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9th Science > Fluids > Flashcards

Fluids Flashcards

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1
Q

Force acting perpendicular to the surface is called

A

Thrust

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2
Q

The force or unit area acting on an object called

A

Pressure=
Thrust/area of contact
Si unit of thrust N
Si Unit of pressure. Pascal or
Pressure unit N/m^2

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3
Q

Pressure exerted by a liquid at a point is determined by

A

Depth
density of liquid
acceleration due to gravity

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4
Q

Pressure due to a liquid colum

A

¶hg

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5
Q

Mass of the liquid

A

Volume of liquid × density
¶v

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6
Q

The instrument used to measure atmospheric pressure is called

A

Barometer

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7
Q

The Mercury barometer first designed by an Italian physicist

A

Torricelli

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8
Q

On your typical day at sea level the height of Mercury column is

A

760 mm
76 cm

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9
Q

1atm=
1bar

A

1atm=1.01310^5 pa
1bar= 110^5pa
1atm=1.013 bar

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10
Q

On which one metre square of surface the force acting is

A

1.013 kN

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11
Q

1 absolute pressure is zero reference against
2 Gauge pressure is zero reference against

A

1 Perfect vacuum
2 atmospheric pressure

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12
Q

In petrol bunks the tyre pressure of vehicle is measured in a unit called

A

Pascal per inch ( psi)

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13
Q

The law state that external pressure applied on a in compressible liquid is transmitted uniformly throughout the liquid

A

Pascal’s law
Blaise Pascal
French
1623-1662

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14
Q

Pascal’s law became the basis for one of the important machines ever developed

A

Hydraulic press

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15
Q

The hydraulic system working in this way are known as

A

Force Multiplier

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16
Q

The SI unit of density is

A

Kilogram per metre cube

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17
Q

The density of substances is

A

Mass/volume of substances

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18
Q

Generally density of substance is compare with the density of water at 4 degree Celsius because density of water at this temperature is

A

1g/cm^3

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19
Q

Density of any other substance with respect to the density of water at 4 degree Celsius is called

A

Relative density
or specific gravity (if the referenced substances is water)

20
Q

The ratio of mass of a given volume of a substance to the mass of an equal volume of water at 4 degree Celsius denotes

A

Relative density
or specific gravity (if the referenced substances is water)

21
Q

Relative density can be measured using

A

Pycnometer or density bottle

22
Q

Density bottle can be used to measure

A

Relative density
or specific gravity (if the referenced substances is water)

23
Q

If the density of a substance is less than the density of liquid

A

It will float

24
Q

A direct reading instrument used for measuring the density are relative density of a liquid is called

A

Hydrometer

25
Q

Hydrometer is based on the principle of

A

Principal of flotation

The weight of a liquid displaced by the immersed portion of hydrometer is equal to weight of the hydrometer

26
Q

Hydrometer maybe calibrator for different uses such as

A

Lactometer
saccharometer
alcoholometers

27
Q

Density of milk is measured by
Density of sugar in a liquid measured by
Higher level of alcohol in spirits is measured by

A

Lactometer
Saccharometer
Alcoholometers

28
Q

Lactometer work on the principle of

A

Gravity of milk

29
Q

The pressure is more on the bottom less are the top of the liquid. This pressure difference causes a force on the object and pushes it upward. This course is called______&. Phenomenon is called_______

A

Buoyant force
Buoyancy

30
Q

Saltwater provides more Buoyant force than freshwater

A

Buoyant Force depends as much on the density of liquid as on the volume displaced

31
Q

_________is an instrument that demonstrate the principle of buoyancy

A

Cartesian driver

32
Q

Archimedes principle is the consequence of ________ law

A

Pascal

33
Q

Archimedes devised principles of the________ after he noticed his own apparent loss in weight while sitting in his bath

A

Hydrostatic balance

34
Q

Archimedes principle

A

State the body immersed in a fluid experiences vertical upward buoyant force equal to the weight of the fluid it displaces

35
Q

The correct lactometer reading is obtained only at the temperature of

A

60°F

36
Q

Law of flotation

A

The weight of your floating body in a fluid is equal to weight of the fluid displaced by the body
The centre of gravity of the floating body and the centre of buoyancy are in the same vertical line

37
Q

Flotation therapy uses water that contain Epson salt rich in

A

Magnesium
As a floater glasses relaxes he or she is obsorbing this magnesium through the skin. Magnesium body to process insulin which lower a person’s risk of developing type 2 diabetes

38
Q

Cartesian driver is an experiment which demonstrate the principle of

A

Buoyancy and ideal gas law

39
Q

Unit of relative density

A

No unit

40
Q

_____ is a device used to measure the relative density of liquid based on the Archimedes principle

A

Hydrometer

41
Q

lactometer Is a device used to check the purity of milk by measuring you its density using

A

Archimedes principle

42
Q

Clouds float in atmosphere because of the their

A

Low Density

43
Q

They drinking straw work on the existence of

A

Atmospheric pressure

44
Q

1gwt

A

980 dyne

45
Q

The frictional force exerted by fluids is also called .

A

drag

9th Science (19 decks)

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