A. Increased, as it rises to a higher altitude
B. Due to the weight of the atmospheric air, that it displaces
C. Not dependent on the temperature of the atmosphere
D. None of these
Related Mcqs:
- What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the air-water interface? The balloon is of radius 0.1 m and is filled with air ?
A. 4πg/3
B. 0.01 πgH/4
C. 0.01 πgH/8
D. 0.04 πgH/3 - Actual lift of a pump is always less than the theoretical lift and is limited by the__________________________?
A. Specific gravity & temperature of the liquid
B. Leakage & pressure decreasing at higher elevations
C. Frictional resistance through pipes, fittings & passages
D. All A., B. and C. - What is the maximum theoretical suction lift (metres) of a reciprocating pump ?
A. 5
B. 10
C. 50
D. 100 - Purpose of air lift pump is to____________________?
A. Compress air
B. Lift compressed air
C. Lift water from a well by using compressed air
D. Lift air under negative pressure - Which of the following conditions must be satisfied for lift force to be developed ?
A. The body should be bluff body
B. The body should be stream lined
C. Circulation around the body is essentially required
D. The main stream velocity must approach the velocity of sound in that fluid medium - Maximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be _____________________ ft?
A. 40
B. 34
C. 8
D. 37 - The co-efficient of drag and lift for an incompressible fluid depends on the_________________?
A. Reynolds number
B. Froude number
C. Mach number
D. All A., B. and C. - A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun’s equation for the above fluid-particle system (in SI units) is given below : Δ P/L = 375 × 103 VOM + 10.94 × 106 V2 OM (SI units) If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is_________________?
A. 12 mm/s
B. 16 mm/s
C. 24 mm/s
D. 28 mm/s - Dimension of absolute viscosity is_________________?
A. ML-1T-1
B. MLT-1
C. ML-1T
D. MLT - In open channel flow in a rectangular channel, the ratio between the critical depth and the initial depth, when a hydraulic jump occurs is_________________?
A. 0.5
B. 0.84
C. 1.84
D. 1.25
