The Concept of Pressure NEET Questions

Physics - Kinetic Theory of Gases

The Concept of Pressure MCQ Questions


7.
In the expression for pressure P = (1/3)nm v̄², what does v̄² represent?
A.
Speed of the fastest molecule
B.
Square of the mean speed
C.
Mean of the squared speeds of all molecules
D.
Speed of the slowest molecule
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ANSWER :
C. Mean of the squared speeds of all molecules
8.
The kinetic theory derivation of pressure uses the fact that the gas is isotropic. This means:
A.
All molecules move with equal speed
B.
There is no preferred direction of molecular velocities
C.
Pressure is different on different walls
D.
Molecules move only along the x-axis
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ANSWER :
B. There is no preferred direction of molecular velocities
9.
From isotropy of a gas, which of the following relations holds between mean squared velocity components?
A.
v̄x² = 2v̄y² = 2v̄z²
B.
v̄x² = v̄y² = v̄z² = v̄²
C.
v̄x² = v̄² and v̄y² = v̄z² = 0
D.
v̄x² = v̄y² = v̄z² = (1/3)v̄²
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ANSWER :
D. v̄x² = v̄y² = v̄z² = (1/3)v̄²
10.
According to Pascal's law as applied in kinetic theory, the pressure of a gas in equilibrium:
A.
Decreases towards the centre
B.
Is the same everywhere inside the container
C.
Varies with the direction of molecular motion
D.
Is highest near the walls
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ANSWER :
B. Is the same everywhere inside the container
11.
The kinetic theory expression PV = (2/3)E relates pressure and volume to:
A.
Total potential energy of molecules
B.
Total translational kinetic energy E of all molecules
C.
Total rotational energy of molecules
D.
Average speed of molecules
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ANSWER :
B. Total translational kinetic energy E of all molecules
12.
For a gas enclosed in a cube of side l, the area A of the wall used in the pressure derivation is:
A.
l³
B.
l²
C.
l
D.
2l²
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ANSWER :
B. l²