Air in a cylinder is suddenly compressed by a piston, which is then maintained at the same position. With the passage of time
A
The pressure decreases
B
The pressure increases
C
The pressure remains the same
D
The pressure may increase or decrease depending upon the nature of the gas
AIIMS 2000, Easy
Download our app for free and get started
A
The pressure decreases
a (a) Due to compression the temperature of the system increases to a very high value.
This causes the flow of heat from system to the surroundings, thus decreasing the temperature.
This decrease in temperature results in decrease in pressure.
Download our app
and get started for free
Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
One mole of an ideal gas at an initial temperature of $T\, K$ does $6\, R\, joules$ of work adiabatically. If the ratio of specific heats of this gas at constant pressure and at constant volume is $\frac{5}{3}$ , the final temperature of gas will be
A Carnot engine with efficiency $50\,\%$ takes heat from a source at $600\,K$. In order to increase the efficiency to $70\,\%$, keeping the temperature of sink same, the new temperature of the source will be $.........\,K$
Two moles of monoatomic gas is expanded from $(P_0, V_0)$ to $(P_0 , 2V_0)$ under isobaric condition. Let $\Delta Q_1$, be the heat given to the gas, $\Delta W_1$ the work done by the gas and $\Delta U_1$ the change in internal energy. Now the monoatomic gas is replaced by a diatomic gas. Other conditions remaining the same. The corresponding values in this case are $\Delta Q_2 , \Delta W_2 , \Delta U_2$ respectively, then
A Carnot engine has efficiency of $50 \%$. If the temperature of sink is reduced by $40^{\circ} C$, its efficiency increases by $30 \%$. The temperature of the source will be$....K$
A thin piece of thermal conductor of constant thermal conductivity insulated on the lateral sides connects two reservoirs which are maintained at temperatures $T_{1}$ and $T_{2}$ as shown in the figure alongside. Assuming that the system is in steady state, which of the following plots best represents the dependence of the rate of change of entropy on the ratio of $T_{1} / T_{2}$ ?
Three moles of an ideal gas $\left( {{C_P} = \frac{7}{2}R} \right)$ at pressure ${P_A}$ and temperature ${T_A}0$ is isothermally expanded to twice its initial volume. It is then compressed at constant pressure to its original volume. Finally the gas is compressed at constant volume to its original pressure ${P_A}.$ The correct $P-V$ and $P-T$ diagrams indicating the process are