# FLUID MECHANICS AND HYDRAULICS MCQ PART 3- IES, RRB, GATE AND PSC

## FLUID MECHANICS AND HYDRAULICS MCQ PART 3 Questions

Question No. 1
A one dimensional flow is one which
(A) Is uniform flow
(C) Takes place in straight lines
(D) Involves zero transverse component of flow

Question No. 2
An opening in the side of a tank or vessel such that the liquid surface with the tank is below the top edge of the opening, is called
(A) Weir
(B) Notch
(C) Orifice
(D) None of these

Question No. 3
The property of fluid by virtue of which it offers resistance to shear is called
(A) Surface tension
(C) Cohesion
(D) Viscosity

Question No. 4
Coefficient of velocity is defined as the ratio of
(A) Actual velocity of jet at vena contracta to the theoretical velocity
(B) Area of jet at vena contracta to the area of orifice
(C) Actual discharge through an orifice to the theoretical discharge
(D) None of the above

Question No. 5
The mass of 2.5 m3
of a certain liquid is 2 tonnes. Its mass density is
(A) 200 kg/m3
(B) 400 kg/m3
(C) 600 kg/m3
(D) 800 kg/m3

Question No. 6
A fluid in equilibrium can’t sustain
(A) Tensile stress
(B) Compressive stress
(C) Shear stress
(D) Bending stress

Question No. 7
When a plate is immersed in a liquid parallel to the flow, it will be subjected to a pressure __________ that if the same plate is immersed perpendicular to the flow.
(A) Less than
(B) More than
(C) Equal to
(D) None of these

Question No. 8
An object having 10 kg mass weighs 9.81 kg on a spring balance. The value of ‘g’ at this place is
(A) 10 m/sec²
(B) 9.81 m/sec²
(C) 9.75 m/sec²
(D) 9 m/sec

Question No. 9
A flow is called hyper-sonic, if the Mach number is
(A) Less than unity
(B) Unity
(C) Between 1 and 6
(D) None of these

Question No. 10
Liquids
(A) Cannot be compressed
(B) Occupy definite volume
(C) Are not affected by change in pressure and temperature
(D) None of the above

## FLUID MECHANICS AND HYDRAULICS MCQ PART 3 Answers

Question No 1:  D

Question No 2:  B

Question No 3:  D

Question No 4:  A

Question No 5:  D

Question No 6:  C

Question No 7:  A

Question No 8:  A

Question No 9:  D

Question No 10: D

Read More: Fluid mechanics MCQ PART 1

Read More: Fluid Mechanics MCQ PART 2

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