Refrigerator COP = Q₂/W. If Q₂=300J, W=100J, COP is: MCQ with Answer and Explanation
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Question #1
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An iron needle sinks in water, whereas an iron ship floats. This is because:
Correct Answer: Option A
Explanation:
Though the ship is made of iron, it is hollow inside and traps a large volume of air. This makes the overall or average density of the ship less than the density of water. According to the law of floatation, an object floats if its average density is less than that of the fluid. A solid iron needle has a higher density than water, so it sinks.
Though the ship is made of iron, it is hollow inside and traps a large volume of air. This makes the overall or average density of the ship less than the density of water. According to the law of floatation, an object floats if its average density is less than that of the fluid. A solid iron needle has a higher density than water, so it sinks.
Question #2
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The nucleus of an atom contains
Question #3
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The scientist who invented the electric generator is
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