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Hello Students, Toady we are starting our Class 8 Science Chapter-6 sources of energy of DAV Book 2021. If You are in class 8 and looking for Class 8 Science Chapter-6 sources of energy 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 : sources of energy

This Post Contains All The Exercises of Chapter 6 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. Coal and petroleum are non – renewable sources of energy.
  2. Solar is a major renewable , natural resource.
  3. The process , in which coal is strongly heated in the absence of air , is known as destructive distillation.
  4. In oils wells, natural gas is found above the layer of petroleum.
  5. Coal tar is a black viscous liquid , obtained by destructive distillation of coal.

B. STATE TRUE OR FALSE FOR THE FOLLOWING STATEMENTS.

  1. Fossil fuelsare renewable natural resources. false
  2. Antracite has higher carbon content than lignite. true
  3. Coke can be used to make fuel gases. true
  4. Natural gas is found below the petroleum layer. false
  5. Burning of fossil fuels is a major source of pollution. true

C. TICK THE CORRECT OPTION.

  1. The highest grade of coal is known as- (c)anthracite.
  2. coke and coal tar are obtained from- (b)coal
  3. Different types of coal generally have the- (d)different content of volatile material as well as different percentage of carbon.
  4. A product , that is not obtained through the refining of petroleum, is- (c)coal gas
  5. Which of the following is a renewable source of energy? (d)tidal energy

D. ANSWER THE FOLLOWING QUESTIONS IN BRIEF.

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


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