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MHT-CET Kinetic Theory of Gases and Radiation — practice questions

Explore 64 free Kinetic Theory of Gases and Radiation questions in MHT-CET Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Kinetic Theory of Gases and Radiation questions and exercises with answers

Showing questions 1–30 of 64.

At constant temperature, how does gas volume vary with pressure?Read the answer and worked solution →What name is given to the equation that relates the pressure, volume, temperature and internal energy of a gas?Read the answer and worked solution →In PV = nRT, a gas sample has mass M and molar mass M0. What is the number of moles n?Read the answer and worked solution →A gas that obeys the ideal gas equation at all pressures and temperatures is known as what?Read the answer and worked solution →Between two collisions, how does a gas molecule move?Read the answer and worked solution →When a gas is pumped out of an enclosure, what happens to the mean free path of its molecules?Read the answer and worked solution →Why is air removed when metal films are coated by evaporation?Read the answer and worked solution →Nitrogen molecules of diameter 324 pm at 273 K and 1 atm have a mean free path close to what value?Read the answer and worked solution →An elastic collision with a wall parallel to the yz-plane changes which velocity component of the molecule?Read the answer and worked solution →A molecule hits a wall of a cube of side L, then rebounds. What distance does it cover before hitting that wall again?Read the answer and worked solution →For N molecules of mass m in volume V, what is the kinetic theory expression for gas pressure?Read the answer and worked solution →At equal temperature, how many times faster is the rms speed of H2 (molar mass 2) than O2 (32)?Read the answer and worked solution →By what factor does the rms speed of a gas change when its absolute temperature is raised four times?Read the answer and worked solution →What is the largest possible value of the adiabatic ratio for a gas, attained by monatomic gases?Read the answer and worked solution →The distribution of molecular speeds of a gas at a given temperature is named after whom?Read the answer and worked solution →What is the rms speed of helium atoms (mass 4u) at 300 K, to the nearest 10 m/s?Read the answer and worked solution →Why is the internal energy of an ideal gas purely kinetic?Read the answer and worked solution →The average energy per molecule of an ideal gas is proportional to which quantity?Read the answer and worked solution →How many rotational degrees of freedom are counted for a rigid diatomic molecule such as O2?Read the answer and worked solution →Why is spin about the molecular axis not a rotational dof?Read the answer and worked solution →Each vibrational mode of a diatomic molecule contributes how much energy per molecule at temperature T?Read the answer and worked solution →Equipartition of energy fails in which temperature range?Read the answer and worked solution →Which relation connects the molar specific heats CP and CV of an ideal gas?Read the answer and worked solution →When an ideal gas is heated at constant volume, where does the heat go?Read the answer and worked solution →Why does heating at constant pressure need more heat than at constant volume?Read the answer and worked solution →Thermal radiation emitted by hot bodies consists of what?Read the answer and worked solution →How are a, r and tr of thermal radiation related?Read the answer and worked solution →What are the units of the coefficients of absorption, reflection and transmission?Read the answer and worked solution →Which of these substances is diathermanous, allowing heat radiation to pass through?Read the answer and worked solution →What is the coefficient of absorption of a perfect blackbody?Read the answer and worked solution →

Worked practice questions

At constant temperature, how does gas volume vary with pressure?

  1. Directly proportional
  2. Proportional to its square
  3. Independent of pressure
  4. Inversely proportional
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Correct answer: D. Inversely proportional

Boyle's law states that at fixed temperature the product of pressure and volume stays constant, so volume falls as pressure rises.

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What name is given to the equation that relates the pressure, volume, temperature and internal energy of a gas?

  1. Equation of continuity
  2. Equation of rotation
  3. Equation of state
  4. Equation of energy
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Correct answer: C. Equation of state

An equation connecting the quantities that specify the state of a gas is called its equation of state.

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In PV = nRT, a gas sample has mass M and molar mass M0. What is the number of moles n?

  1. M multiplied by M0
  2. M0 divided by M
  3. M plus M0 together
  4. M divided by M0
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Correct answer: D. M divided by M0

Number of moles is the mass of the sample divided by the mass of one mole, so n = M/M0.

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More Physics topics

ElectrostaticsCurrent ElectricityOscillationsElectromagnetic InductionKinetic Theory of GasesMechanical Properties of FluidsAtomsWave Optics