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9th Class Physics Chapter 8 Online Preparation
9th Class English Medium Subjects
9th Class Urdu Medium Subjects
Online Short Questions For Chapter 8 "9th Class Physics English Medium Chapter 8 Preparation "
Try The Short Questions For 9th Class Physics English Medium Chapter 8 Preparation
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Total Questions10
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Available Sets11
Physics (New Book) - 9th Class Physics English Medium Chapter 8 Preparation
Question # 1
What is the effect of temperature on evaporation.
- Ans 1: At high temperature more molecules of a liquid are moving with high velocities. Thus more molecules are escaping from its surface The evaporation is faster at high temperature than at low temperature.
Prepare Complete Set Wise Questions For Chapter 8 "9th Class Physics English Medium Chapter 8 Preparation "
9th Class Physics English Medium Chapter 8 Preparation - Set 1
Question # 1
What is the effect of temperature on evaporation.
- Ans 1: At high temperature more molecules of a liquid are moving with high velocities. Thus more molecules are escaping from its surface The evaporation is faster at high temperature than at low temperature.
9th Class Physics English Medium Chapter 8 Preparation - Set 2
Question # 1
Define convection?
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Ans 1:
Transfer of heat by
actual movement ofmoleculer fromhot place to a cold place is known as convection.
9th Class Physics English Medium Chapter 8 Preparation - Set 3
Question # 1
What is meant by anomalous expansion of water
- Ans 1: Water on cooling below 4c begins to expand until it reaches further cooling its volume increases suddenly as it changes into ice at When ice is cooled below it contracts i.e. its volume decreases like solids. This unusual expansion of water is called the anomalous expansion of water
9th Class Physics English Medium Chapter 8 Preparation - Set 4
Question # 1
Give the names of factors on which evaporation of a liquid depends
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Ans 1: The rate of evaporation is affected by following factorsTemperature, Surface area, wind , nature of liquid
9th Class Physics English Medium Chapter 8 Preparation - Set 5
Question # 1
How cooling is produced in refrigerator
- Ans 1: Cooling is produced in refrigerators by evaporation of a liquefied gas. This produce cooling effect. Freon, a CFC, was used as a refrigerant gas. Bus its use has been forbidden when it was known that CFC is the cause of ozone depletion in the upper atmosphere which results increase in amount of UV rays from the Sun. The rays are harm ful to all living matter Freon gas is now replaced by Ammonia and other substances which are not harmful to the environment
9th Class Physics English Medium Chapter 8 Preparation - Set 6
Question # 1
What are the factors on which internal energy depends upon.
- Ans 1: i. Mass of body ii. Kinetic energy of a body iii Potential energy of a body.
9th Class Physics English Medium Chapter 8 Preparation - Set 7
Question # 1
Define heat
- Ans 1: Heat is the energy that is transferred from one body to the other in thermal contact with each other as a result of the difference of temperature between them
- Ans 2: Example: Heat is needed for cooking
- Ans 3: Unit: Its unit is j
9th Class Physics English Medium Chapter 8 Preparation - Set 8
Question # 1
What is meant by evaporation
- Ans 1: Evaporation is a changing of aa liquid into apours from surface of liquid without heating
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Ans 2: Factors The rate of evaporation is affected by various factors.Temperature'Surface AreaWindNature of the Liquid
- Ans 3: Evaporation causes cooling: During evaporation fast moving molecules escape out from the surface of the liquid Molecules that have lower kinetic energies are left behind This lowers the average kinetic energy of the liquid molecules and the temperature of the liquid So evaporation of perspiration helps to cool our bodies.
9th Class Physics English Medium Chapter 8 Preparation - Set 9
Question # 1
Differentiate between freezing and melting point
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Ans 1: Freezing point: In liquids the point of temperature which liquids starts to become solidsFreezing point is that point which liquids starts to become solidsWater starts to become ice at temperature.
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Ans 2: Melting point: In solids the point of temperature which solids starts to become liquidsMelting point is that point which solid starts of become water at temperature of
9th Class Physics English Medium Chapter 8 Preparation - Set 10
Question # 1
What is meant by internal energy of a body
- Ans 1: The sum of potential energy and Kinetic energy associated with atoms, molecules and particles of a body is called its internal energy
9th Class Physics English Medium Chapter 8 Preparation - Set 11
Question # 1
What are Kelvin scale and Fahrenheit scale
- Ans 1: Fahrenheit scale: On Fahrenheit scale, the interval between lower and upper fixed points is divided into 180 equal parts Its lower and upper fixed points are and respectively
- Ans 2: Kelvin scale: In Kelvin scle the interval between the lover and upper fixed point on this scale corresponds to 273 K and upper fixed point is referred as 373 The zero on this scale is called the absolute zero and is equal to 273c
