Question # 1

Drag force increases if speed of the object moving through the fluid:

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Increases

Decreases

Remains constant

None of these

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

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Zero

High

Low

Constant

The _____ viscous the medium is _____, is the value of terminal velocity of the droplet:

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More, lesser

Lesser, more

Both A and B

Lesser, lesser

The un-steady streamline flow is called

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laminar flow

turbulent flow

both of them

none of them

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

Fog droplets are suspended in air when their weight is balanced by:

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Force of gravity

Upward trust due to air

Surface tension

None of these

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

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

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

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

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low

zero

high

all of them

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

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

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very high

very low

constant

zero

With the increase of temperature viscosity

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Increase

Decrease

Remains same

Doubles

The value for systolic blood pressure for a normal healthy person is

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140 torr

80 torr

90 torr

120 torr

Terminal velocity is the maximum velocity attained by a spherical droplet when the drag force______the weight of droplet:

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Is smaller than

Is greater than

Becomes equal to

None of these

Bernoulli's equation is based upon law of conversation

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Mass

Momentum

Energy

None of these

Two copper balls of 1 cm and 2 cm in diameter are simultaneously dropped in the same viscous medium. The terminal velocity of bigger ball is:

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Not affected due to its size

Twice that of small size ball

Four times that of small size ball

1/4th of that of small size ball

Fluids resist force, This property is called

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Stiffness

Strength

Ductility

Elasticity

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 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

Ball pen functions on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tnesion

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 smooth or steady streamline flow is known as

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laminar flow

turbulent flow

both of them

none of them

If the flow is incompressible and the flow is steady then the mass of the fluid through the pipe

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increases

decreases

becomes zero

is conserved

0.10 cm can be written as:

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1.0 x 10^-2m

1.0 x 10^-3cm

1.0 x 10^-4cm

1. x 10^-4m

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

The blood pressure of a person

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decrease with age

increase with age

has no effect with age

none 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

A high concentration of red blood cells increases its viscosity from

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3 - 5 times that of mercury

5 - 8 times that of mercury

3 - 5 times that of water

5 - 8 times that of water

The effect of friction between different layers of a flowing fluid is described in terms of

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motion of fluid

nature of fluid

colour of fluid

viscosity of fluid

N s m^-2is unit of:

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Drag force

Pressure

Surface tension

Coefficient of viscosity

Blood has a density

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Equal to water

Greater then water

Lesser then water

None of these

Internal friction of fluid is called

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Surface tension

Viscosity

Resistance

Cohesive force

The application of Bernoulli's equation is

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Torricelli's theorem

Venture relation

Binomial theorem

Both a and b

The analysis of fluid motion becomes simplified by using

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law of conservation

law of conservation of energy

both of them

none of them

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