Heat and Thermodynamics PYQs - Last 5 Years

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Practice 50 COMEDK 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 5 Years Heat and Thermodynamics Questions

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1Heat And Thermodynamics

An ideal gas has molar specific heat $\frac{5 R}{2}$ at constant pressure. If 1662 J of heat brings about 50 K temperature change, the number of moles of gas is

2Heat And Thermodynamics

Two bodies of specific heats $C_1$ and $C_2$, having the same heat capacities are combined to form a single composite body. The specific heat capacity of the composite body is

3Heat And Thermodynamics

Two vessels A and B contain same mass of Oxygen and Hydrogen respectively at the same temperature. The volume of $B$ is twice that of $A$. The ratio of gas pressure in $A$ to that in $B$ is

4Heat And Thermodynamics

1 kg of water at $100^{\circ} \mathrm{C}$ is converted to steam at the same temperature. Volume of 1 cc of water changes to $1671 \times 10^3 \mathrm{cc}$ on boiling. The change in internal energy of the system is (Latent Heat of vaporisati...

5Heat And Thermodynamics

Following graph shows four different processes, adiabatic, isothermal, isobaric and isochoric for an ideal gas, from the same initial state. Study the graph carefully and state which of the following statements is correct?

6Heat And Thermodynamics

A block of a certain material is heated to a temperature of $500^{\circ} \mathrm{C}$ and then placed on a large ice block. If 1.455 kg of ice melts, find the mass of the block.
Specific heat of the material is $0.39 \mathrm{Jg}^{-1} \mathrm...

7Heat And Thermodynamics

Find the mass of oxygen gas with which $1.882 \times 10^{23}$ degrees of freedom are associated at N.T.P. Given: Molar mass of diatomic gas, oxygen is $32 \mathrm{~g} \mathrm{~mol}^{-1}$ and oxygen molecule possess three translational and t...

8Heat And Thermodynamics

A vessel of volume $27 \times 10^4 \mathrm{cc}$, contains a mixture of Hydrogen (molar mass $=2 \mathrm{~g} \mathrm{~mol}^{-1}$ ) and oxygen (molar mass $=32 \mathrm{~g} \mathrm{~mol}^{-1}$ ) gas at standard temperature and pressure. If the...

9Heat And Thermodynamics

A sample of an ideal gas is taken through the cyclic process ABCA as shown in figure below. It absorbs 60 J of heat during the part AB and rejects 80 J of heat during CA . There is no heat exchanged during the process $\mathrm{BC} . \mathrm...

10Heat And Thermodynamics

The ratio of specific heat capacities at constant pressure to that at constant volume for a given mass of a gas is $\frac{5}{2}$. If the percentage increase in volume of the gas while undergoing an adiabatic change is $\frac{3}{2}$, then th...

11Heat And Thermodynamics

The mean energy per molecule for a diatomic gas is:

12Heat And Thermodynamics

A block of metal A is connected in series with another block of metal B such that the two metal blocks have the same area of cross sections. The thermal conductivity of metal A is K and the free end of metal A is at $80^{\circ} \mathrm{C}$....

13Heat And Thermodynamics

A given volume of gas at NTP is allowed to expand 6 times of its original volume, first under isothermal condition and then under adiabatic condition. Which of the given statement is correct? [Given $\frac{c_p}{c_v}=\gamma=1.4$ ]

14Heat And Thermodynamics

The rms velocity of the gas molecule at $327^{\circ} \mathrm{C}$ is same as the rms velocity of the oxygen molecules at $27^{\circ} \mathrm{C}$. If the molecular weight of oxygen is 32 then the molecular weight of the given gas molecule is:

15Heat And Thermodynamics

The total number of degrees of freedom associated with $2 \mathrm{~cm}^3$ of Nitrogen gas at normal temperature and pressure is:
[Given Avogadro number as ' N ' ]

16Heat And Thermodynamics

The rate of heat conduction in the given two metal rods having the same length is found to be the same when the temperature difference between the ends is kept $30^{\circ} \mathrm{C}$ If the area of cross section of the first rod is $8 \tim...

17Heat And Thermodynamics

A monoatomic ideal gas, initially at temperature $T_1$, is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature $\mathrm{T}_2$ by releasing the piston suddenly. If $L$ and $2 ...

18Heat And Thermodynamics

An ideal gas is expanding such that $P T^2=$ constant. The coefficient of volume expansion of the gas is

19Heat And Thermodynamics

Rods $A$ and $B$ have their lengths in the ratio $1: 2$. Their thermal conductivities are $K_1$ and $K_2$ respectively. The temperatures at the ends of each rod are $\mathrm{T}_1$ and $\mathrm{T}_2$. If the rate of flow of heat through the ...

20Heat And Thermodynamics

The heat required to increase the temperature of 4 moles of a mono-atomic ideal gas from $273^{\circ} \mathrm{C}$ to $473^{\circ} \mathrm{C}$ at constant volume is

21Heat And Thermodynamics

A cubical box of side \(1 \mathrm{~m}\) contains Boron gas at a pressure of \(100 \mathrm{~Nm}^{-2}\). During an observation time of 1 second, an atom travelling with the rms speed parallel to one of the edges of the cube, was found to make...

22Heat And Thermodynamics

An electric bulb of volume \(300 \mathrm{~cm}^3\) was sealed off during manufacture at a pressure of \(1 \mathrm{~mm}\) of mercury at \(27{ }^{\circ} \mathrm{C}\). The number of air molecules contained in the bulb is, $$(\mathrm{R}=8.31 \ma...

23Heat And Thermodynamics

A one $\mathrm{kg}$ block of ice at \(-1.5^{\circ} \mathrm{C}\) falls from a height of \(1.5 \mathrm{~km}\) and is found melting. The amount of ice melted due to fall, if \(60 \%\) energy is converted into heat is (Specific heat capacity of...

24Heat And Thermodynamics

A glass of hot water cools from \(90^{\circ} \mathrm{C}\) to \(70^{\circ} \mathrm{C}\) in 3 minutes when the temperature of surroundings is \(20^{\circ} \mathrm{C}\). What is the time taken by the glass of hot water to cool from $$60^{\circ...

25Heat And Thermodynamics

A cylinder of fixed capacity 44.81 contains hydrogen gas at STP. What is the amount of heat needed to raise the temperature of the gas in the cylinder by \(20^{\circ} \mathrm{C}\) ? ($$R=8.31 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$...

26Heat And Thermodynamics

Internal energy of \(\mathrm{n}_1\) moles of hydrogen at temperature T is equal to internal energy of \(\mathrm{m}_2\) moles of helium at temperature 2T. The ratio \(\frac{n_1}{n_2}\) is

27Heat And Thermodynamics

The latent heat of vaporisation of water is \(2240 \mathrm{~J}\). If the work done in the process of vaporisation of \(1 \mathrm{~g}\) is \(168 \mathrm{~J}\), the increase in internal energy is

28Heat And Thermodynamics

The coefficient of volume expansion of glycerine is \(49 \times 10^{-5} \mathrm{~K}^{-1}\). The percentage change in its density for a \(50^{\circ} \mathrm{C}\) rise in temperature is

29Heat And Thermodynamics

An ideal gas changes its state from \(\mathrm{A}\) to \(\mathrm{C}\) in two different paths \(\mathrm{ABC}\) and \(\mathrm{AC}\). The internal energy of the gas at state \(\mathrm{C}\) is \(20 \mathrm{~J}\) and at state \(\mathrm{B}\) is $$...

30Heat And Thermodynamics

If pressure of an ideal gas is increased by keeping temperature constant the kinetic energy will

31Heat And Thermodynamics

A cubical box of side \(2 \mathrm{~m}\) contains helium gas. It was observed that in a time of 1 second, an atom travelling with the root-mean-square speed parallel to one of the edges of the cube, made 250 hits with one of the walls, witho...

32Heat And Thermodynamics

An iron piece of mass \(200 \mathrm{~g}\) is kept inside a furnace for some time and then put in a calorimeter of water equivalent \(20 \mathrm{~g}\) containing \(230 \mathrm{~g}\) of water at \(20 \mathrm{C}\). The steady state temperature...

33Heat And Thermodynamics

Two black bodies \(\mathrm{P}\) and \(\mathrm{Q}\) have equal surface areas and are kept at temperatures \(127^{\circ} \mathrm{C}\) and \(27^{\circ} \mathrm{C}\) respectively. The ratio of thermal power radiated by A to that by B is

34Heat And Thermodynamics

The molecules of a given mass of a gas have root mean square speed of \(120 \mathrm{~m} / \mathrm{s}\) at \(88^{\circ} \mathrm{C}\) and 1 atmospheric pressure. The root mean square speed of the molecules at \(127^{\circ} \mathrm{C}\) and 2 ...

35Heat And Thermodynamics

If the ratio of specific heat of a gas at constant pressure to that at constant volume is \(\gamma\), the change in internal energy of a mass of a gas when the volume changes from \(\mathrm{V}\) to \(3 \mathrm{~V}\) at constant pressure is

36Heat And Thermodynamics

In an adiabatic expansion of air, the volume is increased by \(6.2 \%\). The percentage change in pressure is \((\gamma=1.4)\)

37Heat And Thermodynamics

A cylinder of radius \(r\) and of thermal conductivity \(K_1\) is surrounded by a cylindrical shell of inner radius \(r\) and outer radius \(2 r\) made of a material of thermal conductivity \(K_2\). The effective thermal conductivity of the...

38Heat And Thermodynamics

Two slabs are of the thicknesses \(d_1\) and \(d_2\). Their thermal conductivities are \(K_1\) and \(K_2\), respectively. They are in series. The free ends of the combination of these two slabs are kept at temperatures \(\theta_1\) and $$\t...

39Heat And Thermodynamics

If \(150 \mathrm{~J}\) of heat is added to a system and the work done by the system is \(110 \mathrm{~J}\), then change in internal energy will be

40Heat And Thermodynamics

An ideal gas goes from state \(A\) to state \(B\) via three different processes as indicated in the \(p\)-\(V\) diagram. If \(Q_1, Q_2\) and \(Q_3\) indicate the heat absorbed by the three processes and \(\Delta U_1, \Delta U_2\) and $$\Del...

41Heat And Thermodynamics

The gases carbon monoxide \((\mathrm{CO})\) and nitrogen at the same temperature have kinetic energies \(E_1\) and \(E_2\), respectively. Then,

42Heat And Thermodynamics

A gas is taken through the cycle \(A \rightarrow B \rightarrow C \rightarrow A\), as shown in figure. What is the net work done by the gas?

43Heat And Thermodynamics

The mean energy per molecule for a diatomic gas is

44Heat And Thermodynamics

Consider a compound slab consisting of two different materials having equal lengths, thickness and thermal conductivities K and 2K respectively. The equivalent thermal conductivity of the slab is

45Heat And Thermodynamics

In which mode of transmission, the heat waves travel along straight line with the speed of light?

46Heat And Thermodynamics

There are two identical containers C\(_1\) and C\(_2\) containing to identical gases. Gas in C\(_1\) is reduced to half of its original volume adiabatically, while the gas in container C\(_2\) is also reduced to half of its initial volume i...

47Heat And Thermodynamics

The average kinetic energy of a molecule in air at room temperature of 20\(^\circ\)C

48Heat And Thermodynamics

An ideal gas is taken through the cycle A \(\to\) B \(\to\) C \(\to\) A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process
C \(\to\) A is,

49Heat And Thermodynamics

From the following p-V diagram, an ideal gas undergoing a change of state from A to B. Four different processes I, II, III and IV as shown in the figure may lead to same change of state.

50Heat And Thermodynamics

If heat engine is filled at temperature 27\(^\circ\)C and heat of 100 k cal is taken from source at temperature 677\(^\circ\)C. Work done (in J) is