Which of the following prefix represents 10⁻¹⁵? MCQ with Answer and Explanation

Which of the following prefix represents 10⁻¹⁵?

A. Nano

B. Femto

C. Pico

D. Atto

Answer: Option B

Solution (By JKExamLibrary)

Femto (f) = 10⁻¹⁵. Pico (p) = 10⁻¹², nano (n) = 10⁻⁹, atto (a) = 10⁻¹⁸. The prefix chain: milli 10⁻³, micro 10⁻⁶, nano 10⁻⁹, pico 10⁻¹², femto 10⁻¹⁵, atto 10⁻¹⁸. Mnemonic: Femto is 'fifteen'.

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According to the Universal Law of Gravitation, the force of attraction between two bodies is inversely proportional to:

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Correct Answer: Option A

Explanation:
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B. Electrostatic energy

C. Heat

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Correct Answer: Option B

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