Question # 1

When the speed of a body in a fluid increases then the drag force

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decreases

becomes zero

increases

non of them

According to the Bernoulli's theorem the pressure velocity are

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equal to each other

proportional to each other

inversely proportional to each other

none of them

The irregular and unsteady flow of the fluid is called

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turbulent flow

steady flow

either of them

both of them

When a water droplet falls through air, the net force on it is

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Net force = drag force - weight

Net force = weight - drag force

Net force = drag force + weight

Net force = weight + drag force

A fluid at a certain point has 50 J of potential energy per unit volume, 75 J of kinetic energy per unit volume,and 35 J of pressure energy per unit volume. the total energy of the fluid is

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125 J

90 J

160 J

85 J

In a normal healthy person the value of systolic pressure is

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75 torr

80 torr

120 torr

all of them

In a container having water filled up to a height h, a hole is made in the bottom. The velocity of water flowing out of the hole is

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Independent of h

Proportional to h^1/2

Proportional to h

Proportional to h²

The maximum drag force on a falling sphere is 9.8 N, it weight is

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1 N

9.8 N

4.9 N

Cannot be calculated

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

The SI unit of viscosity is

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kg m^-1s^-1

kg ms^-1

kg m^-1s^-2

kg m^-1s

Ball pen functions on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tnesion

The dimensions of viscosity are:

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M²L^-1T^-2

M^-1L¹T^-1

M^-1L^-1T

ML^-1T^-1

Two water pipes of diameters 4 cm and 8 cm are connected with a supply line. The velocity of flow of water in the pipe 4 cm diameter is

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1/4 times

4 times

Twice

1/2 of 8 cm diameter pipe

Which of the following options correctly states the equation of continuity for an ideal fluid?

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A₁A₂= V₁V₂

A₁/A₂= V₂/V₁

A₁/A₂= V₁/V₂

none of the above

Matter is made up of very tiny particles called

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Atoms

Molecules

Ions

None of these

The unit of viscosity is SI system is:

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Kg^-1m sec^-1

Kgm^-1 sec^-1

Kg^-1m^-1 sec

None of these

The velocity of falling raindrops attains limited value because of

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Up thrust of air

Air currents of the earth atmosphere

Surface tension effect

Viscous force exerted by air

According to the equation of continuity, when water falls from the tap, it's speed increases and its cross-sectional area

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decreases

increases

becomes zero

none of them

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

In case of streamed lined flow of liquid, the loss of energy is

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Maximum

Minimum

Infinite

equal to what is in turbulent flow

High speed meteors rushing through air reduces to ashes because of:

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Force of gravity

High resistance of air

Drag force

None of these

The equation of continuity

A₁V₁= A₂V₂is for the flow of

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an ideal fluid

an incompressible fluid

a non visconcous fluid

all of the above

Substances that flow easily have

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large coefficient of viscosity

small coefficient of viscosity

either of them

none of them

Bernoulli's equation is applicable for

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turbulent flow

streamline flow

both (a) and (b)

all kinds of flows

The application of Bernoulli's equation is

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Torricelli's theorem

Venture relation

Binomial theorem

Both a and b

The law of conservation of energy gives us

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equation of continuity

Bernoulli's theorem

both of them

none of them

The smooth or steady streamline flow is known as

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laminar flow

turbulent flow

both of them

none of them

A water hose with an internal diameter of 20 mm at the outlet discharges 30 kg of water in 60 s. What is water speed at the outlet if density of water is 1000 kg/m³during its steady flow

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1.3 m/s

1.6 m/s

1.9 m/s

2.2 m/s

If water rises 4 cm in a long, thin tube because of capillary action, then, under corresponding conditions of use, the rise (in the tube) of a liquid whose density is 2 g/cm²will be

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1 cm

2 cm

8 cm

None

The pressure will be low where the speed of the fluid is

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Zero

High

Low

Constant

When each particle of the fluid moves along a smoth path, this path is known as

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straight path

smooth path

haphazard path

steamline

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