9th Standard Syllabus & Materials
9th Standard
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NEW9th Standard
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Published on: 20/08/2019
Heat
Download Tamil Nadu 9th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
Calculate the amount of heat required to convert 200g of ice at 00C into water at 00C Specific latent heat of fusion of ice = 336 Jg-1
2.
What is the amount of heat required to raise the temperature of 5 kg of iron from 30°C to 130°C? Specific heat capacity of iron = 483 Jkg-1C-1.
3.
Why are burns caused by steam more painful than those caused by boiling water at the same temperature?
4.
Define conduction.
5.
What is the minimum possible temperature? Is there also a maximum possible temperature?
6.
What is the relation between calorie and Joule?
7.
Define one calorie.
8.
Heat gained by a body depends upon which factors?
9.
What is the heat in joules required to raise the temperature of 25 grams of water from 0ºC to 100ºC? What is the heat in Calories?
(Specific heat of water = 4.18 J/gºC)
10.
Which one of the following scales has lower fixed point at 0°C?
Kelvin scale
Fahrenheit scale
Celsius scale
All of these
11.
The temperature at which a liquid gets converted into its vapour state is called its________
melting point
boiling point
dew point
freezing point
12.
In which mode of transfer of heat, molecules pass on heat energy to neighbouring molecules without actually moving from their positions?
Radiation
Conduction
Convection
Both B and C
13.
Two cylinders of equal height and radius are made of copper and aluminium. Which of them conducts heat faster?
Copper rod
Aluminium rod
Both of them
None of them
14.
Calorie is the unit of
heat
work
temperature
food
15.
When heat energy is added to a substance, the kinetic energy of its particles _________ and so the particles move at higher speed.
16.
______________is greater for liquids than for solids and maximum in case of gases.
17.
Liquids and gases are generally _________ conductors of heat.
18.
During day time, air blows from________________to_____________
19.
The fastest mode of heat transfer is ___________.
20.
Specific heat capacity of water
21.
J / Kg
22.
m x s x t
23.
m x L
24.
Heat
25.
Give some practical applications of specific latent heat of ice.
26.
Give the difference between heat and temperature.
1.
Mass of ice m = 200 g
Specific latent heat of fusion of ice L = 336 Jg-1
Heat required Q = m L
= 200 x 336
Q = 67,200 J
2.
Mass of iron m = 5 kg
Initial temperature t1 = 30°C
Final temperature t2 = 130°C
Rise is temperature \(\triangle \)t2 = (t2 - t1) = 130 - 30 = 100°C
Specific heat capacity of iron c = 483 Jkg-10C-1
Q = m x c x \(\triangle \)t
= 5 x 483 x 100
= 2,41,500 J
3.
(i) When steam hits our skin, it condenses to water and then cools down to the temperature of skin.
(ii) Now, the energy released will be due to latent heat and fall in temperature.
(iii) Whereas when boiling water hits our skin, there is no phase transition but only fall in temperature and the heat transferred to skin will be only due to cooling.
(iv) Also, the loss of energy that is released from steam hitting our skin occurs quickly and in a small localized area, therefore causing damage to our cells.
4.
The process of transfer of heat in solids from a region of higher temperature to a region of lower temperature without the actual movement of molecules is called conduction.
5.
The minimum possible temperature is 0K. There is no limit to maximum temperature.
6.
1 Calorie = 4.186 J
= 4.2 J
7.
The amount of heat energy required to raise the temperature of 1 g water by 10C is called one calorie.
8.
1. Mass of the body
2. Change in temperature of the body
3. Nature of the material of the body.
9.
Mass of water = 25 grams
\(\triangle\)T = (100oC - 0oC) =100oC
C = 4.18 J/goC
Heat energy required Q = M x C x \(\triangle\)T
= 25 x 4.18 x 100oC
= 10450 j
10.
(c)
Celsius scale
11.
(b)
boiling point
12.
(b)
Conduction
13.
(a)
Copper rod
14.
(a)
heat
15.
( )
increase
16.
( )
Expansion
17.
( )
good
18.
( )
sea to land
19.
( )
radiation
20.
4.2 J/g0C
21.
SI unit of specific latent heat
22.
Heat gained or lost when there is no change of state
23.
Heat gained or lost in change of state without any change in temperature
24.
Form of energy
25.
Specific latent heat of ice is very high (i.e.) 336 J/g.
1. Due to high specific latent heat of ice, snow on mountains do not melt as a whole, but melts gradually into water with the heat of the sun. If the specific latent heat of ice would not have been so high, all the snow would have melted very quickly and there would have been floods in the rivers.
2. All the water in lakes and ponds in cold places do not freeze all at the same time. If freezes slowly and keeps the surrounding moderate.
3. Drinks are cooled more effectively by ice pieces at 00C and not by water at 00C. This is because 1 g of ice takes away 336 J of heat from the drink to melt into water at 00C.
26.
| Heat | Temperature | |
| 1. | Heat is a form of energy due to which we feel hot or cold. | The degree of hotness or coldness of a body is known as temperature |
| 2. | It's SI unit is joule (J) | Its SI unit is kelvin (K). |
| 3. | It depends upon mass, nature and temperature of the body. | It does not depend upon mass, nature and temperature of the body. |
| 4. | It is a form of energy. | It is a condition which determines the direction of flow of heat. |
| 5. | It is measured by a calorimeter. | It is measured by a thermometer. |
9th Standard Syllabus & Materials
9th Standard
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NEW9th Standard
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NEW9th Standard
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Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards
