The Concept of Pressure NEET Questions

Physics - Kinetic Theory of Gases

The Concept of Pressure MCQ Questions


13.
In the pressure derivation, after an elastic collision with the wall, which velocity components of the molecule change?
A.
All three components reverse
B.
Only y and z components change
C.
None of the components change
D.
Only the x-component reverses; y and z components remain unchanged
😑 View Answer Rough Work Error
ANSWER :
D. Only the x-component reverses; y and z components remain unchanged
14.
The total momentum transferred to a wall by molecules with speed vx in time Δt (for n molecules per unit volume, area A) is:
A.
Q = (2mvx)(n A vx Δt)
B.
Q = (2mvx)(½ n A vx Δt)
C.
Q = (mvx)(n A vx Δt)
D.
Q = (mvx)(½ n A vx Δt)
😑 View Answer Rough Work Error
ANSWER :
B. Q = (2mvx)(½ n A vx Δt)
15.
The pressure on a wall is obtained from the momentum transfer Q in time Δt as:
A.
P = Q / Δt
B.
P = Q × A / Δt
C.
P = Q / (A Δt)
D.
P = Q × A × Δt
😑 View Answer Rough Work Error
ANSWER :
C. P = Q / (A Δt)
16.
What is the physical reason that only half the molecules with velocity component vx contribute to hitting a given wall?
A.
On average, half move towards the wall and half move away from it
B.
Half the molecules have zero x-velocity
C.
Only molecules near the wall contribute
D.
Half the molecules are at rest
😑 View Answer Rough Work Error
ANSWER :
A. On average, half move towards the wall and half move away from it
17.
The pressure of a gas mixture of non-interacting ideal gases (Dalton's law) from kinetic theory is:
A.
P = (n₁ × n₂ × …) kB T
B.
P = n₁ kB T only
C.
P = (n₁ - n₂) kB T
D.
P = (n₁ + n₂ + …) kB T
😑 View Answer Rough Work Error
ANSWER :
D. P = (n₁ + n₂ + …) kB T
18.
From the kinetic theory expression P = (1/3)nm v̄², the rms speed vrms of nitrogen at 300 K is approximately:
A.
100 m/s
B.
1000 m/s
C.
516 m/s
D.
300 m/s
😑 View Answer Rough Work Error
ANSWER :
C. 516 m/s