Thermodynamics

The temperature at which the vapour pressure of a liquid becomes equal to the external (atmospheric) pressure is known as its

Which of the following is not a thermodynamical coordinate?

Volume of gas becomes four times if temperature becomes

Slope of PV and V for an isobaric process will be

In a given process on an ideal gas, dW=0 and dQ<0. Then for the gas

Amount of heat required to raise the temperature of a body through 1 K is called its

An engine has an efficiency of 1/6. When the temperature of sink is reduced by 62⁰C, its efficiency is doubled. Temperature of the source is

A liquid boils when its vapour pressure equals

If Q, E and W denote respectively the heat added, change in internal energy and the work done in a closed cyclic process, then:

In thermodynamics processes which of the following statements is not true?

The internal energy change in a system that has absorbed 2 kcals of heat and done 500J of work is:

If ∆U and ∆W represent the increase in internal energy and work done by the system respectively in a thermodynamical process, which of the following is true?

An ideal gas expands in such a manner that its pressure and volume can be related by equation PV²=constant. During this process, the gas is

When 1 kg of ice at 0⁰C melts to water at 0⁰C, the resulting change in its entropy, taking latent heat of ice to be 80 cal/⁰C, is

A bottle full of water in a space ship at 30⁰C is carried on the moon. If the bottle is opened on the surface of the moon, then

Heat is not being exchanged in a body. If its internal energy is increased, then

During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of Cp/Cv for the gas is

In a thermodynamic system, working substance is ideal gas. Its internal energy is in the form of

The work done in which of the following processes is zero?

Two Carnot engine A and B are operated in series. The engine A receives that heat from the source at temperature T₁ and rejects the heat to the sink at temperature T. The second engine B receives the heat at temperature T and rejects to its sink at temperature T₂. For what value of T the efficiencies of the two engines are equal?

The work done in which of the following processes is equal to the change in internal energy of the system?

In which process, the P-V indicator diagram is a straight line parallel to volume axis?

Temperature is a measurement of coldness or hotness of an object. This definition is based on

Which of the following parameters does not characterize the thermodynamic state of matter?

In adiabatic expansion, product of PV

34 gram of water at 30⁰C is poured into a calorimeter at 15⁰C. The temperature of water is 20⁰C when equilibrium is achieved. The water equivalent of the calorimeter is

A bubble is rising from bottom of a lake. The volume of bubble becomes 8 times as it reaches the top. The atmospheric pressure is equal to H, The depth of the lake

When you make ice cubes, the entropy of water

The work of 146 kJ is performed in order to compress one kilo mole of gas adiabatically and in this process the temperature of the gas increases by 7⁰C. The gas is (R=8.3 J mol⁻¹ K⁻¹)

Ist law of thermodynamics is based on

If the r.m.s. velocity of a gas is v, then

An adiabatic process occurs at constant

An engine has an efficiency of 1/6. when the temperature of sink is reduced by 62⁰C, its efficiency is doubled. Temperatures of the source is

A Carnot engine, having an efficiency of η=1/10 as heat engine, is used as a refrigerator. If the work done on the system is 10J, the amount of energy absorbed from the reservoir at lower temperature is

If Q,E and W denote respectively the heat added, change in internal energy and the work done in a closed cycle process, then

In which of the processes, does the internal energy of the system remain constant?

In the adiabatic compression, the decrease in volume associated with

If a solid ball of metal has a concentric spherical cavity with in it if the ball is heated the volume of the cavity will