# A Carnot’s engine works as a refrigerator between $250 \mathrm{~K}$ and $300 \mathrm{~K}$. It receives 500 cal heat from the reservoir at the lower temperature. The amount of work done in each cycle to operate the refrigerator is:

Question:

A Carnot’s engine works as a refrigerator between $250 \mathrm{~K}$ and $300 \mathrm{~K}$. It receives 500 cal heat from the reservoir at the lower temperature. The amount of work done in each cycle to operate the refrigerator is:

1. $420 \mathrm{~J}$

2. $2100 \mathrm{~J}$

3. $772 \mathrm{~J}$

4. $2520 \mathrm{~J}$

JEE Main Previous Year Single Correct Question of JEE Main from Physics Termodynamics chapter.

JEE Main Previous Year Online April 15, 2018

Correct Option: 1

Solution:

### Related Questions

• A gas can be taken from $A$ to $B$ via two different processes ACB and ADB.

When path $A C B$ is used $60 \mathrm{~J}$ of heat flows into the system and $30 \mathrm{~J}$ of work is done by the system. If path ADB is used work done by the system is $10 \mathrm{~J}$. The heat Flow into the system in path ADB is :

View Solution

• $200 \mathrm{~g}$ water is heated from $40^{\circ} \mathrm{C}$ to $60^{\circ} \mathrm{C}$. Ignoring the slight expansion of water, the change in its internal energy is close to (Given specific heat of water $=4184 \mathrm{~J} / \mathrm{kgK}$ ):

View Solution

• A gas is compressed from a volume of $2 \mathrm{~m}^{3}$ to a volume of $1 \mathrm{~m}^{3}$ at a constant pressure of $100 \mathrm{~N} / \mathrm{m}^{2}$. Then it is heated at constant volume by supplying $150 \mathrm{~J}$ of energy. As a result, the internal energy of the gas:

View Solution

• An insulated container of gas has two chambers separated by an insulating partition. One of the chambers has volume $V_{1}$ and contains ideal gas at pressure $P_{1}$ and temperature $T_{1}$. The other chamber has volume $V_{2}$ and contains ideal gas at pressure $P_{2}$ and temperature $T_{2}$. If the partition is removed without doing any work on the gas, the final equilibrium temperature of the gas in the container will be

View Solution

• When a system is taken from state i to state $f$ along the path iaf, it is found that $Q=50$ cal and $W=20$ cal. Along the path ibf $Q=36$ cal. $W$ along the path ibf is

View Solution

• A system goes from $A$ to $B$ via two processes I and II as shown in figure. If $\Delta U_{1}$ and $\Delta U_{2}$ are the changes in internal energies in the processes I and II respectively, then

View Solution

• Which of the following is incorrect regarding the first law of thermodynamics?

View Solution

• Three different processes that can occur in an ideal monoatomic gas are shown in the P vs V diagram. The paths are lebelled as $A \rightarrow B, A \rightarrow C$ and $A \rightarrow D$. The changein internal energies during these process are taken as $E_{A B}$, $\mathrm{E}_{\mathrm{AC}}$ and $\mathrm{E}_{\mathrm{AD}}$ and the workdone as $\mathrm{W}_{\mathrm{AB}}, \mathrm{W}_{\mathrm{AC}}$ and $\mathrm{W}_{\mathrm{AD}}$. The correct relation between these parameters are :

View Solution

• In an adiabatic process, the density of a diatomic gas becomes 32 times its initial value. The final pressure of the gas is found to be $n$ times the initial pressure. The value of $n$ is:

View Solution

• Match the thermodynamic processes taking place in a system with the correct conditions. In the table : $\Delta Q$ is the heat supplied, $\Delta W$ is the work done and $\Delta U$ is change in internal energy of the system.

View Solution

error: Content is protected !!