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Learn AIR FORCE MCQs with answers [Page 7 of Department 75]
61) 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 right?
(A) Gravity is the strongest out of the four forces
(B) Strong nuclear force holds protons and neutrons inside the nucleus of an atom
(C) Weak nuclear force causes radioactivity
(D) Electromagnetism acts only on particles with an electric charge
66) With reference to 'fly ash' produced by the power plants using coal as fuel. Which among the given statements is/are right?
1. Fly ash can be used in the production of bricks for building construction.
2. Fly ash can be used as a replacement for some of the Portland cement contents of concrete.
3. Fly ash is made up of silicon dioxide and calcium oxide only, and does not contain any toxic elements.
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