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

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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

Why heat does not reach us by convection from a fire place

Ans 1: Heat does not reach us by convention from a fireplace because the air getting heat from the fireplace does not move in all direction. Hot air moves upward from the fireplace and heat reaches us by waves called radiation.

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

Set 1

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Set 2

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Set 3

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Set 4

10 Questions
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Set 5

10 Questions
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Set 6

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Set 7

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Set 8

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Set 9

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

Question # 1

Why heat does not reach us by convection from a fire place

Ans 1: Heat does not reach us by convention from a fireplace because the air getting heat from the fireplace does not move in all direction. Hot air moves upward from the fireplace and heat reaches us by waves called radiation.

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

Question # 1

Write two uses of conductors.

Ans 1: Uses of conductors: Good conductors are used when quick transfer of heat is required through a body Cookers, cooking plate, boiler, radiators and condensers of refrigerators, etc are made of metals such as aluminum and coper for the better conduction
Metal boxes are used to make ice and ice cream
Ans 2: Uses of non-conductors: Insulators or non-conductors are used in home utensils such as handles of sauce-pans hot plates spoons etc they are made up of wood or plastic
Air is one of the bad conductors or best insulator That is why cavity walls i.e. two walls those are separated by an air space and double glazed windows keep the houses warm in winter and cool in summer

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

Question # 1

Why we avoid wear dark colure dresses in summer season

Ans 1: Dark color absolves high energy radiations and becomes hot That is reason that we avoid wear dark color dresses in summer season

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

Question # 1

Which surface is good absorber and which is poor absorber of heat

Ans 1: A dull black surface is a good absorber and a polished surface is poor absorber of heat

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

Question # 1

What is the thermos flask

Ans 1: The thermos flask is a double walled glass vessel, that prevent heat to enter or leave the flask and maintain the temperature inside the flask

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

Question # 1

How rooms are heated using gas heaters

Ans 1: Rooms are heated using gas heaters by radiation

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

Question # 1

Differentiate between conductors and insulator

Ans 1: Conductors: A conductor easily transfers energy in the form of electricity and heat
Good conductors are used when quick transfer of heat is required through a body Thus cookers, cooking plate etc.
Metal boxes are used for making ice, ice cream etc
Ans 2: Non-Conductor: Non-conductor does not easily transfer of energy in the form of electricity and heat
Ceiling of rooms is covered by insulating materials because transfer of heat is low
Insulators or non-conductors are used in home utensils such as handles of sauce-pans hot plates, spoon etc, They are made up of wood or plastic.

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

Question # 1

Define sea breeze how it is cause

Ans 1: On a hot day cold air from the sea begins to move toward the land this is called sea land breeze,
Ans 2: Reason: On a day the temperature of land increase more quickly than the sea It is because the specific heat of land is much smaller as compared to water The air above land gets hot and rises up Cold air from sea begins to move towards land It is called sea breeze

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

Question # 1

Write any two measures to save energy

Ans 1: Hot water thanks are insulated by plastic or foam lagging Wall cavities are filled with plastic foam or mineral wool Ceiling of rooms is covered by insulating materials ceiling