Free CBSE Class 8 Science Combustion and Flame Worksheets

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Sample CBSE Class 8 Science Combustion and Flame Worksheet Questions

Fill in the blanks: The colour of innermost zone of unburnt wax is ___________.
4 kg of fuel is burnt completely and 2000kJ of heat produced. Find the calorific value of fuel.
If the calorific value of fuel is 6000kJ/kg and the mass of the fuel burnt is 5kg. Calculate the heat produced.
Fill in the blanks: The cleanest fuel is _______.
1. hydrogen gas 2. cowdung cake 3. petrol 4. kerosene
Choose the correct option: Coal burns with _________.
1. flame 2. only glow 3. both flame and glow 4. None of these
State True or False: Sun produces heat and light due to nuclear reaction.
1. true 2. false
Choose the correct option: The substance that doesn't burn with flame is _________.
1. LPG 2. camphor 3. charcol 4. dry grass
Fill in the blanks: Fuel efficiency of biogas is ________ than that of LPG.
Choose the correct option: Magnesium ribbon on burning in air produces.
1. magnesium oxide, water and light 2. magnesium oxide, light and heat 3. magnesium oxide and heat 4. magnesium oxide and water
State True or False: Charcol is better than wood.
1. true 2. false

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