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Class 8 Science Combustion and Flame Question and Answers

Last updated on October 28th, 2023 at 05:40 pm

Class 8 Combustion and Flame Question and Answers

 

Class 8 Combustion and Flame Question and Answers | NCERT Solutions Class 8 Science | for the students of CBSE / ICSE and all board exams..

Answer the following questions:-

Q: Name a few fuels used in trade and industry?

A: Cowdung, wood, coal, charcoal, petrol, diesel, compressed natural gas (CNG), etc.

 

Q: What fuels are used for running automobiles?

A: Petrol, diesel, compressed natural gas (CNG), etc.

 

Q: What is the difference between the burning of a candle and the burning of a fuel like coal?

A: A candle burns with a flame whereas coal does not.

 

Q: What is the chemical process of burning?

A: Burning is a chemical reaction that involves the combination of a fuel with oxygen to produce heat, light, and various byproducts such as carbon dioxide and water vapor.

 

Q: What are the types of flame produced during the burning process?

A: The types of flame produced during the burning process are non-luminous flame and luminous flame.

 

Q: What happens when we burn magnesium?

A: Magnesium burns to form magnesium oxide and produces heat and light.

 

Q: What happens when we burn a piece of charcoal?

A: Charcoal burns in air and produces heat and light.

 

Q: What is combustion?

A: Combustion is a chemical process in which a substance reacts with oxygen to give off heat.

 

Q: What is a fuel?

A: A fuel is a substance that undergoes combustion and gives off heat, and may be solid, liquid or gas.

 

Q: Does light get emitted during combustion?

A: Yes, sometimes light is given off during combustion, either as a flame or as a glow.

 

Q: What happens to the candle flame when air is not available?

A: The flame finally goes off because the air is not available.

 

Q: Why do you have to use paper or kerosene oil to start a fire in wood or coal?

A: Paper or kerosene oil is used to start a fire in wood or coal because their ignition temperatures are higher and they need a higher temperature to catch fire.

 

Q: What are forest fires?

A: Forest fires are uncontrolled fires that occur in forests and other wooded areas.

 

Q: What is ignition temperature?

A: Ignition temperature is the lowest temperature at which a substance catches fire.

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