fluid mechanics objective questions with answers part1

Q1. For measuring flow by a venturimeter, if should be installed in
(A) vertical line
(B) horizontal line
(C) inclined line with upward flow
(D) in any direction and in any location

Q2. Rotameter is a device used to measure
(A) absolute pressure
(B) velocity of fluid
(C) flow
(D) rotation

Q3. Flow of water in a pipe about 3 metres in diameter can be measured by
(A) orifice plate
(B) rotameter
(C) pitot tube
(D) nozzle

Q4. True one-dimensional flow occurs when
(A) the direction and magnitude of the veiocity at all points are identical
(B) the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
(C) the magnitude and direction of the velocity do not change from point to point in the fluid
(D) the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

Q5. An ideal flow of any fluid must satisfy
(A) Pascal law
(B) Newton’s law of viscosity
(C) boundary layer theory
(D) continuity equation

Q6. In the case of steady flow of a fluid, the acceleration of any fluid particle is
(A) constant
(B) variable
(C) zero
(D) zero under limiting conditions

Q7. During the opening of a valve in a pipe line, the flow is
(A) steady
(B) unsteady
(C) uniform
(D) laminar

Q8. Uniform flow occurs when
(A) the flow is steady
(B) the flow is streamline
(C) size and shape of the cross section in a particular length remain constant
(D) size and cross section change uniformly along length

Q9. Gradually varied flow is
(A) steady uniform
(B) non-steady non-uniform
(C) non-steady uniform
(D) steady non-uniform

Q10. Steady flow occurs when
(A) the direction and magnitude of the velocity at all points are identical
(B) the velocity of successive fluid particles, at any point, is the same at successive periods of time
(C) the magnitude and direction of the velocity do not change from point to point in the fluid
(D) the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

Q11. The flow which neglects changes in a transverse direction is known as
(A) one dimensional flow
(B) uniform flow
(C) steady flow
(D) turbulent flow

Q12. The flow in which each liquid particle has a definite path and their paths do not cross each other is called
(A) one dimensional flow
(B) steady flow
(C) turbulent flow
(D) streamline flow

Q13. The flow in which conditions do not change with time at any point, is known as
(A) one dimensional flow
(B) uniform flow
(C) steady flow
(D) turbulent flow

Q14. The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as
(A) one dimensional flow
(B) uniform flow
(C) steady flow
(D) turbulent flow

Q15. The flow in which the particles of a fluid attain such velocities that vary from point to point in magnitude and direction as well as from instant to instant, is known as
(A) one dimensional flow
(B) uniform flow
(C) steady flow
(D) turbulent flow

Q16. Flow occurring in a pipeline when a valve is being opened is
(A) steady
(B) unsteady
(C) laminar
(D) vortex

Q17. General energy equation holds for
(A) steady flow
(B) turbulent flow
(C) laminar flow
(D) non-uniform flow

Q18. A streamline is defined as the line
(A) parallel to central axis flow
(B) parallel to outer surface of pipe
(C) of equal velocity in a flow
(D) which occurs in all flows.

Q19. Two dimensional flow occurs when
(A) the direction and magnitude of the velocity at all points are identical
(B) the velocity of successive fluid particles, at any point, is the same at successive periods of time
(C) the magnitude and direction of the velocity do not change from point to point in the fluid
(D) the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

Q20. A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury ?
(A) 0.55
(B) 0.45
(C) 0.515
(D) 0.58