The Concept of Pressure NEET Questions

Physics - Kinetic Theory of Gases

The Concept of Pressure MCQ Questions


1.
In the kinetic theory derivation of pressure, a molecule with velocity (vx, vy, vz) hits a wall perpendicular to the x-axis. What is the change in momentum of the molecule after elastic collision?
A.
2mvx
B.
−mvx
C.
mvx
D.
−2mvx
😑 View Answer Rough Work Error
ANSWER :
D. −2mvx
2.
According to kinetic theory, the pressure exerted by an ideal gas on the walls of its container is given by:
A.
P = nm v̄²
B.
P = (1/2) nm v̄²
C.
P = (1/3) nm v̄²
D.
P = (2/3) nm v̄²
😑 View Answer Rough Work Error
ANSWER :
C. P = (1/3) nm v̄²
3.
In the kinetic theory derivation of gas pressure, 'n' in the expression P = (1/3)nm v̄² represents:
A.
Total number of molecules in the gas
B.
Avogadro's number
C.
Number of molecules per unit volume (number density)
D.
Number of moles of the gas
😑 View Answer Rough Work Error
ANSWER :
C. Number of molecules per unit volume (number density)
4.
The momentum imparted to the wall by a single molecule of mass m moving with x-component of velocity vx during one elastic collision is:
A.
mvx
B.
2mvx
C.
½mvx
D.
4mvx
😑 View Answer Rough Work Error
ANSWER :
B. 2mvx
5.
In deriving gas pressure, what fraction of molecules with x-component of velocity vx are moving towards a given wall at any instant?
A.
1/3
B.
All of them
C.
1/4
D.
1/2
😑 View Answer Rough Work Error
ANSWER :
D. 1/2
6.
The number of molecules with velocity component vx that hit a wall of area A in time Δt is:
A.
½ n A vx Δt
B.
¼ n A vx Δt
C.
n A vx Δt
D.
n A vx²Δt
😑 View Answer Rough Work Error
ANSWER :
A. ½ n A vx Δt