Q: 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
Correct Answer: Option (a)
- Gravity, the weakest of the four forces, is about 10^-36 times the strength of the strong force. This weakness is easily demonstrable – on a dry day, when we rub a comb across shirt to give it static electricity and when we hold it over a piece of paper on a desk the piece of paper lifts off the desk. It takes an entire planet to keep the paper on the desk, but this force is easily overcome with everyday materials employing the electromagnetic force. Hence, option (a) is correct.
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