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IMPORTANT
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Identify the graph(s) which correctly represents an isotherm at two temperatures and
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Important Questions on The First Law of Thermodynamics
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JEE Main
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Two pistons can move freely inside a horizontal cylinder having two sections of unequal cross-sections. The pistons are joined by an inextensible, light string and some gas is enclosed between the pistons. On heating the system, the piston will
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JEE Main
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Two different masses of a gas and are heated separately in vessels of equal volume. The curve for mass makes angle an with -axis and that for mass takes angle an with -axis then
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An ideal gas mixture filled inside a balloon expands according to the relation constant. The temperature inside the balloon is
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A container of volume is divided into two equal compartments by a partition. One of these compartments contains an ideal gas at . The other compartment is vacuum. The whole system is thermally isolated from its surroundings. The partition is removed in the gas container. Its temperature now would be
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JEE Main
IMPORTANT
One mole of helium is adiabatically expanded from its initial state to its final state . The decrease in the internal energy associated with this expansion is equal to
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JEE Main
IMPORTANT
One mole of a perfect gas in a cylinder fitted with a piston has a pressure volume and temperature . If the temperature is increased by keeping pressure constant, then increase in volume is
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Unit mass of a liquid with volume is completely changed into a gas of volume at a constant external pressure and temperature . If the latent heat of evaporation is , then the increase in the internal energy item is
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JEE Main
IMPORTANT
A gas mixture consists of moles of oxygen and moles of argon at temperature . Neglecting all vibrational modes, the total internal energy of the system is
