9th Standard Syllabus & Materials
9th Standard
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NEW9th Standard
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NEW9th Standard
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NEW9th Standard
TN 9роЖроорпН ро╡роХрпБрокрпНрокрпБ роЪроорпВроХ роЕро▒ро┐ро╡ро┐ропро▓рпН ро╡ро░ро▓ро╛ро▒рпБ - родрпКроЯроХрпНроХроХро╛ро▓родрпН родрооро┐ро┤рпНроЪрпН роЪроорпВроХроорпБроорпН рокрогрпНрокро╛роЯрпБроорпНроорпБроХрпНроХро┐ропрооро╛рой 2,3,&5 роородро┐рокрпНрокрпЖрогрпН ро╡ро┐ройро╛роХрпНроХро│рпН ро╡ро┐роЯрпИроХро│рпБроЯройрпН TN 9th Social Science HIS - Early Tamil Society and Culture Important 1 Mark Questions with Answers 2,3,&5 Marks Questions with Answers.
NEW9th Standard
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NEW9th Standard
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Published on: 06/09/2019
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.
Define thermal capacity.
2.
What is specific heat capacity?
3.
How can you experimentally prove that water is a bad conductor of heat? How is it possible to heat water easily while cooking.
4.
Explain convection in daily life.
5.
How much heat energy is required to change 2 kg of ice at 0ºC into water at 20ºC? (Specific latent heat of fusion of water = 3,34,000J/kg, Specific heat capacity of water = 4200JKg-1K-1).
6.
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)
7.
A device in which the loss of heat due to conduction, convection and radiation is minimized in
Solar cell
Solar cooker
Thermometer
Thermos flask
8.
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
9.
Calorie is the unit of
heat
work
temperature
food
10.
The fixed temperature at which matter changes state from solid to liquid is called ___________.
11.
Liquids and gases are generally _________ conductors of heat.
12.
During day time, air blows from________________to_____________
13.
The fastest mode of heat transfer is ___________.
1.
Heat capacity or thermal capacity is defined as the amount of heat energy required to raise the temperature of a body by 1°C.
2.
Specific heat capacity of a substance is defined as the amount of heat required to raise the temperature of 1 kg of the substance by 1oC.
3.
Water has the highest specific heat capacity. So water absorbs a large amount of heat for unit rise in temperature. Thus water is used as a coolant in car radiators and factories to keep engine and other machinery parts cool. So water is a bad conductor of heat. Specific heat capacity of water is 4200J/kgoC. So it is easy to raise the temperature. So it is possible to heat water easily while cooking.
4.
Hot air balloons:
Air molecules at the bottom of the balloon get heated by a heat source and rise. As the warm air rises, cold air is pushed downward and it is also heated. When the hot air is trapped inside the balloon, it rises.
Breezes:
During day time, the air in contact with the land becomes hot and rises. Now the cool air over the surface of the sea replaces it. It is called sea breeze. During night time, air above the sea is warmer. As the warmer air over the surface of the sea rises, cooler air above the land moves towards the sea. It is called land breeze.
Winds:
Air flows from area of high pressure to area of low pressure. The warm air molecules over hot surface rise and create low pressure. So, cooler air with high pressure flows towards low pressure area. This causes wind flow.
Chimneys:
Tall chimneys are kept in kitchen and industrial furnaces. As the hot gases and smoke are lighter, they rise up in the atmosphere.
5.
Mass (m) = 2 kg
Specific heat capacity (c) = 4200 Jkg-1 K-1
Temperature variation (\(\triangle \)t) = 20oC -0oC = 20oC
Specific latent heat (L) = 3,34,000 J/kg
Heat energy required = mc\(\triangle \)t + ml
= (2 x 4200 x 20) + (2 x 3, 34,000)
= 168000 + 668000
= 836000 J
6.
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
7.
(d)
Thermos flask
8.
(b)
Conduction
9.
(a)
heat
10.
( )
Latent heat
11.
( )
good
12.
( )
sea to land
13.
( )
radiation
9th Standard Syllabus & Materials
9th Standard
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NEW9th 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
