NEET Previous Year Questions (2014-2024): Kinetic Theory

# NEET Previous Year Questions (2014-2024): Kinetic Theory | Physics Class 11 PDF Download

## 2023

Q1: The temperature of a gas is –50°C. To what temperature the gas should be heated so that the rms speed is increased by 3 times?     [2023]
(a) 669°C
(b) 3295°C
(c) 3097 K
(d) 223 K
Ans:
(b)

T1 = 273− 50
= 223 K
vrms is increased by 3 times
T2 = ?
So, final rms speed = v + 3v = 4v

## 2021

Q1: Match column - I and column - II and choose the correct match from the given choices.     [2021]

(a) (A) - (Q), (B) - (P), (C) - (S), (D) - (R)
(b) (A) - (R), (B) - (Q), (C) - (P), (D) - (S)
(c) (A) - (R), (B) - (P), (C) - (S), (D) - (Q)
(d) (A) - (Q), (B) - (R), (C) - (S), (D) - (P)
Ans:
(a)
Root mean square speed of gas molecules

## 2020

Q1: A cylinder contains hydrogen gas at pressure of 249 kPa and temperature 27°C.
Its density is : (R = 8.3 J mol-1 K-1)     [2020]
(a) 0.1 kg/m3

(b) 0.02 kg/m3
(c) 0.5 kg/m3
(d) 0.2 kg/m3
Ans: (d)
∴ PV = nRT

Q2: The mean free path for a gas, with molecular diameter d and number density n can be expressed as :     [2020]
(a)

(b)

(c)

(d)

Ans:
(d)
The mean free path for gas is given by

Q3: The average thermal energy for a mono-atomic gas is (kB is Boltzmann constant and T, absolute temperature)   [2020]
(a) 1/2kBT
(b) 3/2kBT
(c) 5/2kBT
(d) 7/2kBT
Ans:
(a)
For mono-atomic gas, degree of freedom = 3
Energy associated with each degree of freedom = 1/2kBT
So, energy is 3/2kBT

## 2019

Q1: Increase in temperature of a gas filled in a container would lead to:    [2019]
(a) Increase in its mass
(b) Increase in its kinetic energy
(c) Decrease in its pressure
(d) Decrease in intermolecular distance
Ans:
(b)
Solution: Increase in temperature would lead to the increase in kinetic energy of gas (assuming far as to be ideal) as

## 2018

Q1: At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the Earth's atmosphere ? (Given: Mass of oxygen molecule (m) = 2.76 × 10–26 kg Boltzmann's constant kB = 1.38 × 10–23 J K–1):-    [2018]
(a) 2.508 × 104 K
(b) 8.360 × 104 K
(c) 5.016 × 104 K
(d) 1.254 × 104 K
Ans:
(b)
Solution:

## 2017

Q1: The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T(Kelvin) and mass m, is:-    [2017]
(a)
(b)
(c)
(d)
Ans:
(a)
Solution: Kinetic energy of thermal neutron with equilibrium

Q2: A gas mixture consists of 2 moles of O2 and 4 moles of Ar at temperature T. Neglecting all vibrational modes, the total internal energy of the system is:-    [2017]
(a) 15 RT
(b) 9 RT
(c) 11 RT
(d) 4 RT
Ans:
(c)
Solution:

## 2016

Q1: The molecules of a given mass of a gas have r.m.s. velocity of 200 ms-1 at 27°C and 1.0 x 10-5 Nm-2 pressure. When the temperature and pressure of the gas are respectively, 127°C and 0.05 x 105Nm2, the r.m.s. velocity of velocity of its molecules in ms-1 is;    [2016]
(a) 100 / 3
(b) 100 √2
(c) 400 / √3
(d) 100√2 / 3
Ans:

Solution:
It is given that,
vrms = 200 m/s
T1 = 300 K
P1 = 105 N/m2
rms velocity of gas molecules,
For two different cases,

It is given that,
vrms = 200 m/s
T1 = 300 K
P1 = 105 N/m2
rms velocity of gas molecules,
For two different cases,

Q2: A given sample of an ideal gas occupies a volume V at a pressure P and absolute temperature T.  The mass of each molecule of the gas is m. Which of the following gives the density of the gas ?       [2016]
(a) P/(kT)
(b) Pm/(kT)
(c) P/(kTV)
(d) mkT
Ans:
(b)
As PV = nRT
or

## 2015

Q1: The ratio of the specific heats  in terms of degrees of freedom (n) is given by:    [2015]
(a)
(b)
(c)
(d)
Ans:
(d)
Solution:

This fits into the pattern    , where n is the number of the degrees of freedom

Q2: Two vessels separately contain two ideal gases A and B at the same temperature, the pressure of A being twice that of B. Under such conditions, the density of A is found to be 1.5 times the density of B. The ratio of molecular weight of A and B is
(a) 2
(b) 1/2
(c) 2/3
(d) 3/4    [2015]
Ans:
(d)
According to an ideal gas equation, the molecular weight of an ideal gas is
M = ρRT / P

where P, T and r are the pressure, temperature and density of the gas respectively and R is the universal gas constant.
∴ The molecular weight of A is

and that of B is

Hence, their corresponding ratio is

## 2014

Q1: The mean free path of molecules of a gas,(radius ‘r’) is inversely proportional to:    [2014]
(a) r
(b) √r
(c) r3
(d) r2
Ans:
(d)
Solution:

The document NEET Previous Year Questions (2014-2024): Kinetic Theory | Physics Class 11 is a part of the NEET Course Physics Class 11.
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## Physics Class 11

102 videos|411 docs|121 tests

## FAQs on NEET Previous Year Questions (2014-2024): Kinetic Theory - Physics Class 11

 1. What is the Kinetic Theory of Gases?
Ans. The Kinetic Theory of Gases states that gases are made up of small particles (atoms or molecules) that are in constant, random motion. The theory explains the behavior of gases based on the motion of these particles.
 2. How does temperature affect the kinetic energy of gas particles?
Ans. According to the Kinetic Theory of Gases, the average kinetic energy of gas particles is directly proportional to the temperature. As the temperature increases, the kinetic energy of the gas particles also increases.
 3. How does pressure relate to the Kinetic Theory of Gases?
Ans. In the Kinetic Theory of Gases, pressure is related to the frequency and force of collisions between gas particles and the walls of the container. An increase in pressure indicates more frequent and forceful collisions.
 4. What is the root mean square speed of gas particles according to the Kinetic Theory of Gases?
Ans. The root mean square speed of gas particles is the square root of the average of the squares of the speeds of all gas particles. It is a measure of the average speed of gas particles in a sample.
 5. How does the Kinetic Theory of Gases explain the relationship between volume and pressure?
Ans. According to the Kinetic Theory of Gases, when the volume of a gas is decreased, the gas particles have less space to move, leading to more frequent collisions with the container walls, resulting in increased pressure. This relationship is known as Boyle's Law.

## Physics Class 11

102 videos|411 docs|121 tests

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