Question # 1

A body is floating in a liquid. The up thrust on the body is

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Equal to weight of liquid displaced

Zero

Less than the weight of liquid displaced

Weight of body-weight of liquid displaced

The rain drop falling from the sky reach the ground with

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Constant terminal velocity

Constant gravitational acceleration

Variable acceleration

acceleration greater than g

Stock's law holds for:

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Motion through free space

Motion through viscous medium

Bodies of all shapes

None of these

The smooth or steady stream-line flow is know as

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Laminar flow

Turbulent flow

Both a and b

None of the above

With increase of temperature, the viscosity of liquid and gases

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Increases for both

Decreases for both

Increases for liquids and decreases for gases

Decreases for liquids and increases for gases

When there is no internal frictional forces between the adjacent layers of fluid, then the fluid is called

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incompressible

compressible

viscous

non viscous

Which of the following options states the names of fluids in the order of increasing viscosity?

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mercury, motor oil, methanol

methanol, mercury, motor oil

motor oil, mercury, methanol

methanol, motor oil, mercury

The direction of the streamlines is the same as the direction of the

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force

torque

velocity

weight

The pressure will change in the pipe, as the fluid moves through that pipe of varying

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cross-section

height

none of them

both of them

When a fluid is in motion, its flow can be considered as

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turbulent

streamline

either or them

neither of them

How much force is required to slide one layer of the liquid over the other layer is measured by

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friction

density

viscosity

resistivity

The drag force acting on a spherical droplet of radius 10^-5m moving with a velocity of 1 cm/sec in a fluid of velocity 5.31 x 10^-7m/sec. The units comes out to be:

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10^-16N

10^-14N

10^-12N

10^-10N

According to the Bernoulli's equation, where the speed of the fluid is high, the pressure will be

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low

zero

high

all of them

The fluid is incompressible, if itsdensity is

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zero

constant

very high

very small

The terminal velocity of water droplet of radius 1 x 10^-4m and desity 1000 kg m^-3descending through air of viscosity 19 x 10^-6kg. m^-1s^-1is

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2.5 ms^-1

3.2 ms^-1

4.3 ms^-1

1.1 ms^-1

If one of the pipes has a much smaller diameter than the other and are placed horizontally then form both sides of Bernoulli's equation, we can drop the term

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P

1/2 fv²

pgh

none of them

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