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UPSC 2013: The known forces of nature can be divided into four classes, viz., gravity, electromagnetism, weak nuclear force and strong nuclear force. With reference to them, which one of the following statements is not correct?
(a)Gravity is the strongest of the four
(b)Electromagnetism acts only on particles with an electric charge
(c)Weak nuclear force causes radioactivity
(d)Strong nuclear force holds protons and neutrons inside the nucleus of an atom
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Not attemptedCorrect Answer: (a) Gravity is the strongest of the four
Gravity is actually the weakest (≈10-40 of the strength of electromagnetism), whereas the strong nuclear force is the strongest. Electromagnetism acts only on electrically-charged particles, the weak force governs β-decay (hence radioactivity), and the strong force binds protons and neutrons in the nucleus. Hence statement (a) is the only one that is not correct. ([science.nasa.gov](https://science.nasa.gov/universe/overview/forces?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2013 Science & Technology question?▼
The correct answer is option (a): Gravity is the strongest of the four. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Physics question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2013, GS Paper 1, as Question 95. It falls under Science & Technology > Physics.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Physics?▼
UPSC has asked 104 questions from Physics (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.