MCQ practice · SSC Physics Board questions · Chapter 1: Physical Quantities and Their Measurements
Which is the smallest prefix used in SI units?
Think it through first, then pick an option.
- a Peta
- b Femto
- c Nano
- d Micro
Answer and explanation
Correct answer: b Femto
Femto = 10⁻¹⁵; its value is the smallest of the four given.
Why the other options are wrong
- a Peta: Peta = 10¹⁵ is a prefix on the large side; it is the largest of these, not the smallest.
- c Nano: Nano = 10⁻⁹, which is larger than femto (10⁻¹⁵).
- d Micro: Micro = 10⁻⁶, which is larger than femto (10⁻¹⁵).
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