Q.1
Mercury does not wet glass. This is due to property of liquid known as
Q.2
For pipes, turbulent flow occurs when Reynolds number is
Q.3
Centre of buoyancy always
Q.4
Choose the wrong statement
Q.5
Due to each end contraction, the discharge of rectangular sharp crested weir is reduced by
Q.6
The process of diffusion of one liquid into the other through a semi-permeable membrane is called
Q.7
The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is (Assume that boundary layer is entirely laminar)
Q.8
Surge wave in a rectangular channel is an example of
i) steady flow
ii) unsteady flow
iii) uniform flow
iv) non-uniform flow
The correct answer is
Q.9
The center of gravity of the volume of the liquid displaced by an immersed body is called
Q.10
The center of gravity of the volume of the liquid displaced by an immersed body is called
Q.11
If a vessel containing liquid moves downward with a constant acceleration equal to ‘g’ then
Q.12
In an immersed body, center of pressure is
Q.13
In an isothermal atmosphere, the pressure
Q.14
Coefficient of velocity for Borda’s mouth piece running full is
Q.15
Which of the following is used to measure the discharge ?
Q.16
Rotameter is a device used to measure
Q.17
A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?
Q.18
A fluid is said to be ideal, if it is
Q.19
Choose the wrong statement
Q.20
For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is
Q.21
The flow which neglects changes in a transverse direction is known as
Q.22
The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the sub-merged body is called
Q.23
Flow at constant rate through a tapering pipe is
i) steady flow
ii) uniform flow
iii) unsteady flow
iv) non-uniform flow
The correct answer is
Q.24
Drag force is a function of
i) projected area of the body
ii) mass density of the fluid
iii) velocity of the body
The correct answer is
Q.25
A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ?
Q.26
For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be
Q.27
Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the
Q.28
Rain drops are spherical because of
Q.29
To avoid an interruption in the flow of a syphon, an air vessel is provided
Q.30
Choose the wrong statement
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