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Hello Students, Toady we are starting our Class 8 Science Chapter-7 combustion of DAV Book 2021. If You are in class 8 and looking for Class 8 Science Chapter-7 combustion CBSE/DAV Book Solution 2021. Then you are absolutely at the right place of knowledge decode

Class 8 Science Chapter 1 : The Cell- Its Structure and Functions 

class 8 science chapter 2 : Microorganisms : friends or foes

class 8 science chapter 3 : Metals and Non-metals

class 8 science chapter 4 : force and pressure

class 8 science chapter 5 : friction

class 8 science chapter 6 : sources of energy

This Post Contains All The Exercises of Chapter 7 Science Of Class 8 .

A.Fill In The Blanks.

B.Math The Following.

C.Tick(√) The Correct Option

D.Answer The Following Questions in Brief 

E.Answer The Following Questions

SOLUTION

A. FILL IN THE BLANKS.

  1. A good fuel should have its ignition temperature above the room temperature.
  2. Burning of cowdung cakes is an example of slow combustion.
  3. The innermost zone of a candle flame , is the coldest.
  4. The non-luminous zone of a candle flame is the hottest part of the flame.
  5. During incomplete combustion of a fuel , carbondioxide gas is formed.

B. STATE TRUE OR FALSE FOR THE FOLLOWING STATEMENTS.

  1. Coal is an inflammable fuel. false
  2. The outermost part of a candle flame contains unburnt carbon particles. false
  3. The heat produced , by burning completely one kilogram of a given fuel , is known as the efficiency of that fuel. true
  4. All solid fuels have a higher calorific value than liquid and gaseous fuels. false
  5. Sulphur dioxide gas , produced during combustion of fossil fuels , causes acid rain. true

C. TICK THE CORRECT OPTION.

  1. An example of a non-combustible substances is- (d)iron
  2. A fuel starts burning only when it is heated to- (b)its ignition temperature
  3. The highest temperature zone of a candle flame / is its- (c)blue zone
  4. The amount of heat produced , on complete burning of 10 kg of a given fuel , in pure oxygen , equals H kilojoule. The calorific fuel , of that fuel , would equal- (a)0.1H KJ/KG
  5. The gas produced , due to incomplete combustion of carbon fuels , is- (b)carbon monoxide

D. ANSWER THE FOLLOWING QUESTIONS IN BRIEF.

Thank You  Students For being a part of our KNOWLEDGEDECODE Family.


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