GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The iron nail’s temperature will increase while that of water will decrease.
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The iron nail’s temperature will decrease while that of water will increase.
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Both the iron nail’s and the water’s temperature will increase.
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Both the iron nail’s and the water’s temperature will decrease.
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Detailed explanation-1: -Answer: hot iron nail is at a higher temperature than cold water. When the hot iron nail is dipped in cold water, heat from the nail flows into the cold water. Since heat from nail is transferred to water, temperature of water rises and temperature of nail falls.
Detailed explanation-2: -Over time the metal will cool and the water will heat up. Eventually the two objects will have the same temperature. They are then said to be in thermal equilibrium with one another. During the intervening time the hot metal is transfering energy to the water.
Detailed explanation-3: -When an iron nail is kept in water for a few days, we can observe a reddish-brown coating on the nails. This process is called rusting and it is a chemical change.
Detailed explanation-4: -The heat from the iron will be absorbed by the water which will undergo a phase change to steam. The temperature of the iron will drop until it is in equilibrium with the water-100°C and the water will not get hotter, but it will produce more steam.
Detailed explanation-5: -The weight of the water displaced by the ship is equal to its weight, so it floats. Whereas the weight of the water displaced by the iron nail is less than its weight so the iron nail sinks.