9th Class English Medium Physics Chapter 9 Transfer of Heat Short Questions With Answers

9th Class Physics Chapter 9 Online Preparation

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Online Short Questions For Chapter 9 "9th Class Physics English Medium Chapter 9 Preparation "

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Physics (New Book) - 9th Class Physics English Medium Chapter 9 Preparation

Question # 1

What is meant by convection current

Ans 1: The path of flow of current which is used for the transfer of heat by actual movement of molecules for hot place to a cold place is known as convection current

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Prepare Complete Set Wise Questions For Chapter 9 "9th Class Physics English Medium Chapter 9 Preparation "

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Set 3

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Set 4

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Set 9

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9th Class Physics English Medium Chapter 9 Preparation - Set 1

Question # 1

What is meant by convection current

Ans 1: The path of flow of current which is used for the transfer of heat by actual movement of molecules for hot place to a cold place is known as convection current

Submit

9th Class Physics English Medium Chapter 9 Preparation - Set 2

Question # 1

Define convection current in air

Ans 1: Gases also expand on heating, thus convection currents are easily set up due to differences is the densities of air at various parts in atmosphere Or Transfer of heat by movement of heated partials into an area of cooler fluid

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9th Class Physics English Medium Chapter 9 Preparation - Set 3

Question # 1

How various surfaces can be compared by a Lessie cube

Ans 1: It is a metal box with four surfaces
A shining silvered surface, A dull black surface, A white surface, A coloured surface,
Hot water in filled in the Leslie cube
It is laced with its one end toward a radiation detector. It is found that dull black surface is a good emitter of heat

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9th Class Physics English Medium Chapter 9 Preparation - Set 4

Question # 1

Why metal are good conductors of heat?

Ans 1: Metals are good conductors of heat because they have free electrons. These free electrons move with very high velocities within the metals. They carry energy at a very fast rate from hot to cold parts of object.

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9th Class Physics English Medium Chapter 9 Preparation - Set 5

Question # 1

Why are the metals good conductors of heat

Ans 1: Metals are good conductors of heat because metal contains free electrons which can move from one place to another and transfer some energy by collision to neighboring atoms.

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9th Class Physics English Medium Chapter 9 Preparation - Set 6

Question # 1

How does heat reaches us from the sun

Ans 1: Our sun is the major source of heat energy It reaches us neither by conduction nor by convection because the space between the sun and the Earths atmosphere is travels from one place to another place It is through radiation that heat reaches us from the Sun.

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9th Class Physics English Medium Chapter 9 Preparation - Set 7

Question # 1

How heat energy from the sun reach to earth

Ans 1: Heat energy reaches us neither by conduction nor by convection, because the space between sun and the earth atmosphere is empty It is through radiation that heat reaches us from the sun

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9th Class Physics English Medium Chapter 9 Preparation - Set 8

Question # 1

Which measures are taken to save energy

Ans 1: Hot water tanks are insulted by plastic or foam lagging
Wall cavities are filled with plastic foam or wool
ceiling of room is covered by insulating materials
Double glazed window panes are used. These window panes have air between glass sheets that provides good insultation

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9th Class Physics English Medium Chapter 9 Preparation - Set 9

Question # 1

Define thermal conductivity

Ans 1: Thermal Conductivity: The rate of flow of heat across the opposite faces of a meter cube of a of that substance.
Ans 2: Unit: The S.I unit of thermal conductivity is Wm k-1

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Matric Part 1/9th Class Physics Chapter 9 Short Question Test With Answer for Unit 9 Transfer of Heat

9th Class English Medium Subjects

9th Class Urdu Medium Subjects

Online Short Questions For Chapter 9 "9th Class Physics English Medium Chapter 9 Preparation "

Physics (New Book) - 9th Class Physics English Medium Chapter 9 Preparation

What is meant by convection current

We wear whit and light coloured clothes in summer why

Explain why

Described an experiment of convection.

Define thermals.

Describe relation of radiation of heat and surface area

In a thermos flask, how heat is prevented to enter or leave the flask

Transfer of Heat.

Why bottom of cooking pots are made black

Define rate of flow of heat?

Prepare Complete Set Wise Questions For Chapter 9 "9th Class Physics English Medium Chapter 9 Preparation "

Set 1

Set 2

Set 3

Set 4

Set 5

Set 6

Set 7

Set 8

Set 9

9th Class Physics English Medium Chapter 9 Preparation - Set 1

What is meant by convection current

We wear whit and light coloured clothes in summer why

Explain why

Described an experiment of convection.

Define thermals.

Describe relation of radiation of heat and surface area

In a thermos flask, how heat is prevented to enter or leave the flask

Transfer of Heat.

Why bottom of cooking pots are made black

Define rate of flow of heat?

9th Class Physics English Medium Chapter 9 Preparation - Set 2

Define convection current in air

What is the thermo flask?

Write any twoi factor on which rate of flow of heat depends

Define the of flow of heat and write its mathematical form.

Why transfer of heat in fluids takes place by convection

In a thermos flask, how heat is prevented to enter or leave the flask

Why metal are good conductors of heat?

Write name of two expert Thermal riders

What happen when burner remove under beaker

When does an object is radiating more heat than it is absorbing

9th Class Physics English Medium Chapter 9 Preparation - Set 3

How various surfaces can be compared by a Lessie cube

How rooms are heated using gas heaters

What is global warming

What is meant by global warming

Why transfer of heat in fluids takes place by convection

Write any twoi factor on which rate of flow of heat depends

Define radiation

Why transfer of heat in fluids takes place by convection?

Where is convection currents used

What is greenhouse effect?

9th Class Physics English Medium Chapter 9 Preparation - Set 4

Why metal are good conductors of heat?

Why is land breeze blow from land towards sea

Write the ways by which transfer of heat takes place

Give two uses of convection currents.

Why is scientific reason to wear white and light coloured clothes in summer

Why interior surface of pots made polished

Define rate of flow of heat?

What is the thermos flask

Transfer of Heat.

Explain the impact of greenhouse effect in global

9th Class Physics English Medium Chapter 9 Preparation - Set 5

Why are the metals good conductors of heat

How many sides of a Leslie cube are

What is green house effect