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Q1. The force of buoyancy is always __ the weight of the liquid displaced by the body.
(A) Equal to
(B) Less than
(C) More than
(D) None of these
Answer: (A) Equal to
Q2. The specific gravity of an oil whose specific weight is 7.85 kN/m3, is
(A) 0.8
(B) 1
(C) 1.2
(D) 1.6
Answer: (A) 0.8
Q3. A flow in which the viscosity of fluid is dominating over the inertia force is called
(A) Steady flow
(B) Unsteady flow
(C) Laminar flow
(D) Turbulent flow
Answer: (C) Laminar flow
Q4. The total pressure on the top of a closed cylindrical vessel completely filled up with a liquid is
(A) Directly proportional to (radius)2
(B) Inversely proportional to (radius)2
(C) Directly proportional to (radius)4
(D) Inversely proportional to (radius)4
Answer: (C) Directly proportional to (radius)4
Q5. To avoid an interruption in the flow of a siphon, an air vessel is provided
(A) At the inlet
(B) At the outlet
(C) At the summit
(D) At any point between inlet and outlet
Answer: (C) At the summit
Q6. A nozzle is generally made of
(A) Cylindrical shape
(B) Convergent shape
(C) Divergent shape
(D) Convergent-divergent shape
Answer: (B) Convergent shape
Q7. 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
Answer: (C) Size and shape of the cross section in a particular length remain constant
Q8. In a venturi-flume, the flow takes place at
(A) Atmospheric pressure
(B) Gauge pressure
(C) Absolute pressure
(D) None of these
Answer: (A) Atmospheric pressure
Q9. An error of 1% in measuring head over the apex of the notch (H) will produce an error of _ in discharge over a triangular notch.
(A) 1 %
(B) 1.5 %
(C) 2 %
(D) 2.5 %
Answer: (D) 2.5 %
Q10. The velocity at which the laminar flow stops, is known as
(A) Velocity of approach
(B) Lower critical velocity
(C) Higher critical velocity
(D) None of these
Answer: (B) Lower critical velocity
Q11. The ratio of the inertia force to the elastic force is called
(A) Reynold’s number
(B) Froude’s number
(C) Weber’s number
(D) Mach number
Answer: (D) Mach number
Q12. Coefficient of contraction is the ratio of
(A) Actual velocity of jet at vena contracta to the theoretical velocity
(B) Loss of head in the orifice to the head of water available at the exit of the orifice
(C) Loss of head in the orifice to the head of water available at the exit of the orifice
(D) Area of jet at vena-contracta to the area of orifice
Answer: (D) Area of jet at vena-contracta to the area of orifice
Q13. With an increase in size of tube, the rise or depression of liquid in the tube due to surface tension will
(A) Decrease
(B) Increase
(C) Remain unchanged
(D) Depend upon the characteristics of liquid
Answer: (A) Decrease
Q14. A flow in which each liquid particle has a definite path, and the paths of individual particles do not cross each other, is called
(A) Steady flow
(B) Uniform flow
(C) Streamline flow
(D) Turbulent flow
Answer: (C) Streamline flow
Q15. When a vertical wall is subjected to pressures due to liquid on both sides, the resultant pressure is the __ of the two pressures.
(A) Sum
(B) Difference
(C) Arithmetic mean
(D) Geometric mean
Answer:(B) Difference
Q16. Froude’s number is the ratio of inertia force to
(A) Pressure force
(B) Elastic force
(C) Gravity force
(D) Surface tension force
Answer: (C) Gravity force
Q17. The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called
(A) Surface tension
(B) Compressibility
(C) Capillarity
(D) Viscosity
Answer: (D) Viscosity
Q18. The density of water is 1000 kg/m3 at
(A) 0° C
(B) 0° K
(C) 4° C
(D) 20° C
Answer:(C) 4° C
Q19. The length of the divergent cone in a Venturimeter is __ that of the convergent cone.
(A) Equal to
(B) Double
(C) Three to four times
(D) Five to six times
Answer: (C) Three to four times
Q20. The hydraulic mean depth or the hydraulic radius is the ratio of
(A) Area of flow and wetted perimeter
(B) Wetted perimeter and diameter of pipe
(C) Velocity of flow and area of flow
(D) None of these
Answer: (A) Area of flow and wetted perimeter
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