Question

17. If two rubber balloons are rubbed against a woollen sweater and are brought close together, they are found to - a) attract one another because their charges are similar b) repel one another because their charges are similar c) attract one another because their charges are opposite d) repel one another because their charges are opposite 18. In a vessel a large block of wood is floating while an iron nail submerged. In this case the statement that is true is - a) the weight of the wooden block is equal to the buoyant force acting on it b) the weight of the wooden block is less than the buoyant force acting on it C) the weight of the submerged iron nail is less than the buoyant force acting on it d) the iron nail submerged because water did not exert any upward force on it. 19. Which statement is NOT true about the specific heat of a substance? a) The magnitude of specific heat depends on the nature of the substance b) The magnitude of specific heat depends on the how the unit for measuring heat is defined c) The magnitude of specific heat does not depend on the how the unit for measuring heat is defined d) The unit of specific heat is calorie/gram °C.​

Answer 1

Answer:

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