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UPSC Civil Services 2013 Prelims General Studies Paper I

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Question : 70

Total: 100

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?

Gravity is the strongest of the four
Electromagnetism acts only on particles with an electric charge
Weak nuclear force causes radioactivity
Strong nuclear force holds protons and neutrons inside the nucleus of an atom

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