Heat and Thermodynamics PYQs - Last 10 Years

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Practice 425 MHT CET 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 50 of 425 filtered questions.

1Heat And Thermodynamics

The temperature gradient in a rod of length \(75 \mathrm{~cm}\) is \(40^{\circ} \mathrm{C} / \mathrm{m}\). If the temperature of cooler end of the rod is \(10^{\circ} \mathrm{C}\), then the temperature of hotter end is

2Heat And Thermodynamics

For an ideal gas the density of the gas is \(\rho_0\) when temperature and pressure of the gas are \(T_0\) and \(P_0\) respectively. When the temperature of the gas is \(2 \mathrm{~T}_0\), its pressure will be \(3 \mathrm{P}_0\). The new de...

3Heat And Thermodynamics

A Carnot engine has the same efficiency between (i) \(100 \mathrm{~K}\) and \(600 \mathrm{~K}\) and (ii) \(\mathrm{T} \mathrm{K}\) and \(960 \mathrm{~K}\). The temperature \(\mathrm{T}\) in kelvin of the sink is

4Heat And Thermodynamics

A black body at temperature \(127^{\circ} \mathrm{C}\) radiates heat at the rate of \(5 \mathrm{~cal} / \mathrm{cm}^2 \mathrm{~s}\). At a temperature \(927^{\circ} \mathrm{C}\), its rate of emission in units of $$\mathrm{cal} / \mathrm{cm}^...

5Heat And Thermodynamics

\(\mathrm{dQ}\) is the heat energy supplied to an ideal gas under isochoric conditions. If \(\mathrm{dU}\) and \(\mathrm{dW}\) denote the change in internal energy and the work done respectively then

6Heat And Thermodynamics

Which one of the following represents correctly the variation of volume (V) of an ideal gas with temperature \((\mathrm{T})\) under constant pressure conditions?

7Heat And Thermodynamics

A carnot engine operates with source at \(227^{\circ} \mathrm{C}\) and sink at \(27^{\circ} \mathrm{C}\). If the source supplies \(50 \mathrm{~kJ}\) of heat energy, the work done by the engine is

8Heat And Thermodynamics

Which one of the following is based on convection?

9Heat And Thermodynamics

For an adiabatic process, which one of the following is wrong statement?

10Heat And Thermodynamics

A gas at pressure \(p_0\) is contained in a vessel. If the masses of all the molecules are halved and their velocities are doubled, then the resulting pressure would be equal to

11Heat And Thermodynamics

The internal energy of a monoatomic ideal gas molecule is

12Heat And Thermodynamics

A sample of oxygen gas and a sample of hydrogen gas both have the same mass, same volume and the same pressure. The ratio of their absolute temperature is

13Heat And Thermodynamics

About black body radiation, which of the following is the wrong statement?

14Heat And Thermodynamics

A gas at normal temperature is suddenly compressed to one-fourth of its original volume. If \(\frac{\mathrm{C}_{\mathrm{p}}}{\mathrm{C}_{\mathrm{v}}}=\gamma=1.5\), then the increase in its temperature is

15Heat And Thermodynamics

A black sphere has radius '\(R\)' whose rate of radiation is '\(E\)' at temperature '\(T\)'. If radius is made \(R / 3\) and temperature '\(3 T\)', the rate of radiation will be

16Heat And Thermodynamics

A composite slab consists of two materials having coefficient of thermal conductivity \(\mathrm{K}\) and \(2 \mathrm{~K}\), thickness \(\mathrm{x}\) and \(4 \mathrm{x}\) respectively. The temperature of the two outer surfaces of a composite...

17Heat And Thermodynamics

The molar specific heat of an ideal gas at constant pressure and constant volume is \(\mathrm{C}_{\mathrm{p}}\) and \(\mathrm{C}_{\mathrm{v}}\) respectively. If \(\mathrm{R}\) is universal gas constant and $$\gamma=\frac{\mathrm{C}_{\mathrm...

18Heat And Thermodynamics

Let \(\gamma_1\) be the ratio of molar specific heat at constant pressure and molar specific heat at constant volume of a monoatomic gas and \(\gamma_2\) be the similar ratio of diatomic gas. Considering the diatomic gas molecule as a rigid...

19Heat And Thermodynamics

A monoatomic ideal gas initially at temperature '\(\mathrm{T}_1\)' is enclosed in a cylinder fitted with massless, frictionless piston. By releasing the piston suddenly the gas is allowed to expand to adiabatically to a temperature '$$\math...

20Heat And Thermodynamics

The volume of a metal block increases by \(0.225 \%\) when its temperature is increased by \(30^{\circ} \mathrm{C}\). Hence coefficient of linear expansion of the material of metal block is

21Heat And Thermodynamics

Compare the rate of loss of heat from a metal sphere at \(627^{\circ} \mathrm{C}\) with the rate of loss of heat from the same sphere at \(327^{\circ} \mathrm{C}\), if the temperature of the surrounding is \(27^{\circ} \mathrm{C}\). (nearly...

22Heat And Thermodynamics

Select the WRONG statement from the following. For an isothermal process

23Heat And Thermodynamics

For polyatomic gases, the ratio of molar specific heat at constant pressure to constant volume is ( \(\mathrm{f}=\) degrees of freedom)

24Heat And Thermodynamics

A black body radiates maximum energy at wavelength '\(\lambda\)' and its emissive power is '\(E\)'. Now due to a change in temperature of that body, it radiates maximum energy at wavelength \(\frac{\lambda}{3}\). At that temperature emissiv...

25Heat And Thermodynamics

If a gas is compressed isothermally then the r.m.s. velocity of the molecules

26Heat And Thermodynamics

A diatomic gas \(\left(\gamma=\frac{7}{5}\right)\) is compressed adiabatically to volume \(\frac{V_i}{32}\) where \(V_i\) is its initial volume. The initial temperature of the gas is \(T_i\) in Kelvin and the final temperature is '\(x T_i\)...

27Heat And Thermodynamics

A monoatomic gas at pressure '\(\mathrm{P}\)', having volume '\(\mathrm{V}\)' expands isothermally to a volume '\(2 \mathrm{~V}\)' and then adiabatically to a volume '\(16 \mathrm{~V}\)'. The final pressure of the gas is (Take $$\gamma=5 / ...

28Heat And Thermodynamics

If the temperature of a hot body is increased by \(50 \%\), then the increase in the quantity of emitted heat radiation will be approximately

29Heat And Thermodynamics

The rate of flow of heat through a metal rod with temperature difference \(40^{\circ} \mathrm{C}\) is \(1600 \mathrm{~cal} / \mathrm{s}\). The thermal resistance of metal rod in \({ }^{\circ} \mathrm{C} \mathrm{s} / \mathrm{cal}\) is

30Heat And Thermodynamics

Two spherical black bodies of radii '\(r_1\)' and '\(r_2\)' at temperature '\(\mathrm{T}_1\)' and '\(\mathrm{T}_2\)' respectively radiate power in the ratio \(1: 2\) Then \(r_1: r_2\) is

31Heat And Thermodynamics

An ideal gas expands adiabatically. \((\gamma=1 \cdot 5)\) To reduce the r.m.s. velocity of the molecules 3 times, the gas has to be expanded

32Heat And Thermodynamics

The difference in length between two rods \(\mathrm{A}\) and \(\mathrm{B}\) is \(60 \mathrm{~cm}\) at all temperatures. If \(\alpha_{\mathrm{A}}=18 \times 10^{-6} /{ }^{\circ} \mathrm{C}\) and $$\beta_{\mathrm{B}}=27 \times 10^{-6} /{ }^{\c...

33Heat And Thermodynamics

According to Boyle's law, the product PV remains constant. The unit of \(\mathrm{PV}\) is same as that of

34Heat And Thermodynamics

If temperature of gas molecules is raised from \(127^{\circ} \mathrm{C}\) to \(527^{\circ} \mathrm{C}\), the ratio of r.m.s. speed of the molecules is respectively

35Heat And Thermodynamics

Two bodies \(\mathrm{A}\) and \(\mathrm{B}\) at temperatures '\(\mathrm{T}_1\)' \(\mathrm{K}\) and '\(\mathrm{T}_2\)' \(\mathrm{K}\) respectively have the same dimensions. Their emissivities are in the ratio \(1: 3\). If they radiate the sa...

36Heat And Thermodynamics

For a gas, \(\frac{\mathrm{R}}{\mathrm{C}_{\mathrm{v}}}=0 \cdot 4\), where \(\mathrm{R}\) is universal gas constant and \(\mathrm{C}_{\mathrm{v}}\) is molar specific heat at constant volume. The gas is made up of molecules which are

37Heat And Thermodynamics

A sample of gas at temperature \(T\) is adiabatically expanded to double its volume. The work done by the gas in the process is \(\left(\frac{\mathrm{C}_{\mathrm{P}}}{\mathrm{C}_{\mathrm{V}}}=\gamma=\frac{3}{2}\right) \quad(\mathrm{R}=\) ga...

38Heat And Thermodynamics

Heat energy is incident on the surface at the rate of X J/min . If '\(a\)' and '\(r\)' represent coefficient of absorption and reflection respectively then the heat energy transmitted by the surface in '\(t\)' minutes is

39Heat And Thermodynamics

A piece of metal at \(850 \mathrm{~K}\) is dropped in to \(1 \mathrm{~kg}\) water at \(300 \mathrm{~K}\). If the equilibrium temperature of water is \(350 \mathrm{~K}\) then the heat capacity of the metal, expressed in \(\mathrm{JK}^{-1}\) ...

40Heat And Thermodynamics

A Carnot engine with efficiency \(50 \%\) takes heat from a source at \(600 \mathrm{~K}\). To increase the efficiency to \(70 \%\), keeping the temperature of the sink same, the new temperature of the source will be

41Heat And Thermodynamics

A black body radiates maximum energy at wavelength '\(\lambda\)' and its emissive power is \(\mathrm{E}\). Now due to change in temperature of that body, it radiates maximum energy at wavelength \(\frac{2 \lambda}{3}\). At that temperature ...

42Heat And Thermodynamics

The average force applied on the walls of a closed container depends on \(T^x\) where \(T\) is the temperature of an ideal gas. The value of '\(x\)' is

43Heat And Thermodynamics

In a vessel, the ideal gas is at a pressure \(\mathrm{P}\). If the mass of all the molecules is halved and their speed is doubled, then resultant pressure of the gas will be

44Heat And Thermodynamics

An insulated container contains a monoatomic gas of molar mass '\(\mathrm{m}\)'. The container is moving with velocity '\(\mathrm{V}\)'. If it is stopped suddenly, the change in temperature of a gas is [R is gas constant]

45Heat And Thermodynamics

We have a jar filled with gas characterized by parameters \(\mathrm{P}, \mathrm{V}, \mathrm{T}\) and another jar B filled with gas having parameters \(2 \mathrm{P}, \frac{\mathrm{V}}{4}, 2 \mathrm{~T}\), where symbols have their usual meani...

46Heat And Thermodynamics

A metal rod \(2 \mathrm{~m}\) long increases in length by \(1.6 \mathrm{~mm}\), when heated from \(0^{\circ} \mathrm{C}\) to \(60^{\circ} \mathrm{C}\). The coefficient of linear expansion of metal rod is

47Heat And Thermodynamics

Which of the following graphs between pressure (P) and volume (V) correctly shows isochoric changes?

48Heat And Thermodynamics

A black body radiates maximum energy at wavelength '\(\lambda\)' and its emissive power is 'E' Now due to change in temperature of that body, it radiates maximum energy at wavelength \(\frac{2 \lambda}{3}\). At that temperature emissive pow...

49Heat And Thermodynamics

The thermodynamic process in which no work is done on or by the gas is

50Heat And Thermodynamics

Two monatomic ideal gases A and B of molecular masses '\(m_1\)' and '\(m_2\)' respectively are enclosed in separate containers kept at the same temperature. The ratio of the speed of sound in gas A to that in gas B is given by