# Heat and Thermodynamics · Physics · MHT CET

Start Practice## MCQ (Single Correct Answer)

MHT CET 2023 14th May Evening Shift

A metal rod cools at the rate of $$4{ }^{\circ} \mathrm{C} / \mathrm{min}$$ whon its temperature is $$90^{\circ} \mathrm{C}$$ and the rate of $$1{ }^{...

MHT CET 2023 14th May Evening Shift

The molecular mass of a gas having r.m.s. speed four times as that of another gas having molecular mass 32 is

MHT CET 2023 14th May Evening Shift

At constant temperature, increasing the pressure of a gas by $$5 \%$$ its volume will decrease by

MHT CET 2023 14th May Evening Shift

The temperature of a gas is measure of

MHT CET 2023 14th May Evening Shift

An ideal refrigerator has freezer at a temperature of $$-13^{\circ} \mathrm{C}$$. The coefficient of performance of the engine is 5. The temperature o...

MHT CET 2023 14th May Evening Shift

The pressure and density of a diatomic gas $$\left(\gamma=\frac{7}{5}\right)$$ changes adiabatically from $$(\mathrm{P}, \rho)$$ to $$\left(\mathrm{P}...

MHT CET 2023 14th May Morning Shift

A sphere and a cube, both of copper have equal volumes and are black. They are allowed to cool at same temperature and in same atmosphere. The ratio o...

MHT CET 2023 14th May Morning Shift

A body is said to be opaque to the radiation if (a, r and t are coefficient of absorption, reflection and transmission respectively)

MHT CET 2023 14th May Morning Shift

In a thermodynamic system, $$\Delta U$$ represents the increases in its internal energy and dW is the work done by the system then correct statement o...

MHT CET 2023 14th May Morning Shift

The temperature of a gas is $$-68^{\circ} \mathrm{C}$$. To what temperature should it be heated, so that the r.m.s. velocity of the molecules be doubl...

MHT CET 2023 14th May Morning Shift

A sphere, a cube and a thin circular plate all made of same material and having the same mass are heated to same temperature of $$200^{\circ} \mathrm{...

MHT CET 2023 14th May Morning Shift

The efficiency of a heat engine is '$$\eta$$' and the coefficient of performance of a refrigerator is '$$\beta$$'. Then

MHT CET 2023 13th May Evening Shift

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 temperatur...

MHT CET 2023 13th May Evening Shift

The internal energy of a monoatomic ideal gas molecule is

MHT CET 2023 13th May Evening Shift

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...

MHT CET 2023 13th May Evening Shift

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

MHT CET 2023 13th May Evening Shift

Which one of the following is based on convection?

MHT CET 2023 13th May Evening Shift

A carnot engine operates with source at $$227^{\circ} \mathrm{C}$$ and sink at $$27^{\circ} \mathrm{C}$$. If the source supplies $$50 \mathrm{~kJ}$$ o...

MHT CET 2023 13th May Morning Shift

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

MHT CET 2023 13th May Morning Shift

$$\mathrm{dQ}$$ is the heat energy supplied to an ideal gas under isochoric conditions. If $$\mathrm{dU}$$ and $$\mathrm{dW}$$ denote the change in in...

MHT CET 2023 13th May Morning Shift

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 ...

MHT CET 2023 13th May Morning Shift

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{~...

MHT CET 2023 13th May Morning Shift

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 temperat...

MHT CET 2023 13th May Morning Shift

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...

MHT CET 2023 12th May Evening Shift

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, i...

MHT CET 2023 12th May Evening Shift

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

MHT CET 2023 12th May Evening Shift

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

MHT CET 2023 12th May Evening Shift

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}...

MHT CET 2023 12th May Evening Shift

The volume of a metal block increases by $$0.225 \%$$ when its temperature is increased by $$30^{\circ} \mathrm{C}$$. Hence coefficient of linear expa...

MHT CET 2023 12th May Evening Shift

A monoatomic ideal gas initially at temperature '$$\mathrm{T}_1$$' is enclosed in a cylinder fitted with massless, frictionless piston. By releasing t...

MHT CET 2023 12th May Morning Shift

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_...

MHT CET 2023 12th May Morning Shift

The molar specific heat of an ideal gas at constant pressure and constant volume is $$\mathrm{C}_{\mathrm{p}}$$ and $$\mathrm{C}_{\mathrm{v}}$$ respec...

MHT CET 2023 12th May Morning Shift

A composite slab consists of two materials having coefficient of thermal conductivity $$\mathrm{K}$$ and $$2 \mathrm{~K}$$, thickness $$\mathrm{x}$$ a...

MHT CET 2023 12th May Morning Shift

A black sphere has radius '$$R$$' whose rate of radiation is '$$E$$' at temperature '$$T$$'. If radius is made $$R / 3$$ and temperature '$$3 T$$', th...

MHT CET 2023 12th May Morning Shift

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}}}=...

MHT CET 2023 12th May Morning Shift

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

MHT CET 2023 11th May Evening Shift

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...

MHT CET 2023 11th May Evening Shift

Two bodies $$\mathrm{A}$$ and $$\mathrm{B}$$ at temperatures '$$\mathrm{T}_1$$' $$\mathrm{K}$$ and '$$\mathrm{T}_2$$' $$\mathrm{K}$$ respectively have...

MHT CET 2023 11th May Evening Shift

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...

MHT CET 2023 11th May Evening Shift

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

MHT CET 2023 11th May Evening Shift

The difference in length between two rods $$\mathrm{A}$$ and $$\mathrm{B}$$ is $$60 \mathrm{~cm}$$ at all temperatures. If $$\alpha_{\mathrm{A}}=18 \t...

MHT CET 2023 11th May Evening Shift

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

MHT CET 2023 11th May Morning Shift

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...

MHT CET 2023 11th May Morning Shift

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...

MHT CET 2023 11th May Morning Shift

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

MHT CET 2023 11th May Morning Shift

A monoatomic gas at pressure '$$\mathrm{P}$$', having volume '$$\mathrm{V}$$' expands isothermally to a volume '$$2 \mathrm{~V}$$' and then adiabatica...

MHT CET 2023 11th May Morning Shift

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 i...

MHT CET 2023 11th May Morning Shift

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

MHT CET 2023 10th May Evening Shift

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 radia...

MHT CET 2023 10th May Evening Shift

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

MHT CET 2023 10th May Evening Shift

A metal rod $$2 \mathrm{~m}$$ long increases in length by $$1.6 \mathrm{~mm}$$, when heated from $$0^{\circ} \mathrm{C}$$ to $$60^{\circ} \mathrm{C}$$...

MHT CET 2023 10th May Evening Shift

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 $...

MHT CET 2023 10th May Evening Shift

An insulated container contains a monoatomic gas of molar mass '$$\mathrm{m}$$'. The container is moving with velocity '$$\mathrm{V}$$'. If it is stop...

MHT CET 2023 10th May Evening Shift

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 pres...

MHT CET 2023 10th May Morning Shift

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 '$$x$$' i...

MHT CET 2023 10th May Morning Shift

A black body radiates maximum energy at wavelength '$$\lambda$$' and its emissive power is $$\mathrm{E}$$. Now due to change in temperature of that bo...

MHT CET 2023 10th May Morning Shift

A Carnot engine with efficiency $$50 \%$$ takes heat from a source at $$600 \mathrm{~K}$$. To increase the efficiency to $$70 \%$$, keeping the temper...

MHT CET 2023 10th May Morning Shift

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 $...

MHT CET 2023 10th May Morning Shift

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...

MHT CET 2023 10th May Morning Shift

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{...

MHT CET 2023 9th May Evening Shift

An ideal gas in a container of volume 500 c.c. is at a pressure of $$2 \times 10^{+5} \mathrm{~N} / \mathrm{m}^2$$. The average kinetic energy of each...

MHT CET 2023 9th May Evening Shift

A gas at N.T.P. is suddenly compressed to onefourth of its original volume. If $$\gamma=1.5$$, then the final pressure is

MHT CET 2023 9th May Evening Shift

A gas is compressed at a constant pressure of $$50 \mathrm{~N} / \mathrm{m}^2$$ from a volume of $$10 \mathrm{~m}^3$$ to a volume of $$4 \mathrm{~m}^3...

MHT CET 2023 9th May Evening Shift

The pressure exerted by an ideal gas at a particular temperature is directly proportional to

MHT CET 2023 9th May Evening Shift

The side of a copper cube is $$1 \mathrm{~m}$$ at $$0^{\circ} \mathrm{C}$$. What will be the change in its volume, when it is heated to $$100^{\circ} ...

MHT CET 2023 9th May Evening Shift

The temperature of an ideal gas is increased from $$27^{\circ} \mathrm{C}$$ to $$927^{\circ} \mathrm{C}$$. The r.m.s. speed of its molecules becomes...

MHT CET 2023 9th May Morning Shift

A jar '$$\mathrm{P}$$' is filled with gas having pressure, volume and temperature $$\mathrm{P}, \mathrm{V}, \mathrm{T}$$ respectively. Another gas jar...

MHT CET 2023 9th May Morning Shift

For a gas having '$$\mathrm{X}$$' degrees of freedom, '$$\gamma$$' is ($$\gamma=$$ ratio of specific heats $$=\mathrm{C_P / C_V}$$)

MHT CET 2023 9th May Morning Shift

Two uniform brass rods $$A$$ and $$B$$ of length '$$l$$' and '$$2 l$$' and their radii '$$2 r$$' and '$$r$$' respectively are heated to same temperatu...

MHT CET 2023 9th May Morning Shift

A gas at N.T.P. is suddenly compressed to $$\left(\frac{1}{4}\right)^{\text {th }}$$ of its original volume. The final pressure in (Given $$\gamma=$$ ...

MHT CET 2023 9th May Morning Shift

In a thermodynamic process, there is no exchange of heat between the system and surroundings. Then the thermodynamic process is

MHT CET 2023 9th May Morning Shift

According to kinetic theory of gases, which one of the following statements is wrong?

MHT CET 2022 11th August Evening Shift

Three discs $$\mathrm{x}, \mathrm{y}$$ and $$\mathrm{z}$$ having radii $$2 \mathrm{~m}, 3 \mathrm{~m}$$ and $$6 \mathrm{~m}$$ respectively are coated ...

MHT CET 2022 11th August Evening Shift

When the rms velocity of a gas is denoted by '$$v$$', which one of the following relations is true?
($$\mathrm{T}=$$ Absolute temperature of the gas.)...

MHT CET 2022 11th August Evening Shift

A monoatomic gas $$\left(\gamma=\frac{5}{3}\right)$$ initially at $$27^{\circ} \mathrm{C}$$ having volume '$$\mathrm{V}$$' is suddenly compressed to o...

MHT CET 2022 11th August Evening Shift

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 temper...

MHT CET 2022 11th August Evening Shift

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

MHT CET 2022 11th August Evening Shift

Heat given to a body, which raises its temperature by 1ºC is known as

MHT CET 2021 24th September Evening Shift

Which one of the following is NOT a correct expression for an ideal gas?
[$$\mathrm{C_p}=$$ Molar specific heat of a gas at constant pressure,
$$\math...

MHT CET 2021 24th September Evening Shift

The molecular masses of helium and oxygen are 4 and 32 respectively. The ratio of r.m.s. speed of helium at 327$$^\circ$$ to r.m.s. speed of oxygen at...

MHT CET 2021 24th September Evening Shift

Which one of the following p-V diagram is correct for an isochoric process:
...

MHT CET 2021 24th September Evening Shift

Assume that for solar radiation, surface temperature of the sun is $$6000 \mathrm{~K}$$. If Wien's constant 'b' is $$2.897 \times 10^{-3} \mathrm{~mK}...

MHT CET 2021 24th September Evening Shift

A metal sphere cools at the rate of $$1.5^{\circ} \mathrm{C} / \mathrm{min}$$ when its temperature is $$80^{\circ} \mathrm{C}$$. At what rate will it ...

MHT CET 2021 24th September Evening Shift

A monoatomic gas is suddenly compressed to $$(1 / 8)^{\text {th }}$$ of its initial volume adiabatically. The ratio of the final pressure to initial p...

MHT CET 2021 24th September Morning Shift

A monoatomic ideal gas initially at temperature $$\mathrm{T}_1$$ is enclosed in a cylinder fitted with 8 frictionless piston. The gas is allowed to ex...

MHT CET 2021 24th September Morning Shift

For a monoatomic gas, the work done at constant pressure is '$$\mathrm{W}$$' The heat supplied at constant volume for the same rise in temperature of ...

MHT CET 2021 24th September Morning Shift

An ideal gas with pressure $$\mathrm{P}$$, volume $$\mathrm{V}$$ and temperature $$\mathrm{T}$$ is expanded isothermally to a volume $$2 \mathrm{~V}$$...

MHT CET 2021 24th September Morning Shift

At what temperature does the average translational kinetic energy of a molecule in a gas becomes equal to kinetic energy of an electron accelerated fr...

MHT CET 2021 24th September Morning Shift

The temperature difference between two sides of an iron plate, $$1.8 \mathrm{~cm}$$ thick is $$9^{\circ} \mathrm{C}$$. Heat is transmitted through the...

MHT CET 2021 24th September Morning Shift

Internal energy of $$n_1$$ moles of hydrogen at temperature '$$T$$' is equal to internal energy of '$$n_2$$' moles of helium at temperature $$2 T$$, t...

MHT CET 2021 23rd September Evening Shift

For an ideal gas, $$R=\frac{2}{3} C_v$$. This suggests that the gas consists of molecules, which are [$$\mathrm{R}=$$ universal gas constant]

MHT CET 2021 23rd September Evening Shift

The rms speed of a gas molecule is '$$\mathrm{V}$$' at pressure '$$\mathrm{P}$$'. If the pressure is increased by two times, then the rms speed of the...

MHT CET 2021 23rd September Evening Shift

Equal volumes of two gases, having their densíties in the ratio of $$1: 16$$ exert equal pressures on the walls of two containers. The ratio of their ...

MHT CET 2021 23rd September Evening Shift

A cylindrical rod has temperatures '$$T_1$$' and '$$T_2$$' at its ends. The rate of flow of heat is '$$Q_1$$' cal $$\mathrm{s}^{-1}$$. If length and r...

MHT CET 2021 23rd September Evening Shift

The initial pressure and volume of a gas is '$$\mathrm{P}$$' and '$$\mathrm{V}$$' respectively. First by isothermal process gas is expanded to volume ...

MHT CET 2021 23th September Morning Shift

If $$\mathrm{m}$$' represents the mass of each molecules of a gas and $$\mathrm{T}$$' its absolute temperature then the root mean square speed of the ...

MHT CET 2021 23th September Morning Shift

An ideal gas at pressure '$$p$$' is adiabatically compressed so that its density becomes twice that of the initial. If $$\gamma=\frac{c_p}{c_v}=\frac{...

MHT CET 2021 23th September Morning Shift

Which one of the following statements is wrong for an isobaric process?

MHT CET 2021 23th September Morning Shift

For a perfectly black body, coefficient of emission is

MHT CET 2021 23th September Morning Shift

Two rods of different metals have coefficients of linear expansion '$$\alpha_1$$' and '$$\alpha_2$$' respectvely. Their respective lengths are '$$\mat...

MHT CET 2021 23th September Morning Shift

The temperature of a black body is increased by $$50 \%$$, then the percentage increase in the rate of radiation by the body is approximated

MHT CET 2021 22th September Evening Shift

The emissive power of sphere of area $$0.04 \mathrm{~m}^2$$ is $$0.7 \mathrm{~k} \mathrm{~cal} \mathrm{~s}^{-1} \mathrm{~m}^{-2}$$. The amount of heat...

MHT CET 2021 22th September Evening Shift

The rate of flow of heat through a copper rod with temperature difference $$28^{\circ} \mathrm{C}$$ is $$1400 \mathrm{~cal} \mathrm{~s}^{-1}$$. The th...

MHT CET 2021 22th September Evening Shift

The change in internal energy of the mass of a gas, when the volume changes from '$$\mathrm{V}$$' to '$$2 \mathrm{~V}$$' at constant pressure 'P' is (...

MHT CET 2021 22th September Evening Shift

If the pressure of an ideal gas is decreased by $$10 \%$$ isothermally, then its volume will

MHT CET 2021 22th September Evening Shift

An ideal gas having molar mass '$$\mathrm{M}_0$$', has r.m.s. velocity 'V' at temperature 'T'. Then

MHT CET 2021 22th September Evening Shift

An ideal gas at $$27^{\circ} \mathrm{C}$$ is compressed adiabatically to $$(8 / 27)$$ of its original volume. If ratio of specific heats, $$\gamma=5 /...

MHT CET 2021 22th September Morning Shift

The translational kinetic energy of the molecules of a gas at absolute temperature (T) can be doubled

MHT CET 2021 22th September Morning Shift

A polyatomic gas $$(\gamma=4 / 3)$$ is compressed to $$\left(\frac{1}{8}\right)^{\text {th }}$$ of its volume adiabatically. If its initial pressure i...

MHT CET 2021 22th September Morning Shift

If the temperature of the sun is doubled, the rate of energy received by the earth will be increased by a factor

MHT CET 2021 22th September Morning Shift

Which of the following statements is true?
($$\Delta \mathrm{U}=$$ increase in internal energy, $$\mathrm{dW}=$$ work done by the system)...

MHT CET 2021 22th September Morning Shift

Let '$$\mathrm{W}_1$$' be the work done in blowing a soap bubble of radius '$$r$$' from soap solution at room temperature. The soap solution is now he...

MHT CET 2021 22th September Morning Shift

A cylindrical rod is having temperatures $$\theta_1$$ and $$\theta_2$$ at its ends. The rate of heat flow is '$$Q$$' $$\mathrm{J}{\mathrm{s}}^{-1}$$. ...

MHT CET 2021 22th September Morning Shift

For a gas molecule with 6 degrees of freedom, which one of the following relation between gas constant '$$\mathrm{R}$$' and molar specific heat '$$\ma...

MHT CET 2021 21th September Evening Shift

What is the ratio of the velocity of sound in hydrogen $$\left(\gamma=\frac{7}{5}\right)$$ to that in helium $$\left(\gamma=\frac{5}{3}\right)$$ at th...

MHT CET 2021 21th September Evening Shift

Equal volumes of two gases are kept in different containers having densities in the ratio 1 : 16. They exert equal pressures on the wall of their resp...

MHT CET 2021 21th September Evening Shift

In thermodynamics, for an isochoric process, which one of the following statement is INCORRECT?

MHT CET 2021 21th September Evening Shift

If '$$\mathrm{E}$$' is the kinetic energy per mole of an ideal gas and '$$\mathrm{T}$$' is the absolute temperature, then the universal gas constant i...

MHT CET 2021 21th September Evening Shift

Two rods of same length and material are joined end to end. They transfer heat in 8 second. When they are joined in parallel they transfer same amount...

MHT CET 2021 21th September Morning Shift

The molar specific heats of an ideal gas at constant pressure and volume are denoted by '$$\mathrm{C}_{\mathrm{p}}$$' and '$$C_v$$' respectively. If $...

MHT CET 2021 21th September Morning Shift

The temperature difference bewtween two sides of metal plate, $$3 \mathrm{~cm}$$ thick is $$15^{\circ} \mathrm{C}$$. Heat is transmitted through plate...

MHT CET 2021 21th September Morning Shift

A black body has maximum wavelength '$$\lambda_{\mathrm{m}}$$' at temperature $$2000 \mathrm{~K}$$. Its corresponding wavelength at temperature $$3000...

MHT CET 2021 21th September Morning Shift

A monoatomic gas at pressure '$$\mathrm{P}$$' having volume '$$\mathrm{V}$$' expands isothermally to a volume $$2 \mathrm{~V}$$ and then adiabatically...

MHT CET 2021 21th September Morning Shift

A black reactangular surface of area '$$a$$' emits energy '$$\mathrm{E}$$' per second at $$27^{\circ} \mathrm{C}$$. If length and breadth is reduced t...

MHT CET 2021 21th September Morning Shift

Find the value of $$-$$197$$^\circ$$C temperature in Kelvin.

MHT CET 2021 21th September Morning Shift

Which one of the following equations specifies an isobaric process? $$[Q=$$ heat supplied $$\Delta P, \Delta V$$ and $$\Delta T$$ are change in pressu...

MHT CET 2021 20th September Evening Shift

A perfect gas of volume 10 litre n compressed isothermally to a volume of 1 litre. The rms speed of the molecules will

MHT CET 2021 20th September Evening Shift

The relation obeyed by a perfect gas during an adiabatic process is $$\mathrm{PV}^{3 / 2}$$. The initial temperature of the gas is '$$\mathrm{T}$$'. W...

MHT CET 2021 20th September Evening Shift

A black rectangular surface of area '$$\mathrm{A}$$' emits energy '$$\mathrm{E}$$' per second at $$27^{\circ} \mathrm{C}$$. If length and breadth is r...

MHT CET 2021 20th September Evening Shift

A monoatomic gas is suddenly compressed to (1/8)th of its initial volume adiabatically. The ratio of the final pressure to initial pressure of the gas...

MHT CET 2021 20th September Evening Shift

A conducting rod of length $$1 \mathrm{~m}$$ has area of cross-section $$10^{-3} \mathrm{~m}^2$$. One end is immersed in baiting water $$\left(100^{\c...

MHT CET 2021 20th September Evening Shift

Two stars 'P' and 'Q' emit yellow and blue light respectively. The relation between their temperatures $$\left(\mathrm{T}_{\mathrm{P}}\right.$$ and $$...

MHT CET 2021 20th September Morning Shift

A perfectly black body emits a radiation at temperature 'T$$_1$$' K. If it is to radiate at 16 times this power, its temperature 'T$$_2$$' K should be...

MHT CET 2021 20th September Morning Shift

One mole of an ideal gas expands adiabatically at constant pressure such that its temperature $$T \propto {1 \over {\sqrt V }}$$. The value of $$\gamm...

MHT CET 2021 20th September Morning Shift

On an imaginary linear scale of temperature (called 'W' scale) the freezing and boiling points of water are 39$$^\circ$$ W and 239$$^\circ$$ W respect...

MHT CET 2021 20th September Morning Shift

Specific heats of an ideal gas at constant pressure and volume are denoted by $$\mathrm{C}_{\mathrm{p}}$$ and $$\mathrm{C}_{\mathrm{v}}$$ respectively...

MHT CET 2021 20th September Morning Shift

For a monoatomic gas, work done at constant pressure is W. The heat supplied at constant volume for the same rise in temperature of the gas is

MHT CET 2020 16th October Morning Shift

For a gas, $$\frac{R}{C_V}=0.4$$, where $$R$$ is universal gas constant and $$C_V$$ is the molar specific heat at constant volume. The gas is made up ...

MHT CET 2020 16th October Morning Shift

A monoatomic gas of pressure $$p$$ having volume $$V$$ expands isothermally to a volume $$2V$$ and then adiabatically to a volume $$16 \mathrm{~V}$$. ...