MCQ
761. The coefficient of discharge for an external mouth pices is
0.375
0.707
0.5
0.855
762. The centre of pressure acts.... the centre of gravity of immersed surface.
at
below
above
in
763. In an internal mouth piece, if the jet after contraction does not touch the sides of the mouth piece, then the mouth piece is said to be-
running full
running free
partially running full
partially running free
764. Reynold's number is the ratio the inertia force to the-
surcace tension force
viscous force
gravity force
elastic force
765. Law of intensity of pressure-
P=WH
P=mH
P=ωH
P=TH
766. The atmospheric pressure at sea level is-
1.03 kg/cm²
760mm of mercury
10.3m of water
all of these
767. The ratio of specific weight of a liquid to the specific weight of pure water at standard temperature called-
density of liquid
specific gravity of liquid
compressibility of liquid
surface tamsion of liquid
768. The mercury does not wet the grass. This is due to the property of the liquid known as--
cohesion
viscosity
adhesion
surface tension
769. Water is-Liquid.
a compressible
absolute pressure
an incompressible
None of these
770. Falling drops of water hecome spheners due to the property of--
surface tension of water
compressibility of water
capillarity of water
viscosity of water
771. Falling drops of water become sphere due to the property of water is called--
surface tension
capillarity
compressibility
viscosity
772. Which of the following is an extensive property?
Volume
Pressure
viscocity
All of the above
773. The pressure of a liquid measured with the help of piezometer tube-
vacuum pressure
gauge pressure
absolute pressure
atmoshperic pressure
774. The centre of gravity of the voulme of the liquid displaced is called-
centre of pressure
centre of buoyance
Meta centre
None of these
775. পড়ন্ত পানির ফোঁটা বর্তুলাকার ধারণ করে যে গুণের কারণে-
পৃষ্ঠটান
কৈশিকস্তা
সংকোচনশীলতা
ভিসকোসিটি
776. The pressure at any given point of a non-moving fluid is called the-
gauge pressure
atmospheric pressure
differential pressure
hydrostatic pressure
777. What is the viscosity of water at 30°C?
80.1
0.801
801
0.081
778. Which among these devices are the best suited for the measurement of high pressure liquids with high accoracy?
Dend weight gauge
Vacuum gauge
Manganin wire pressure
lonization gauge
779. The flow in a pipe is turbulent when Reynold number is-
Less than 2000
between 2000 and 2800
more than 2800
none of the above
780. An orifice is said to be large it-
the size of onetime is large
the velocity of flow is large
the available head of liquid is more than 5 times the height of orifice
the available head of liquid is less than 5 times the height orifice