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Kinetic Theory of Gases MCQ. We covered all the Kinetic Theory of Gases MCQ in this post for free so that you can practice well for the exam.
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MCQ on Kinetic Theory of Gases for NEET Students
The average translational kinetic energy of gas molecules becomes three times higher if, at constant
(A) volume, the pressure is tripled.
(B) temperature, the pressure is increased threefold.
(C) pressure, the volume is reduced to one-third.
(D) temperature, the volume becomes three times greater.
Option a – volume, the pressure is tripled.
The average kinetic energy of gas molecules is
(A) not affected by the absolute temperature of the gas.
(B) directly related to the gas’s absolute temperature.
(C) inversely related to the gas’s absolute temperature.
(D) proportional to the square of the absolute temperature.
Option b – directly related to the gas’s absolute temperature.
If the molecules of an ideal gas have an average kinetic energy of 1 eV, what is its temperature?
(A) 3590 °C
(B) 4460 °C
(C) 5197 °C
(D) 7457 °C
Option d – 7457 °C
A beaker filled to the brim with water at 4 °C will overflow
(A) only when heated.
(B) only when cooled.
(C) whether it is heated or cooled.
(D) when kept at the same temperature.
Option c – whether it is heated or cooled.
If R is the universal gas constant, the thermal energy needed to increase the temperature of 3 moles of a monoatomic gas from 273 K to 373 K, without doing any work, is
(A) 100 R
(B) 300 R
(C) 450 R
(D) 500 R
Option c – 450 R
When an ideal gas with a volume of 20 liters is compressed isothermally to 2 liters, the RMS velocity of its molecules will
(A) increase by a factor of 5.
(B) reduce to one-fifth.
(C) become 10 times greater.
(D) remain constant.
Option d – remain constant.
Two monoatomic ideal gases with atomic mass ratio 2:3 have partial pressure ratio 3:4 at constant temperature. Their density ratio will be
(A) 1 : 4
(B) 1 : 2
(C) 6 : 9
(D) 8 : 9
Option b – 1 : 2
The degrees of freedom possessed by a single atom are
(A) two
(B) three
(C) five
(D) seven
Option b – three
A triatomic gas exhibits how many degrees of freedom?
(A) two
(B) four
(C) six
(D) eight
Option c – six
A gas is at 73 °C. To double the root mean square speed of its molecules, to what temperature must it be heated?
(A) 357 °C
(B) 457 °C
(C) 527 °C
(D) 820 °C
Option c – 527 °C
One mole of a monoatomic ideal gas requires 200 J of heat to increase the temperature by 10 K at constant pressure. If heated at constant volume for the same temperature rise, the heat needed is
(A) 120 J
(B) 210 J
(C) 238 J
(D) 350 J
Option a – 120 J
The total number of molecules in one gram-mole of gas is referred to as
(A) universal gas constant
(B) Boltzmann constant
(C) Avogadro’s number
(D) Planck’s constant
Option c – Avogadro’s number
At the same temperature, the ratio of average kinetic energy of oxygen to that of hydrogen is
(A) 1 : 16
(B) 1 : 8
(C) 1 : 4
(D) 1 : 1
Option d – 1 : 1
If the universal gas constant R is a multiple of the molar specific heat at constant pressure (Cp) for a monoatomic ideal gas, what is the value of the multiplier n?
(A) 0.4
(B) 0.67
(C) 1.4
(D) 1.67
Option a – 0.4
One mole of a gas has a volume of 100 ml at a pressure of 50 mm Hg. What volume will four moles occupy at 100 mm Hg pressure, keeping the temperature unchanged?
(A) 50 ml
(B) 100 ml
(C) 200 ml
(D) 150 ml
Option c – 200 ml
If the root mean square speed of oxygen molecules at NTP is 0.5 km/s, what would be the root mean square speed of hydrogen molecules under the same conditions?
(A) 4 km/s
(B) 2 km/s
(C) 3 km/s
(D) 1 km/s
Option b – 2 km/s
When the temperature of a gas is raised while maintaining constant volume, the time taken to traverse the mean free path
(A) decreases
(B) increases
(C) becomes unpredictable
(D) stays the same
Option a – decreases
At what temperature do the Kelvin and Fahrenheit scales show the same reading?
(A) 574.25 °F
(B) 574.25 °C
(C) 100 °F
(D) 273 K
Option a – 574.25 °F
The temperature at which the average kinetic energy of an ideal gas molecule becomes three times that at 337 °C is
(A) 540 °C
(B) 1527 °C
(C) 1356 °C
(D) 1629 °C
Option b – 1527 °C
As per the kinetic theory of gases, gas particles
(A) exert repulsive forces on each other
(B) undergo perfectly elastic collisions
(C) travel with constant velocity
(D) have no mass
Option b – undergo perfectly elastic collisions
At constant pressure, what temperature would make the root mean square speed of gas molecules half of what it is at 0 °C?
(A) 0 °C
(B) 32 °C
(C) -273 °C
(D) -205 °C
Option d – -205 °C
What is the mass of helium needed to fill a 4.0-liter balloon at a pressure of 1.1 atm and a temperature of 42 °C?
(A) 865 g
(B) 665 g
(C) 216 g
(D) 90 g
Option b – 665 g
A pyrometer is an instrument used for measuring
(A) high temperatures
(B) low temperatures
(C) latent heat
(D) specific heat
Option a – high temperatures
If the RMS speed of a gas at temperature T °C is twice its value at 37 °C, then the temperature T is
(A) 967
(B) 820
(C) 1000
(D) 195
Option a – 967
When 80 calories of heat is supplied to a monoatomic gas at constant pressure to increase its temperature from 30 °C to 35 °C, how much heat would be required to achieve the same temperature change at constant volume?
(A) 30 cal
(B) 48 cal
(C) 70 cal
(D) 105 cal
Option b – 48 cal
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