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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
The surface tension of mercury at normal temperature compared to that of water is

same
more or less depending on size of glass tube
more
less

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Hydraulics & Fluid Mechanics
The difference of pressure between the inside and outside of a liquid drop is

(b)p = T/r
p = T/2r
(a)p = Txr
(d)p = 2T/r

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Hydraulics & Fluid Mechanics
The density of water is 1000 kg/m3 at

0°K
20°C
0°C
4°C

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Hydraulics & Fluid Mechanics
Two pipe systems are said to be equivalent when

length and diameter are same in two systems
friction factor and length are same in two systems
head loss and discharge are same in two systems
length of pipe and discharge are same in two systems

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Hydraulics & Fluid Mechanics
Mercury is often used in barometer because

its vapour pressure is so low that it may be neglected
the height of barometer will be less
it is the best liquid
both (B) and (C)

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Hydraulics & Fluid Mechanics
If 850 kg liquid occupies volume of one cubic meter, men 0.85 represents its

specific gravity
specific weight
specific density
specific mass

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