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heat can flow from a body at low temperature to a body at
higher temperature only when ........ is supplied from an
external source
A). Voltage B). Current C). work D). Mass
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Answer / prasd
according to thermodynamic,the heat can flow from low
temperature to high temperature by external work. for
example air conditioner
| Is This Answer Correct ? | 22 Yes | 4 No |
Answer / ajeet
its "B" Electric...
Thermo electric devices do this. Thermo electric devices "pull heat" to one side and leave the other side cooler. Radiating the heat from the hot side causes the cool side to become cooler. Some computer heat-sinks are made from this stuff, DC powered drink coolers are often made from this. In inverse you can generate electricity by adding heat to one side and cooling it on the other, I think it's Mercedes that's experimenting with replacing alternators with this stuff.
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / parth
the correct answer would be (d) mass.
see, when you put a hot iron rod in water, it will transfer
its heat to the water and cool down, without providing any
voltage, current or doing any work on it. the only thing
required is a sufficient amount of water. so sufficient
Mass of water is required.
| Is This Answer Correct ? | 3 Yes | 9 No |
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