Thermodynamics ...

\"Heat cannot by itself flow from a body at lower temperature to a body at higher temperature\" is a statement or consequence of

An ideal heat engine working between temperature T₁ and T₂ has an efficiency η, the new efficiency if both the source and sink temperature are doubled, will be

An ideal gas heat engine operates in Carnot cycle between 227°C and 127°C. It absorbs 6 × 10⁴ cals of heat at higher temperature. Amount of heat converted to work is

When you make ice cubes, the entropy of water

Choose the incorrect statement from the following
S1 :The efficiency of a heat engine can be 1, but the coefficient of performance of a refrigerator can never be infinity
S2 : The first law of thermodynamics is basically the principle of conservation of energy
S3 :The second law of thermodynamics does not allow several phenomena consistent with the first law
S4 :A process, whose sole result is the transfer of heat from a colder object to a hotter object is impossible

A closed hollow insulated cylinder is filled with gas at 0°C and also contains an insulated piston of negligible weight and negligible thickness at the middle point. The gas on one side of the piston is heated to 100°C. If the piston moves 5 cm, the length of the hollow cylinder is

An insulator container contains 4 moles of an ideal diatomic gas at temperature T. Heat Q is supplied to this gas, due to which 2 moles of the gas are dissociated into atoms but temperature of the gas remains constant. Then

The temperature of a hypothetical gas increases to √2 times when compressed adiabatically to half the volume. Its equation can be written as

Two Carnot engines A and B are operated in succession. The first one, A receives heat from a source at T₁ = 800 K and rejects to sink at T₂ K. The second engine B receives heat rejected by the first engine and rejects to another sink at T₃ = 300 K. If the work outputs of two engines are equal, then the value of T₂ is

When an ideal gas (γ = 5/3) is heated under constant pressure, then what percentage of given heat energy will be utilized in doing external work?