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9th Science > Heat > Flashcards

Heat Flashcards

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1
Q

Effects of heat

A

Expansion
Change in state
Change in temperature
Chemical changes

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2
Q

We wear woolen clothes in winter to keep ourself warm

A

Air, Which is the bad conductor does not allow our body heat to escape

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3
Q

Mercurys used in thermometer

A

Is a good conductor of heat

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4
Q

The process of transfer of heat in solids from origin of higher temperature to region lower temperature without the actual moment of molecules called

A

Conduction

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5
Q

The flow of heat through a fluid from places of higher temperature to place of lower temperature by a movement of fluid itself

A

Convection

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6
Q

Examples of convention in daily life

A

1 Hot air balloon
2 breeze (land breeze and sea breeze)
3 wind
4 chimney

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7
Q

Radiation is the flow of heat from one place to another by means of _______

A

Electromagnetic waves

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8
Q

Radiation is limited by all bodies above

A

0K

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9
Q

We can observe all the 3 ways of heat transfer

A

Wiring wood

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10
Q

White or light coloured crackers are good reflector of heat

A

They keep us cool during summer

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11
Q

Base of cooking utensils is blackened

A

Because black surface observe more heat from the surroundings

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12
Q

Surface of airplanes highly polished

A

Because it help to reflect most of the heat radiation from the Sun

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13
Q

_____ is there degree of hotness or coldness of the body

A

Temperature

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14
Q

Kelvin scale is also known as

A

Absolute scale

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15
Q

Fahrenheit scale

A

32-212°F

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16
Q

Celsius scale

A

0-100°C

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17
Q

Formula for convertian Celsius scale to fahrenheit scale

A

F=9/5C+32
C=5/9(F-32)

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18
Q

Temperature at which is the molecules of a substance have thier lowest possible energy

A

0K

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19
Q

SI unit of temperature

A

Kelvin

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20
Q

The solid liquid gases faces of water can co exist in equilibrium at

A

273.16K

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21
Q

Kelvin is defined as

A

1/273.16 of the triple point of temperature

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22
Q

If Fahrenheit scale is 0°F then Kelvin and Celsius scale will be

A

-18°C and 255K
Vice versa

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23
Q

If Fahrenheit scale is 32°F then Kelvin and Celsius scale will be

A

0°C and 273.15K

24
Q

If Fahrenheit scale is 212°F then Kelvin and Celsius scale will be

A

100°C and 373.15 K

25
Q

If Fahrenheit scale is -460°F then Kelvin and Celsius scale will be

A

-273°C and 0 K

26
Q

The temperature at which the pressure and volume of a gas theoretically reaches 0 is called

A

Absolute zero
For all gases the pressure extrapolates to zero at the temperature -273.15°C. it is known as absolute zero or 0 K

27
Q

Temperature of boiling point of water

A

373.15 K
100°C
212°F

28
Q

Temperature of melting point of ice

A

273.15 K
0°C
32°F

29
Q

Absolute zero

A

0 K
-273 °C
-460 ° F

30
Q

Convert celcius to kelvin

A

K= C + 273.15

31
Q

The amount of heat energy observed or lost by a body is determined by 3 factor

A

1 Mass of the body
2 change in temperature of the body 3 natural the material of the body

32
Q

Formulas specific heat capacity

A

C. = Q
————
m ∆T
T change in temperature
M mass of the body
Q quantity of heat obsorbed

33
Q

The SI unit of specific heat capacity

A

J kg^-1 K^-1

34
Q

The amount of heat required to the raise the temperature of 1 kg of the substance by 1 degree Celsius or 1K

A

Specific heat capacity

35
Q

________ has the highest specific heat capacity and its values ______

A

Water
4200 J/kg K

36
Q

Water absorbs large amount of heat for unit raise in temperature

A

Water is used as a coolant in car radiators and factories to keep engine and other machinery parts cool

37
Q

Water in its various form as different specific heat capacity

A

Water 4200 J/ (kg K)

ice. 2100 J /(kg K)

stream. 460 J/(kg K)

38
Q

Heat capacity or thermal capacity

A

Is defined as the amount of heat energy required to raise the temperature of body by 1 degree Celsius

C’ =Q/T

39
Q

S.I unit of heat capacity

A

J/K

40
Q

The case of water melting and boiling occurred at

A

0°C

41
Q

The process in which year solid is converted to liquid by obsorbing heat is called

A

Melting or fusion

42
Q

Boiling point as well as condensation point of water is

A

100°C

43
Q

The process in which a solid is converted to gas state is called

A

Sublimation

44
Q

The amount of heat energy observed or released by a substance during a change in its physical States without any change in its temperature

A

Latent heat

45
Q

Latent heat of fusion

A

heat energy is absorbed by the solid during melting and an amount of heat energy is liberated by the liquid from during freezing without any temperature change

46
Q

Latent heat of vaporization

A

Heat energy is observed by a liquid during vaporization and equal amount of heat energy is liberated by the vapour during condensation without any temperature change

47
Q

Specific latent heat

A

Amount of heat energy observed or liberated by unit mass of a substance during change of state without causing any change in temperature

L=Q /m

48
Q

SI unit of specific latent heat is

A

J/kg

49
Q

Convection take place in _______ and conduction take place in _______

A

Liquid and gas
Solid

50
Q

Calories the unit of

A

Heat

51
Q

Two cylindrical rod of same length how the area of cross section in the ratio 2:1 if both the material made up of same material which of them conduct heat faster
a) both rod b) rod 2
c) rod 1. d) none

A

Rod 1

52
Q

Your device in which season loss of heat due to conduction convection and radiation is minimised is

A

Thermos flask

53
Q

The fastest mode of heat transfer is

A

Radiation

54
Q

Liquid and gases are generally _____ conductor of heat

A

Poor

55
Q

The fixed temperature at which matter changes state from solid to liquid is called

A

Melting point

9th Science (19 decks)

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