Q. By burning fuels, the stored chemical energy in these fuels is converted to

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Q. The SI unit of energy is

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Q. In its raised position, a hammer possesses

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Q. The energy stored in fossil fuels like coal and oil is

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Q. The energy output is always less than the energy input, because

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Q. Potential energy can be converted into

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Q. When energy is converted from one form to another or transferred from one body to another, the total amount

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Q. Solar energy is converted by plants through the process of photosynthesis into

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Q. The efficiency of the power station is only about

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Q. Wind and waves can be used to turn turbines that convert kinetic energy into

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Q. Energy that is stored is known as

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Q. When an object is raised to a certain height above the ground, it has

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Q. During the series of transfers of energy, the energy wasted is about

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Q. When the hammer falls, the gravitational potential energy is converted to

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Q. From surroundings, evaporation requires

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Q. The difference between boiling and evaporation is that

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Q. In the process of evaporation, thermal energy is supplied by

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Q. The rate of evaporation increases when temperature

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Q. The specific latent heat of vaporization is 2.25 × 10⁶ J kg⁻¹.If a man generates 800 J of heat every second by running, and half heat is lost from the body by evaporation, what is the mass of water evaporated in a 2 hour running?

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Q. Evaporation is a

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