JEE Main · Physics ↓ Falling

Kinetic Theory of Gases appeared 26 times across 3 years — 3% of Physics. This question is from Gas Laws.

Year 2026 2025 2024 Total
Questions 6 11 9 26

An air bubble of volume 2.9 cm³ rises from the bottom of a swimming pool of 5 m deep. At the bottom of the pool water temperature is 17 °C . The volume of the bubble when it reaches the surface, where the water temperature is 27 °C , is ____ cm³ . (g = 10 m/s² , density of water = 10³ kg/m³ , and 1 atm pressure is 10⁵ Pa )

Solution & Explanation

Related Formula
(P₁ V₁)/(T₁) = (P₂ V₂)/(T₂) P = Patm + ρ g h
Core Logic

Gas Laws diagram for Q36 - JEE Main 2026 Evening
Gas Laws diagram for Q36 - JEE Main 2026 Evening

For an air bubble rising in water, the number of moles of gas remains constant. P₁ = Pressure at bottom = Patm + ρ gh T₁ = Temperature at bottom = 17°C = 290 K V₁ = 2.9 cm³

P₂ = Pressure at surface = Patm T₂ = Temperature at surface = 27°C = 300 K

Step 1: Calculate Pressures
P₁ = 10⁵ + (10³ × 10 × 5) = 10⁵ + 50,000 = 1.5 × 10⁵ Pa P₂ = 10⁵ Pa
Step 2: Apply Ideal Gas Law
((1.5 × 10⁵)(2.9))/(290) = ((10⁵)(V₂))/(300) (1.5 × 2.9)/(290) = (V₂)/(300) V₂ = (1.5 × 2.9 × 300)/(290) = 1.5 × 3 = 4.5 cm³
Pattern Recognition

Standard combined gas law application. Always remember to convert Celsius to Kelvin and carefully compute gauge pressure plus atmospheric pressure for the submerged state.

Chapter Mix

Class 11 Physics: Kinetic Theory of Gases Class 11 Physics: Mechanical Properties of Fluids

Reference Study Guides

More Kinetic Theory of Gases Previous-Year Questions — Page 6

Q31 jee_main_2024_31_jan_morning Kinetic Energy Of Gas Molecules
The parameter that remains the same for molecules of all gases at a given temperature is :
  • A. kinetic energy
  • B. momentum
  • C. mass
  • D. speed

Solution

Related Formula
KE = (f)/(2)kT
Core Logic

The average translational kinetic energy of any gas molecule depends only on the absolute temperature of the gas and is independent of the nature or mass of the gas.

For 1 mole of any ideal gas, the average translational kinetic energy is (3)/(2)RT. Therefore, at a given temperature, the kinetic energy parameter is uniform across all ideal gases.

Pattern Recognition

Temperature is directly proportional to average translational kinetic energy. If T is constant, KE is constant for all gases regardless of mass.

Chapter Mix

Class 11 Physics: Kinetic Theory

More Kinetic Theory of Gases Questions — jee_main_2026_23_january_evening

Practice all Kinetic Theory of Gases previous-year questions →

Rankbit System
JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%) | JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%)