3, and the common logarithm of a power of 10 is simply that index. Hence log₁₀ 0.001 equals -3.
- A-3Correct
- B3
- C-2
- D0.001
Explanation
0.001 = 10^(-3), so log₁₀ 0.001 = -3. Choosing 3 ignores the negative sign of the index. Choosing -2 miscounts the decimal places.
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