fluid mechanics objective questions with answers part6

Q1. 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

Q2. The angle of contact in case of a liquid depends upon
(A) the nature of the liquid and the solid
(B) the material which exists above the free surface of the liquid
(C) both of die above
(D) any one of the above

Q3. Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the
(A) force of adhesion
(B) force of cohesion
(C) force of friction
(D) force of diffusion

Q4. Rain drops are spherical because of
(A) viscosity
(B) air resistance
(C) surface tension forces
(D) atmospheric pressure

Q5. Surface energy per unit area of a surface is numerically equal to ..
(A) atmospheric pressure
(B) surface tension
(C) force of adhesion
(D) force of cohesion

Q6. The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately
(A) 5 mm
(B) 10 mm
(C) 20 mm
(D) 30 mm.

Q7. 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

Q8. To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than
(A) 2.4 m above the hydraulic gradient
(B) 6.4 m above the hydraulic gradient
(C) 10.0 m above the hydraulic gradient
(D) 5.0 above the hydraulic gradient

Q9. To avoid an interruption in the flow of a syphon, an air vessel is provided
(A) at the inlet
(B) at the outlet
(C) at the summit
(D) ay nay point between inlet and outlet

Q10. The vapour pressure over the concave surface is
(A) less man the vapour pressure over the plane surface
(B) equal to the vapour pressure over the plane surface
(C) greater than the vapour pressure over the plane surface
(D) zero

Q11. The property by virtue of which a liquid opposes relative motion between its different layers is called
(A) surface tension
(B) co-efficient of viscosity
(C) viscosity
(D) osmosis

Q12. The process of diffusion of one liquid into the other through a semi-permeable membrane is called
(A) viscosity
(B) osmosis
(C) surface tension
(D) cohesion

Q13. The continuity equation is connected with
(A) compressibility of fluids
(B) conservation of mass
(C) steady/unsteady flow
(D) open channel/pipe flow.

Q14. The rise or depression of liquid in a tube due to surface tensionwim increase in size of tube will
(A) increase
(B) remain unaffected
(C) may increase or decrease depending on the characteristics of liquid
(D) decrease

Q15. Liquids transmit pressure equally in all the directions. This is according to
(A) Boyle’s law
(B) Archimedes principle
(C) Pascal’s law
(D) Newton’s formula