Which is the correct statement ?
(1) For an isothermal change PV = constant
(2) In an isothermal process the change in internal energy must be equal to the work done
(3) For an adiabatic change , where γ is the ratio of specific heats
(4) In an adiabatic process work done must be equal to the heat entering the system
The slopes of isothermal and adiabatic curves are related as -
(1) Isothermal curve slope = adiabatic curve slope
(2) Isothermal curve slope = γ × adiabatic curve slope
(3) Adiabatic curve slope = γ × isothermal curve slope
(4) Adiabatic curve slope = isothermal curve slope
During the adiabatic expansion of 2 moles of a gas, the internal energy of the gas is found to decrease by 2 joules, the work done during the process by the gas will be equal to -
(1) 1 J
(2) –1 J
(3) 2 J
(4) – 2 J
If denotes the ratio of two specific heats of a gas, the ratio of slopes of adiabatic and isothermal PV curves at their point of intersection is
(1)
(2)
(3)
(4)
Air in a cylinder is suddenly compressed by a piston, which is then maintained at the same position. With the passage of time
1. | The pressure decreases |
2. | The pressure increases |
3. | The pressure remains the same |
4. | The pressure may increase or decrease depending upon the nature of the gas |
The adiabatic Bulk modulus of a perfect gas at pressure P is given by
(1) P
(2) 2P
(3) P/2
(4) γ P
An adiabatic process occurs at constant
(1) Temperature
(2) Pressure
(3) Heat
(4) Temperature and pressure
For adiabatic processes
(1) = constant
(2) = constant
(3) = constant
(4) = constant
An ideal gas is expanded adiabatically at an initial temperature of 300 K so that its volume is doubled. The final temperature of the hydrogen gas is (γ = 1.40) [Given : ]
(1) 227.36 K
(2) 500.30 K
(3) 454.76 K
(4) –47°C
In an adiabatic expansion of a gas, if the initial and final temperatures are \(T_1\) and \(T_2\), respectively, then the change in internal energy of the gas is:
1. \(\frac{nR}{\gamma-1}(T_2-T_1)\)
2. \(\frac{nR}{\gamma-1}(T_1-T_2)\)
3. \(nR ~(T_1-T_2)\)
4. Zero