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51 Q) A person standing at the middle point of a wooden ladder which starts slipping between a vertical wall and the floor of a room, While continuing to remain in a vertical plane. The path traced by a person standing at the middle point of the slipping ladder is
56 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