A balloon lifting in air follows the following principle_________________?

Related Mcqs:

A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, what fraction of it volume is under mercury ?

A. the metal piece will simply float over the mercury B. the metal piece will be immersed in mercury by half C. whole of the metal piece will be immersed with its top surface just at mercury level D. metal piece will sink to the bottom E. none of the above...

The pressure at a point in a fluid will not be same in all the directions when the fluid is________________?

A. moving B. viscous C. viscous and static D. inviscous and moving E. viscous and moving...

If the surface of liquid is convex, men_________________?

A. cohesion pressure is negligible B. cohesion pressure is decreased C. cohesion pressure is increased D. there is no cohesion pressure E. 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 E. liquid surface...

For pipes, turbulent flow occurs when Reynolds number is_________________?

A. less than 2000 B. between 2000 and 4000 C. more than 4000 D. less than 4000 E. none of the above...