🔥 Kinetic Theory of Gases – Stage 3 (Page 5)
Ultimate Mixed Concept Problems (IIT-JEE Advanced)
This page tests whether you truly understand: temperature, pressure, collisions, degrees of freedom, and energy flow.
🔹 Question 1 (Temperature vs Speed Trap)
Two gases A and B have the same RMS speed. Molecular mass of A is four times that of B. Which statement is correct?
- A) Temperature of A is higher
- B) Temperature of B is higher
- C) Both have same temperature
- D) Data insufficient
Correct Answer: B
Explanation:
vrms = √(3kT/m)
If mA = 4mB, then TA = 4TB is needed for same speed.
Given speeds are same → lighter gas must be hotter.
🔹 Question 2 (Container Acceleration)
A gas is enclosed in a container accelerating horizontally. Which wall experiences maximum pressure?
- A) Front wall
- B) Back wall
- C) Both equal
- D) Depends on temperature
Correct Answer: B
Concept:
In non-inertial frame, pseudo force increases collision frequency at back wall.
🔹 Question 3 (Energy Distribution)
Which quantity depends only on temperature and not on molecular mass?
- A) RMS speed
- B) Average speed
- C) Mean kinetic energy
- D) Momentum
Correct Answer: C
Reason:
⟨KE⟩ = (3/2)kT (independent of mass)
🔹 Question 4 (Free Expansion + Collision)
Gas expands freely into vacuum. After expansion:
- A) Collision frequency increases
- B) Collision frequency decreases
- C) Temperature increases
- D) RMS speed changes
Correct Answer: B
Why?
Volume increases → number density decreases → fewer collisions.
🔹 Question 5 (Degrees of Freedom)
At very high temperature, a diatomic gas behaves like:
- A) Monoatomic gas
- B) Polyatomic gas
- C) Rigid body
- D) Plasma
Correct Answer: B
Explanation:
Vibrational modes activate at high temperature.
🔹 Question 6 (Speed Distribution Curve)
If temperature increases:
- A) Peak shifts left
- B) Peak height increases
- C) Curve broadens
- D) Area changes
Correct Answer: C
Key Idea:
Area remains constant (same number of molecules).
⚠️ Ultimate IIT Traps on This Page
- Same speed ≠ same temperature
- Acceleration changes pressure distribution
- Free expansion changes collision frequency, not temperature
🏁 Stage 3 – Page 5 Completed (KTG Mastery Level)
📚 IIT–JEE Physics Complete Library (Class XI)
Curated for IIT-JEE Advanced Aspirants
Concepts • Numericals • Objective Questions • Revision Capsules
🔥 Kinetic Theory of Gases (KTG) – Complete Library
- KTG – Part 1
- KTG – Part 2
- KTG – Part 3
- KTG – Part 4
- KTG – Part 5
- KTG – Part 6
- KTG – Part 7
- KTG – Special Notes
- KTG – Part 9
- KTG – Part 10
- KTG – Part 11
- KTG – Part 12
- KTG – Part 13
- KTG – Part 14
- KTG – Part 15
- KTG – Part 16
- KTG – Part 17
- KTG – Part 18
- KTG – Part 19
- KTG – Part 20
- KTG – Part 21
- KTG – Part 22
- KTG – Part 23
- KTG – Part 24
- KTG – Part 25
- KTG – Part 26
- KTG – Part 27
- KTG – Part 28
- KTG – Part 29
- KTG – Part 30
📐 Properties of Matter – Complete IIT-JEE Library
- Properties – Part 1
- Properties – Part 2
- Properties – Part 3
- Properties – Part 4
- Properties – Part 5
- Properties – Part 6
- Properties – Part 7
- Properties – Part 8
- Properties – Part 9
- Properties – Part 10
- Properties – Part 11
- Properties – Part 12
- Properties – Part 13
- Properties – Part 14
- Properties – Part 15
- Properties – Part 16
- Properties – Part 17
- Properties – Part 18
- Properties – Part 19
- Properties – Part 20
- Properties – Part 21
- Properties – Part 22
- Properties – Part 23
- Properties – Part 24
- Properties – Part 25
🌟 Master & Mega Physics Libraries
- IIT-JEE Physics Master Library
- Physics Complete Mega Library
- SHM Complete Library
- Waves – JEE Advanced Library
- Gravitation Library
- Momentum & Collisions Library
- Centre of Mass Library
- Work Energy Power Library
No comments:
Post a Comment