Unit 16 Solved MCQ'S Class 12 Physics| National book foundation | Statistical Mechanics | Thermodyna

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Which of the following motions of ideal gas molecules determines the temperature?
A. Translational motion B. Rotational motion
C. Vibrational motion D. All types of motion.
Which of the following gases possesses the maximum root mean square velocity at the same temperature?
A. Oxygen B. Carbon dioxide C. Hydrogen D. Helium
Real gases deviate from ideal behavior because gas molecules:
A. are colorless B. are spherical
C. have intermolecular forces of attraction D. have high speeds
The root mean square speed of gas at 27^\circ \text{C} is V_{\text{r.m.s.}}. If the temperature of the gas is raised to 327^\circ \text{C}, then which of the following will be the root mean square speed of gas?
A. (1/\sqrt{2}) V_{\text{r.m.s.}} B. V_{\text{r.m.s.}} C. \sqrt{2} V_{\text{r.m.s.}} D. 2 V_{\text{r.m.s.}}
Which of the following is the ratio of root mean square speed of oxygen \text{O}_2 and hydrogen \text{H}_2 at same temperature?
A. 1:2 B. 2:1 C. 1:4 D. 4:1
Density of a gas is 5 \text{ kg m}^{-3} at a pressure of 6 \times 10^5 \text{ Pa}. Which of the following is the root mean square velocity of the gas molecules?
A. 600 \text{ m s}^{-1} B. 400 \text{ m s}^{-1} C. 300 \text{ m s}^{-1} D. 180 \text{ m s}^{-1}
The average kinetic energy of gas molecules is:
A. directly proportional to pressure of gas B. inversely proportional to volume of gas
C. inversely proportional to the absolute temperature of gas
D. directly proportional to the absolute temperature of gas
The pressure is exerted by the gas on the walls of the container because its molecules:
A. lose kinetic energy B. stick to the walls
C. on collision with the walls, there is a change in momentum
D. on collision with the walls, gas molecules exert no force on wall
The rms speed of the molecules of enclosed gas is V_{\text{r.m.s.}}. Which of the following will be the rms speed of gas molecule, if pressure is doubled keeping the temperature same?
A. 1/2 V_{\text{r.m.s.}} B. V_{\text{r.m.s.}} C. 2 V_{\text{r.m.s.}} D. 4 V_{\text{r.m.s.}}
A neutron star has a super high _______.
A. density B. output of light C. input of neutrons D. output of x-rays
Which of the following is the electrical resistance of the superconductor below critical temperature?
A. Finite B. Large C. Zero D. Infinity
What is the process by which a Bose-Einstein Condensate is formed?
A. Fusion B. Fission
C. Decomposition D. Cooling to extremely low temperature
From the second image (t reduced):
Multiple Choice Questions
Encircle the Correct option.
Which of the following is the correct relation between pressure 'P' and density '\rho' of the gas, at constant temperature?
A. P \propto \frac{1}{\rho} B. P \propto \frac{1}{\rho^2} C. P \propto \rho D. P \propto \rho^2
Which of the following is correct formula for the root mean square speed of a molecule in a gas at the absolute temperature T?
A. V_{\text{r.m.s.}} = 1.5 \sqrt{\frac{kT}{m}} B. V_{\text{r.m.s.}} = 1.5 \sqrt{\frac{mk}{T}} C. V_{\text{r.m.s.}} = 1.73 \sqrt{\frac{m}{kT}} D. V_{\text{r.m.s.}} = 1.73 \sqrt{\frac{kT}{m}}

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