21. A boat carrying steel balls is floating on the surface of water in a tank. If the balls are thrown into the tank one by one, how will it affect the level of water
(a) It will remain unchanged
(b) It will rise
(c) It will fall
(d) First it will first rise and then fall
Answer-c
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a