Physics

Thermodynamics and Gas Laws

616 Questions

Thermodynamics and gas laws questions test the understanding of ideal gas behavior, work done during thermodynamic processes, and specific heat ratios. Key areas include isothermal, adiabatic, and isobaric expansions along with real gas deviations. These mathematical physics concepts are standard in engineering and general science competitive exams.

Ideal gas equationIsothermal and adiabatic processesThermodynamic workGas kinetic theoryReal gas behavior

Thermodynamics and Gas Laws Questions

Multiple choice

Which of the following statements is/are correct?

a. The energy supplied to the particles during heating is used to overcome the forces of attraction. b. A gas is liquefied by applying high pressure and increasing the temperature. c. Gaseous state of ammonia at room temperature is an example of vapour.

  1. Only a

  2. Only b

  3. Only c

  4. Only a and c

  5. Only b and c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This statement is correct. Thus, this option is the correct answer.

Multiple choice

Which of the following statements is correct?

  1. Gases have no open surface.

  2. There is extreme attraction between gaseous particles.

  3. Inter-molecular force is maximum in gases.

  4. Gases can flow from higher levels to lower levels and are thus, called fluids.

  5. Gases have rigidity and compressibility.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is correct. Gases have no open surface. In gases, the inter-molecular forces of attraction are very weak. Hence, the particles move without any restriction in random motion. These thus, occupy any available space and move away if there is an open space. That is why gases do not have any open surface.

Multiple choice

Which of the following statements is/are false?

P. The use of hot air balloons in meteorological observations and sports is based on the application of Boyle's law. Q. Gay-Lussac's law states that the pressure exerted on the sides of a container by an ideal gas of fixed volume is proportional to its temperature. R. The mathematical expression P = kH c states Henry’s law.

  1. Only P

  2. Only Q

  3. Only R

  4. Both P and Q

  5. Both Q and R
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Only statement P is false.

Multiple choice

Van der Waals' constant tells us about

  1. molecular attraction

  2. molecular repulsion

  3. Both 1 and 2

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The van der Waals constant 'a' reflects the strength of the attractive forces between the gas particles and the constant 'b' is a measure of the actual volume occupied by a mol of gas particles. 

Multiple choice

At 0oC the density of Neon is

  1. maximum

  2. minimum

  3. 0

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

At 0oC and 2 atm pressure, the density of neon is maximum. 

Multiple choice

Which among the following can be excluded from the postulates of kinetic theory?

  1. The molecular collisions are perfectly inelastic in nature.

  2. The actual volume of the molecules is negligible as compared to the total volume of the gas.

  3. The molecules are in a state of constant rapid motion.

  4. All gases are made up of molecules.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The molecular collisions are perfectly elastic with no loss of energy and only redistribution of energy during collision.

Multiple choice

Equal volumes of different gases at any definite temperature and pressure have

  1. equal weight

  2. equal mass

  3. equal density

  4. equal no. of molecules

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is Avogadro's Law - equal volumes of gases at the same temperature and pressure contain equal numbers of molecules. The law is fundamental to understanding gas behavior and explains why gas reactions occur in simple whole-number ratios. Mass, weight, and density vary widely between different gases at equal volumes.

Multiple choice

Which of the following is correct about isobars? a. Horizontal distribution of pressure is studied by drawing isobars at constant levels. b. Isobars are lines connecting places having equal pressure. c. The more closely spaced the isobars are, the lesser the pressure gradient.

  1. Only a

  2. Only b

  3. Only c

  4. All of these

  5. Only options a and b
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct answer. Both statements given in option a and b are correct about isobars.

Multiple choice

Which of the following statements is incorrect regarding kinetic molecular theory of gases?

  1. Molecules move randomly in all directions.

  2. Attractional force between gas molecules is negligible.

  3. In comparison to the total volume of gas, molecules have comparable values.

  4. Gases are composed of a large number of particles that behave like hard spherical objects in a state of constant random motion.

  5. -
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In comparison to the total volume of gas, molecules have negligible volumes.