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Physics > Heat > Flashcards

Heat Flashcards

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1
Q

____ is the property of a body that’ll determine the which heat will flow

A

Temperature

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2
Q

Heat flows from body at _____ to a body at _____

A

Higher to lower

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3
Q

When a body absorbs heat without changing its state its temp

A

Rises

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4
Q

Heat depends on the

A

Mass of the body and the temperature

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5
Q

Heat is a measure of

A

Total internal energy

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6
Q

The measure of the average kinetic energy is

A

Temperature

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7
Q

A thermometer that notices heat change with potential difference is

A

Thermocouple

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8
Q

The response of the human sense of touch is influenced by its

A

Previous experience

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9
Q

The standard atmospheric pressure is

A

760mm of mercury

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10
Q

The difference between two temperature points is the

A

Fundamental interval

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11
Q

The upper and lower fixed point of a farenheight scale

A

212•C and 32•C

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12
Q

The temperature tagged as absolute zero is

A

-273•C and 0K

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13
Q

The upper fixed point of an unmarked thermometer can be determined with an

A

Hypsonometer

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14
Q

The 2 instruments used to determine the upper fixed point is the

A

Manometer and hyspometer

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15
Q

The jonb of the manometer is

A

To keep the atmospheric pressure within 760

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16
Q

An important precaution to know when getting the lower fixed point is that

A

The thermometer doesn’t come in contact with the boiling water

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17
Q

The most common thermometers are the

A

Mercury and Alchohol

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18
Q

The liquid in glass thermometer measures

A

Change in volume of a fixed mass of liquid

19
Q

For sensitivity a liquid in glass thermometer should have

A

A bulb made of thin glass,narrow capillary tube, A liquid with high expansivity

20
Q

A liquid with good expansivity should

A

Increase uniformly with change in temp
ii.Have high boiling point and low boiling point
iii.be easily seen in glass

21
Q

The disadvantage ofusing mercury in glass thermometer is the

A

Unreliability of its accuracy

22
Q

The main advantage of Mercury over Alchohol is its

A

High conductivity,High boiling point(357•C)it doesn’t wet glass

23
Q

The Advantage of Alchohol over mercury is

A

High freezing point,Better expansivity(6x)

24
Q

The most prominent feature of the thermometer is the

A

Kink or constriction

25
Q

The kink allows

A

The expanding Mercury to flow past it

26
Q

Its advisable not to sterilize the equipment because the

A

Thermometer has a small temperature range which doesn’t extend up to 100•C it will break

27
Q

The thermometer mainly used by weather men in meterological stations is

A

The sixes combined minumum and maximum thermometer invented by james sic

28
Q

The combined maximum and minimum temperature makes used of 2 materials namely

A

Alcohol and Mercury

29
Q

The materials mainly heated in a thermocouple is

A

Copper and constantan

30
Q

The galvanometer is usually used to

A

Determine the size of current by galvanometer

31
Q

The heat of the solid can be determined by the

A

Electrical method

32
Q

Heat lost by substance is reduced by

A

Polishing the outside of the calorimeter

33
Q

Calorimeter is an apparatus used

A

In experiments between bodies at different temps

34
Q

Factors affecting evaporation

A

Temp,Wind and dryness of the air,Pressure,Nature of the liquid,Area of liquid exposed

35
Q

2 liquids 35•C and 100•C BP which one will evaporate first

A

The one with. 35•C

36
Q

The main diff between Evap and boiling is

A

Evap occurs at the top,Boil occurs throughout the entire volume

37
Q

The presence of impurities ____ the boiling point but _____the freezing point

A

Raise and lowers

38
Q

Substances that can go from solids to vapour without passing through melting are

A

Dry ice,iodine,(they undergo sublimation)

39
Q

s.v.p increases with

A

Temperature

40
Q

The boiling point of a liquid is said to occur when the

A

Svp =Equal to the atmospheric pressure

41
Q

Relative humidity is

A

The mass ratio of waterr vapour presenf in the air to the ratio required to saturate it

42
Q

The air conditioner not only cools the air but it also

A

Cleans filters and circulate air in a room

43
Q

Dew point is the temperature at which the

A

Water vapour in the air is just enough to saturate it

44
Q

Dee point depends on prevalent atmospheric conditions like

A

Temp,Wind and amount of water vapour

Physics (17 decks)

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