650 Important Hydraulics And Fluid Mechanics MCQ Question and Answer | PDF Free Download
1.The point at which the resultant pressure on an immersed surface acts, is known as
- ACentre of gravity
- BCentre of depth
- CCentre of pressure
- DCentre of immersed surface
2.For a floating body to be in stable equilibrium, its metacentre should be
- ABelow the center of gravity
- BBelow the center of buoyancy
- CAbove the center of buoyancy
- DAbove the center of gravity
3.The force of buoyancy is always __________ the weight of the liquid displaced by the body.
- AEqual to
- BLess than
- CMore than
- DNone of these
4.The loss of head due to friction in a pipe of uniform diameter in which a viscous flow is taking place, is (where RN = Reynold number)
- A1/RN
- B4/RN
- C16/RN
- D64/RN
5.The diameter of the nozzle (d) for maximum transmission of power is given by (where D = Diameter of pipe, f = Darcy’s coefficient of friction for pipe, and l = Length of pipe)
- Ad = (D⁵/8fl)1/2
- Bd = (D⁵/8fl)1/3
- Cd = (D⁵/8fl)1/4
- Dd = (D⁵/8fl)1/5
7.Water is _________ liquid.
- AA compressible
- BAn incompressible
- CBoth A and B
- DNone of these
8.When a tube of smaller diameter is dipped in water, the water rises in the tube with an upward __________ surface.
- AConcave
- BConvex
- CPlane
- DNone of these
9.Flow of water in a pipe about 3 meters in diameter can be measured by
- AOrifice plate
- BVenturimeter
- CRotameter
- DPitot tube
10.Any change in load is adjusted by adjusting following parameter on turbine
- ANet head
- BAbsolute velocity
- CBlade velocity
- DFlow
11.The stability of a dam is checked for
- ATension at the base
- BOverturning of the wall or dam
- CSliding of the wall or dam
- DAll of these
12.The resultant of all normal pressures acts
- AAt C.G. of body
- BAt center of pressure
- CVertically upwards
- DAt metacentre
13.In one dimensional flow, the flow
- AIs steady and uniform
- BTakes place in straight line
- CTakes place in curve
- DTakes place in one direction
14.A flow in which the viscosity of fluid is dominating over the inertia force is called
- ASteady flow
- BUnsteady flow
- CLaminar flow
- DTurbulent flow
15.Free surface of a liquid tends to contract to the smallest possible area due to force of
- ASurface tension
- BViscosity
- CFriction
- DCohesion
16.In a depressed nappe
- AThe pressure below the nappe is atmospheric
- BThe pressure below the nappe is negative
- CThe pressure above the nappe is atmospheric
- DThe pressure above the nappe is negative
17.If 850 kg liquid occupies volume of one cubic meter, men 0.85 represents its
- ASpecific weight
- BSpecific mass
- CSpecific gravity
- DSpecific density
18.Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.?
- APelton wheel
- BFrancis turbine
- CKaplan turbine
- DNone of these
19.Fluid is a substance which offers no resistance to change of
- APressure
- BFlow
- CShape
- DVolume
20.A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will
- AIncrease
- BDecrease
- CRemain same
- DIncrease/decrease depending on depth of immersion