Question # 1

The resistance offered by a fluid to a solid moving inside it is called:

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Drag force

Surface force

Viscosity

None of these

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

Unit of viscosity is:

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Kg m^-1sec^-1

N s m^-2

J s m^-3

All 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

At the starting point of the free fall motion of an object, its acceleration will be

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maximum

minimum

zero

none of them

The body will move with terminal velocity when it acquires

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minimum speed

zero speed

maximum speed

none of them

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

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

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

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turbulent

streamline

either or them

neither of them

Blood vessels can be stretch like rubber, therefore they are

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rigid

hard

very thick

not rigid

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

A device used to measure the speed of liquid flow is known as

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barometer

speedometer

sphygmomanometer

venture-meter

The instrument which detects the instant at which external pressure becomes equal to the systolic pressure is

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stethoscope

thermometer

manometer

barometer

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

Blood has a density

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Equal to water

Greater then water

Lesser then water

None of these

Stock's law holds for:

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Motion through free space

Motion through viscous medium

Bodies of all shapes

None of these

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