Chirkut.বাংলা

MCQ practice · SSC Physics Board questions · Chapter 1: Physical Quantities and Their Measurements

Rajshahi Board 2022

Which one of the following is a nanosecond?

Think it through first, then pick an option.

  1. a 10⁻⁶ s
  2. b 10⁻⁹ s
  3. c 10⁶ s
  4. d 10⁹ s
Answer and explanation

Correct answer: b 10⁻⁹ s

Nano (n) = 10⁻⁹, so one nanosecond = 10⁻⁹ s.

Why the other options are wrong

  • a 10⁻⁶ s: 10⁻⁶ s is a microsecond (μs); nano (n) is 10⁻⁹.
  • c 10⁶ s: 10⁶ s is a megasecond (Ms); nano is on the small side, so its power is negative.
  • d 10⁹ s: 10⁹ s is a gigasecond (Gs); nano is on the small side, so its power is negative.

More board questions on this topic