EASY
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IMPORTANT
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The efficiency of a Carnot engine working between and is
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Important Questions on The First Law of Thermodynamics
EASY
JEE Main
IMPORTANT
The efficiency of Carnot heat engine is , when the temperature of the source is and that of sink is . The efficiency of another Carnot heat engine is also . The temperatures of source and sink of the second engine respectively are
MEDIUM
JEE Main
IMPORTANT
A Carnot engine having an efficiency of is being used as a refrigerator. If the work done on the refrigerator is , then the amount of heat absorbed from the reservoir at lower temperature is,
MEDIUM
JEE Main
IMPORTANT
A thermodynamic cycle is shown on a diagram.
The - diagram that best describes this cycle is (diagrams are schematic and not to scale),
HARD
JEE Main
IMPORTANT
A litre of dry air at STP expands adiabatically to a volume of . If , the work done by air is [take air to be an ideal gas],
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JEE Main
IMPORTANT
Under an adiabatic process, the volume of an ideal gas gets doubled. Consequently, the mean collision time between the gas molecule changes from to . If for this gas, then a good estimate for is given by,
MEDIUM
JEE Main
IMPORTANT
In a process, temperature and volume of one mole of an ideal mono-atomic gas are varied according to the relation, , where is a constant. In this process, the temperature of the gas is increased by . The amount of heat absorbed by gas is (where is gas constant),
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JEE Main
IMPORTANT
The given diagram shows four processes, i.e., isochoric, isobaric, isothermal and adiabatic. The correct assignment of the processes in the same order is given by,
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JEE Main
IMPORTANT
An ideal mono-atomic gas at expands adiabatically to twice its volume. The final temperature of gas is,
