Arihant All in One Physics Class 12. We covered all the Arihant All in One Physics Class 12 in this post for free so that you can practice well for the exam.
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All in One Physics Mock Test for Students
A perfect gas at 27°C is heated at constant pressure so as to triple its volume. The temperature of the gas will be :
(A) 81 °C
(B) 900 °C
(C) 627 °C
(D) 450 °C
Option c – 627 °C
The mass of an oxygen molecule is about 16 times that of a hydrogen molecule. At room temperature, the RMS speed of the oxygen molecule is V. The RMS speed of the hydrogen molecule at the same temperature will be :
(A) V/16
(B) V/4
(C) 4V
(D) 16 V
Option c – 4V
A gas at a temperature of 250 K is contained in a closed vessel. If the gas is heated through 1°C the percentage increase in its pressure is :
(A) 0.4 %
(B) 0.6 %
(C) 0.8 %
(D) 1.0 %
Option a – 0.4 %
If a given mass of a gas occupies a volume of 100 cc at one atmospheric pressure and temperature of 100°C (373.15 K). What will be its volume at 4 atmospheric pressure, the temperature is the same? :
(A) 25 cc
(B) 100 cc
(C) 400 cc
(D) 104 cc
Option a – 25 cc
A jar has a mixture of hydrogen and oxygen gases in the ratio 1 : 5. The ratio of mean kinetic energies of hydrogen and oxygen molecules is :
(A) 1 : 5
(B) 5 : 1
(C) 1 : 1
(D) 1 : 25
Option c – 1 : 1
A sample of oxygen and a sample of hydrogen have the same mass, volume and pressure. The ratio of their absolute temperatures is :
(A) 1/4
(B) 4
(C) 1/16
(D) 16
Option d – 16
4 moles of an ideal gas are at 0°C. At constant pressure, it is heated to double its volume, and then its final temperature will be :
(A) 0°C
(B) 273 °C
(C) 546 °C
(D) 136.5 °C
Option b – 273 °C
At 100 K and 0.1 atmospheric pressure, the volume of helium gas is 10 litres. If volume and pressure are doubled, its temperature will change to :
(A) 400 K
(B) 127 K
(C) 200 K
(D) 25 K
Option a – 400 K
A sample of an ideal gas occupies a volume V at pressure P and absolute temperature T. The mass of each molecule is m. If k is Boltzmann’s constant then the density of the gas is :
(A) mkT
(B) P/kT
(C) P/kTV
(D) mP/kT
Option d – mP/kT
The volume of 2.8 g of carbon monoxide 27°C (CO) at and 0.821-atmosphere pressure is (R = 0.0821-litre atm/mol K) :
(A) 0.3 litre
(B) 3 litre
(C) 30 litre
(D) 60 litre
Option b – 3 litre
When a gas enclosed in a vessel is heated through 1°C, the pressure increases by 0.5% the initial temperature of the gas will be :
(A) 200 K
(B) 200 °C
(C) 2000 K
(D) 2000 °C
Option a – 200 K
The pressure exerted by hydrogen gas in a container is 4 atmosphere. If helium gas of the same mass is filled in a container, what is the pressure? :
(A) 4 atm
(B) 2 atm
(C) 8 atm
(D) 6 atm
Option b – 2 atm
The temperature of a gas at pressure P and volume V is 27°C. Keeping its volume constant if its temperature is raised to 927 °C, then its pressure will be :
(A) 2P
(B) 3P
(C) 4P
(D) 6P
Option c – 4P
The molecular weights of O₂ and N₂ are 32 and 28 respectively. At 15 °C, the pressure of 1g O₂ will be the same as that of 1g N₂ in the same bottle at the temperature :
(A) -21 °C
(B) 13 °C
(C) 15 °C
(D) 56.4 °C
Option a – -21 °C
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