## hydraulics and fluid mechanics

###### One litre of water occupies a volume of
 A 100 cm3 B 250 cm3 C 500 cm3 D 1000 cm3
 ANS: D - 1000 cm3

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###### The value of bulk modulus of a fluid is required to determine
 A Reynold's number B Froude's numbe C Mach number D Euler's number
 ANS: C - Mach number

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###### In a depressed nappe
 A the pressure below the nappe is atmospheric B the pressure below the nappe is negative C the pressure above the nappe is atmospheric D the pressure above the nappe is negative
 ANS: D - the pressure above the nappe is negative

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###### In one dimensional flow, the flow
 A is steady and uniform B takes place in straight line C takes place in curve D takes place in one direction
 ANS: B - takes place in straight line

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###### The kinematic viscosity is the
 A ratio of absolute viscosity to the density of the liquid B ratio of density of the liquid to the absolute viscosity C product of absolute viscosity and density of the liquid D product of absolute viscosity and mass of the liquid
 ANS: A - ratio of absolute viscosity to the density of the liquid

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###### The discharge over a right angled notch is (where H = Height of liquid above the apex of notch)
 A Cd√ 2g x H B Cd√ 2g x H3/2 C Cd√ 2g x H2 D Cd√ 2g x H5/2
 ANS: D - Cd√ 2g x H5/2

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###### A weir is said to be broad crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.
 A equal to. B less than C more than
 ANS: C - more than

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###### A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall per unit length is (where w = Specific weight of liquid, and H = Height of liquid)
 A wH B wH/2 C wH2/2 D wH2/3
 ANS: D - wH2/3

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###### 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%
 ANS: D - 2.5%

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###### 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 actual discharge through an orifice to the theoretical discharge D area of jet at vena contracta to the area of orifice
 ANS: D - area of jet at vena contracta to the area of orifice

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