The atmospheric pressure with rise in altitude decreases__________________?
(A) linearly
(B) first slowly and then steeply
(C) first steeply and then gradually
(D) unpredictable
(D) none of the above
Capillary action is due to the_________________?
(A) surface tension
(B) cohesion of the liquid
(C) adhesion of the liquid molecules and the molecules on the surface of a solid
(D) all of the above
(D) none of the above
For a floating body to be in equilibrium_____________________?
(A) meta centre should be above e.g.
(B) centre of buoyancy and e.g. must lie on same vertical plane
(C) a righting couple should be formed
(D) all of the above
(D) none of the above
Ratio of inertia force to elastic force is known as__________________?
(A) Mach number
(B) Froude number
(C) Reynold’s number
(D) Weber’s number
(D) none of the above
Ratio of inertia force to surface Jension is known as ___________________?
(A) Mach number
(B) Froude number
(C) Reynold’s number
(D) Weber’s number
(D) none of the above
When a body floating in a liquid, is displaced slightly, it oscillates about _________________?
(A) e.g. of body
(B) center of pressure
(C) center of buoyancy
(D) metacentre
(D) liquid surface
If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm”, the pressure at a depth of 50 m below the oil surface will be_________________?
(A) 2 meters of water column
(B) 3 meters of water column
(C) 5 meters of water column
(D) 6 meters of water Column
(D) 7 meters of water column
A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at water surface. The hydrostatic force on square surface is____________________?
(A) 9,000 kg
(B) 13,500 kg
(C) 18,000 kg
(D) 27,000 kg
(D) 30,000 kg
A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is_________________?
(A) 1
(B) 5
(C) 7
(D) 6
The center of pressure of a surface subjected to fluid pressure is the point_______________?
(A) on the surface at which resultant pres-sure acts
(B) on the surface at which gravitational force acis
(C) at which all hydraulic forces meet
(D) similar to metacentre
(D) where pressure equivalent to hydraulic thrust will act