NEET

The constant velocity attained by a body while falling through a viscous medium is termed as

critical velocity
terminal velocity
threshold velocity
None of these

The difference between viscosity and solid friction is/are

viscosity depends on area while solid friction does not
viscosity depends on nature of material but solid friction does not
both (a) and (b)
neither (a) nor (b)

Water is not used in the rmometer because

it sticks to glass
its shows anamalous expansion
both (a) and (b)
neither (a) nor (b)

Toricelli’s theorem is used to find

the velocity of efflux through an orifice.
the velocity offlow of liquid through a pipe.
terminal velocity
critical velocity

Gases do not posses

density
surface tension
volume
viscosity

Paint-gun is based on

Bernoulli’s theorem
Archimedes’ principle
Boyle’s law
Pascal’s law

Water is flowing through a horizontal pipe having are striction, then

pressure will be greater at the restriction.
pressure will be greater in the wider portion.
pressure will be same through out the length of the pipe.
None of these

Fevicol is added to paint to be painted on the walls, because

it increases adhesive force between paint and wall.
it decreases adhesive force between paint and wall molecules.
it decreases cohesive force between paint molecules.
None of these

The reading of spring balance when a block is suspended from it in air is 60 newton. This reading is changed to 40 newton when the block is submerged in water. The specific gravity of the block must be therefore

Solution

Specific gravity of block=\(\frac{weight\: of\: block\: in\: air}{loss\: of\: weight\: in\: water}\)

A boat having a length of 3 metres and breadth 2 metres is floating on a lake. The boat sinks by one cm when a mangets on it. The mass of the man is

60 kg
62 kg
72 kg
128 kg

Solution

Weight of a man = wt. of water displaced

= volume × density =3×2×\(\frac{1}{100}\times 10^{3}=60\: kg\)

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