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9th Class Physics Chapter 9 Online Preparation
9th Class English Medium Subjects
9th Class Urdu Medium Subjects
Online Short Questions For Chapter 9 "9th Class Physics English Medium Chapter 9 Preparation "
Try The Short Questions For 9th Class Physics English Medium Chapter 9 Preparation
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Total Questions10
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Available Sets9
Physics (New Book) - 9th Class Physics English Medium Chapter 9 Preparation
Question # 1
What is radiation
- Ans 1: Radiation is the mode of transfer of heat from one place to another place in the form of waves called electromagnetic waves.
Prepare Complete Set Wise Questions For Chapter 9 "9th Class Physics English Medium Chapter 9 Preparation "
9th Class Physics English Medium Chapter 9 Preparation - Set 1
Question # 1
What is radiation
- Ans 1: Radiation is the mode of transfer of heat from one place to another place in the form of waves called electromagnetic waves.
9th Class Physics English Medium Chapter 9 Preparation - Set 2
Question # 1
How does heat reaches us from the sun?
- Ans 1: Heat from the Sun reaches us in the form of electromagnetic waves, which do not require any material medium for their transfer. This is called radiation.
9th Class Physics English Medium Chapter 9 Preparation - Set 3
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
9th Class Physics English Medium Chapter 9 Preparation - Set 4
Question # 1
Write two examples of good and bad conductors each
- Ans 1: Good Conductors of Heat is Iron, Copper, Aluminum Bad conductors of heat is Wool ,Fur, Air
9th Class Physics English Medium Chapter 9 Preparation - Set 5
Question # 1
Explain the impacted of treehouse effect in global warming
- Ans 1: Earth atmosphere contains Co2 and water vapors It causes greenhouse effect and thus retains the temperature of Earth by trapping more heat due to green house effect This phenomenon is called global warming.
9th Class Physics English Medium Chapter 9 Preparation - Set 6
Question # 1
Give two uses of convection currents
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Ans 1: Convention current set up by electric, gas or coal heaters help to warm our homes and offices.Land and sea breeze are also cause by convection currents.
9th Class Physics English Medium Chapter 9 Preparation - Set 7
Question # 1
Write any two uses of conductors
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Ans 1: Good Conductors are used when quick transfer of heat is required through a body Cookers, cooking plates, boiler, radiators and condensers of refrigerator etc, are made of metals such as aluminum and copper for the better conductionMetal boxes are used for makijg ice and ice cream etc
9th Class Physics English Medium Chapter 9 Preparation - Set 8
Question # 1
Explain why
- Ans 1: A metal colder to than wood kept in a place: Metals are good conductors of heat while wood is insulator which does not ass any heat transfer process So feels warmer on touching
- Ans 2: Land breeze blows from land toward sea: When ot and lighter air above the rises p the colder and heavier air from land rushes toward sea to fill the place Due to this land breeze blows from land toward sea
- Ans 3: Double walled glass vessel is used in thermo flask: The thermo flask is designed to keep liquids hot by minimizing heat losses by conduction convection and radiation The heat losses through the sides of flask are prevented by vacuum between the double walled glass of the flask thus double walled glass vessel is used in thermo flask to maintain inside temperature.
9th Class Physics English Medium Chapter 9 Preparation - Set 9
Question # 1
We wear whit and light coloured clothes in summer why
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Ans 1: We wear white and light oloured clothes in summer which reflect most of the heat radiation reaching us during the hot day
