MCQ practice · SSC General Mathematics Board questions · Chapter 4: Exponents and Logarithms
The number 0.0124: Which of the following is correct?
- i. as a simple fraction, 31/2500
- ii. scientific form 1.24 × 10⁻²
- iii. characteristic of the common log 2̄
Think it through first, then pick an option.
- a i and ii
- b i and iii
- c ii and iii
- d i, ii and iii
Answer and explanation
Correct answer: d i, ii and iii
All three are true: 124/10000 = 31/2500; 0.0124 = 1.24 × 10⁻²; one zero, so the characteristic is 2̄.
Why the other options are wrong
- a i and ii: i and ii are true, but iii is true too: 0.0124 has 1 zero, so the characteristic is −(1 + 1) = 2̄.
- b i and iii: i and iii are true, but ii is true too: 0.0124 = 1.24 × 10⁻².
- c ii and iii: ii and iii are true, but i is true too: 0.0124 = 124/10000 = 31/2500.
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