Question # 1

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

The force exerted by the fluid in a hydraulic pump on the piston is 10 cm², the fluid pressure on the piston is, in N/cm²

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20

200

2000

20,000

Blood is an

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Compressible fluid

incompressible fluid

hard

none of them

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

The velocity of falling raindrop attains limited value because of

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Up trust of air

Viscous force exerted by air

Surface tension effect

Air currents atmosphere

Bernoulli's equation is based upon law of conservation

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Mass

Momentum

Energy

None of these

The density of water is 10³kg/m³. The water pressure on a submarine is 2.0 x 10⁷N/m². The depth of the submarine below the surface of the water, in maters, is approximately

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200 m

11000 m

2000 m

8000 m

Fluid A is more viscous than fluid B. While flowing through a pipe of the same dimensions and material which fluid takes longer to travel at 25°C?

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fluid B

fluid A

both take the same time

not possible to determine from given information

Where the streamlines are very close to each other, the pressure will be

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low

zero

high

all of them

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 velocity gained by the fluid in falling through the distance (h_{1 - h}_{2) under the action of gravity is equal to the speed of the action of gravity is equal to the speed of the}

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orifices

efflux

fluid

none 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

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 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

The law of conservation of mass gives us the

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equation of continuity

Bernoulli's theorem

both of them

none of them

In deriving the Bernoulli's equation, we assume that the fluid is

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incompressible

no viscous

flows in a steady manner

all of them

When the upward drag force of the fluid becomes equal to downward force of gravity of the droplet, then its velocity:

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Starts increasing

Starts decreasing

Becomes constant

Is called escape velocity

With the increase of temperature viscosity

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Increase

Decrease

Remains same

Doubles

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

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Zero

High

Low

Constant

Fire fighters have jet attached to the head of their water pipes in order to

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Increase the mass of water flowing per second

Increase the velocity of water flowing out

Increase the volume of water flowing per second

Avoid wastage of water

Internal friction of fluid is called

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Surface tension

Viscosity

Resistance

Cohesive force

In a _____ flow, each particle of the fluid is called a streamline and different streamlines ______cross each other.

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Streamline, cannot

Turbulent, cannot

Streamline, can

None of these

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

The product of cross-sectional area of the pipe and the fluid speed at any point along the pipe is called

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constant rate

volume rate

flow rate

steady rate

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

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

A person standing near the track of a fast moving train has tendency to fall towards it because of

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Vibration due to motion of train

Gravitation force of attraction between person and trains

The high speed of train

Some other effect

The smooth or steady streamline flow is known as

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laminar flow

turbulent flow

both of them

none of them

Where the streamlines are very far apart from each other, the pressure will be

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low

zero

high

all of them

One torr is equal to

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13.33 N/m²

760 N/m²

760 mm Hg

133.3 N/m²

When weight of an object falling freely becomes equal to the drag force, then the body will move with

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increasing speed

decreasing speed

constant speed

none of them

Under normal circumstances, the volume of blood is sufficient to keep the vessels

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flatted for all times

inflated for all times

inflated for small times

none of them

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

Fluid friction is _____ the friction between two solid surfaces:

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Greater than

Smaller than

Equal to

None of these

What is another name for laminar flow?

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streamline

unsteady flow

turbulent flow

both (a) and (b)

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