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UP Board Class 12 Physics Chapter 1. We covered all the UP Board Class 12 Physics Chapter 1 in this post for free so that you can practice well for the exam.
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- Pradeep Physics Class 12 Volume 2
- Physics Class 12 Chapter 1 Important Questions in Hindi
- Bharati Bhawan Class 12 Physics
Class 12 Physics mcqs for Competitive Exams
The average kinetic energy of gas molecules can be calculated if we know:
a) The number of molecules in the gas
b) Only the pressure of the gas
c) Only the temperature of the gas
d) None of these alone is sufficient
Option c – Only the temperature of the gas
If an oxygen Molecule has an RMS velocity of 0.5 km/s at a certain temperature, the RMS velocity of a hydrogen Molecule at the same temperature will be:
a) 2 km/s
b) 4 km/s
c) 9 km/s
d) 16 km/s
Option a – 2 km/s
A gas has an RMS velocity of 300 m/s. If another gas has twice the Molecular weight and half the temperature, its RMS velocity will be:
a) 300 m/s
b) 600 m/s
c) 75 m/s
d) 150 m/s
Option d – 150 m/s
If a gas is compressed isothermally, the RMS speed of its molecules:
a) Increases
b) Decreases
c) Increases then decreases
d) Remains unchanged
Option d – Remains unchanged
For an ideal gas, if the temperature rises from 120 K to 480 K and the RMS velocity at 120 K is V, the RMS velocity at 480 K will be:
a) 4V
b) 2V
c) V/2
d) V/4
Option b – 2V
A gas at 0°C will have its RMS speed doubled at approximately:
a) 273°C
b) 1092°C
c) 819°C
d) 103°C
Option c – 819°C
Hydrogen at 327°C is cooled at constant pressure. To reduce the RMS velocity of its molecules to half, the final temperature should be:
a) –123°C
b) 123°C
c) –100°C
d) 0°C
Option a – –123°C
The temperature at which hydrogen molecules have the same RMS velocity as oxygen molecules at 47°C is:
a) 20 K
b) 80 K
c) –73 K
d) 3 K
Option a – 20 K
Hydrogen molecules have an RMS velocity of 1930 m/s at 300 K. The RMS velocity of oxygen molecules at 1200 K will be:
a) 482.5 m/s
b) 965 m/s
c) 1930 m/s
d) 3860 m/s
Option b – 965 m/s
The temperature of hydrogen at which its RMS speed equals that of oxygen molecules at 31°C is:
a) –216°C
b) –235°C
c) –254°C
d) –264°C
Option c – –254°C
The temperature at which nitrogen molecules have the same RMS velocity as oxygen molecules at 127°C is:
a) 77°C
b) 350°C
c) 273°C
d) 457°C
Option a – 77°C
We covered all the UP Board Class 12 Physics chapter 1 mcqs above in this post for free so that you can practice well for the exam.
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Also, check out:
- Pradeep Physics Class 12 Volume 2
- Physics Class 12 Chapter 1 Important Questions in Hindi
- Bharati Bhawan Class 12 Physics
