Heat and Thermodynamics PYQs - Last 10 Years

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Practice 28 KCET Physics questions from Heat and Thermodynamics. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.

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Last 10 Years Heat and Thermodynamics Questions

Showing 28 of 28 filtered questions.

1Heat And Thermodynamics

The graph of pressure P and volume V of $1$ mole of an ideal gas at constant temperature is

2Heat And Thermodynamics

In thermodynamic processes, which of the following statements is not true?

3Heat And Thermodynamics

Following are statements of a few processes taking place in nature.I. Free expansion of a gasII. The combustion of a mixture of petrol and air ignited by a sparkIII. The leaking of gas from the kitchen cylinder.IV. The transfer of heat from...

4Heat And Thermodynamics

Three metal rods of the same material and identical in all respects are joined as shown in the figure. The temperatures at the ends of these rods are maintained as indicated. Assuming no heat energy loss occurs through the curved surfaces o...

5Heat And Thermodynamics

At $27^{\circ} \mathrm{C}$ temperature, the mean kinetic energy of the atoms of an ideal gas is $\mathrm{E}_1$. If the temperature is increased to $327^{\circ} \mathrm{C}$, then the mean kinetic energy of the atoms will be

6Heat And Thermodynamics

A gas is taken from state A to state B along two different paths 1 and 2. The heat absorbed and work done by the system along these two paths are $Q_1$ and $Q_2$ and $W_1$ and $W_2$ respectively. Then

7Heat And Thermodynamics

One mole of an ideal monoatomic gas is taken round the cyclic process MNOM. The work done by the gas is

8Heat And Thermodynamics

The ratio of molar specific heats of oxygen is

9Heat And Thermodynamics

A solid cube of mass $m$ at a temperature $\theta_0$ is heated at a constant rate. It becomes liquid at temperature $\theta_1$ and vapour at temperature $\theta_2$. Let $s_1$ and $s_2$ be specific heats in its solid and liquid states respec...

10Heat And Thermodynamics

Pressure of ideal gas at constant volume is proportional to .........

11Heat And Thermodynamics

The speed of sound in an ideal gas at a given temperature \(T\) is \(v\). The rms speed of gas molecules at that temperature is \(v_{\text {rms }}\). The ratio of the velocities \(v\) and \(v_{\text {rms }}\) for helium and oxygen gases are...

12Heat And Thermodynamics

The \(p\)-\(V\) diagram of a Carnot's engine is shown in the graph below. The engine uses 1 mole of an ideal gas as working substance. From the graph, the area enclosed by the \(p\)-\(V\) diagram is [The heat supplied to the gas is 8000 J]

13Heat And Thermodynamics

\(100 \mathrm{~g}\) of ice at \(0^{\circ} \mathrm{C}\) is mixed with \(100 \mathrm{~g}\) of water at \(100^{\circ} \mathrm{C}\). The final temperature of the mixture is
[Take, \(L_f=3.36 \times 10^5 \mathrm{~J} \mathrm{~kg}^{-1}\) and $$S_w...

14Heat And Thermodynamics

"Heat cannot be flow itself from a body at lower temperature to a body at higher temperature". This statement corresponds to

15Heat And Thermodynamics

Which of the following curves represent the variation of coefficient of volume expansion of an ideal gas at constant pressure?

16Heat And Thermodynamics

A number of Carnot engines are operated at identical cold reservoir temperatures \((T_L)\). However, their hot reservoir temperatures are kept different. A graph of the efficiency of the engines versus hot reservoir temperature \((T_H)\) is...

17Heat And Thermodynamics

A gas mixture contains monoatomic and diatomic molecules of 2 moles each. The mixture has a total internal energy of (symbols have usual meanings)

18Heat And Thermodynamics

In an adiabatic expansion of an ideal gas the product of pressure and volume

19Heat And Thermodynamics

A certain amount of heat energy is supplied to a monoatomic ideal gas which expands at constant pressure. What fraction of the heat energy is converted into work?

20Heat And Thermodynamics

A sphere, a cube and a thin circular plate all of same material and same mass initially heated to same high temperature are allowed to cool down under similar conditions. Then, the

21Heat And Thermodynamics

A thermodynamic system undergoes a cyclic process \(A B C\) as shown in the diagram. The work done by the system per cycle is

22Heat And Thermodynamics

One mole of \(\mathrm{O}_2\) gas is heated at constant pressure starting at \(27^{\circ} \mathrm{C}\). How much energy must be added to the gas as to double its volume?

23Heat And Thermodynamics

A Carnot engine takes 300 calories of heat from a source at 500 K and rejects 150 calories of heat to the sink. The temperature of the sink is

24Heat And Thermodynamics

A cup of tea cools from $65.5^{\circ} \mathrm{C}$ to $62.5^{\circ} \mathrm{C}$ in 1 min in a room at $22.5^{\circ} \mathrm{C}$. How long will it take to cool from $46.5^{\circ} \mathrm{C}$ to $40.5^{\circ} \mathrm{C}$ in the same room?

25Heat And Thermodynamics

Pressure of an ideal gas is increased by keeping temperature constant. The kinetic energy of molecules

26Heat And Thermodynamics

For which combination of working temperatures, the efficiency of Carnot's engine is the least?

27Heat And Thermodynamics

The S.I. unit of specific heat capacity is

28Heat And Thermodynamics

The mean energy of a molecule of an ideal gas is