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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
In what factors flow of heat depends upon for solids
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Ans 1: In rate of heat flow depends uponArea of cross section of solidsLength of solidDifference of temperature between ends of solids.
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
In what factors flow of heat depends upon for solids
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Ans 1: In rate of heat flow depends uponArea of cross section of solidsLength of solidDifference of temperature between ends of solids.
9th Class Physics English Medium Chapter 9 Preparation - Set 2
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
9th Class Physics English Medium Chapter 9 Preparation - Set 3
Question # 1
Define thermal conductivity.
- Ans 1: substance maintained at a temperature difference of one kelvin is called the thermal conductivity of that substance. Unit: The SI unit of thermal conductivity is Wm-1 K-1
9th Class Physics English Medium Chapter 9 Preparation - Set 4
Question # 1
What is greenhouse effect
- Ans 1: When heat energy reflects from the earth surface, rays with shorter wavelength reflect back toward Sun but before all this radiation cn escape to outer space, greenhouse gases in the atmosphere absorb some of it which makes the atmosphere warmer and Earth surface also warmer This is called greenhouse effect
9th Class Physics English Medium Chapter 9 Preparation - Set 5
Question # 1
What is thermal conductivity
- Ans 1: Thermal conductivity: The rate of flow of heat across the opposite face of a meter cube of a substance is called thermal Conductivity of the substance
- Ans 2: Unit: Wm k
9th Class Physics English Medium Chapter 9 Preparation - Set 6
Question # 1
What is Leslie cube
- Ans 1: A Leslie cube is a metal box having faces of different nature and it is used to identify the emission of radiations.
9th Class Physics English Medium Chapter 9 Preparation - Set 7
Question # 1
Transfer of Heat.
- Ans 1: Thermal energy from a hot body flows to a cold body in the form of heat. This is called as transfer of heat .
9th Class Physics English Medium Chapter 9 Preparation - Set 8
Question # 1
Why conduction of heat does not take place in gases
- Ans 1: Gases are poor conductors of heat as there are no free electrons in gases so conduction cannot take place in gases Conduction needs the molecules nearby while in gases there while in gases there are vast spaces and conduction process is ot possible.
9th Class Physics English Medium Chapter 9 Preparation - Set 9
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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