A. L/4
B. L/3
C. L/2
D. L
✅ The correct answer is option A.
Fluid Mechanics MCQs
Stream lines and path lines always coincide in case of__________________?
A. steady flow
B. laminar flow
C. uniform flow
D. turbulent flow
✅ The correct answer is option A.
The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is__________________?
A. 0.40 cm
B. 0.20 cm
C. 0.10 cm
D. 0.05 cm
✅ The correct answer is option B.
The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is_______________?
A. 1/2
B. 2/3
C. 3/2
D. 2
✅ The correct answer is option A.
The length of a pipe is 1 km and its diameter is 20 cm. If the diameter of an equivalent pipe is 40 cm, then its length is_____________________?
A. 32 km
B. 20 km
C. 8 km
D. 4 km
✅ The correct answer is option A.
The viscosity of a gas_______________?
A. decreases with increase in temperature
B. increases with increase in temperature
C. is independent of temperature
D. is independent of pressure for very high pressure intensities
✅ The correct answer is option B.
In steady flow of a fluid, the total accele ration of any fluid particle______________?
A. can be zero
B. is never zero
C. is always zero
D. is independent of coordinates
✅ The correct answer is option A.
Coefficient of contraction for an external cylindrical mouthpiece is_________________?
A. 1.00
B. 0.855
C. 0.7H
D. 0.611
✅ The correct answer is option A.
The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be_________________?
A. 0.423 D
B. 0.577 D
C. 0.223 D
D. 0.707 D
✅ The correct answer is option B.
The theoretical value of coefficient of contraction of a sharp edged orifice is_______________?
A. 0.611
B. 0.85
C. 0.98
D. 1.00
✅ The correct answer is option A.