Combustion and Flame DPP Class 8 PDF

DPP: Combustion and Flame (Class 8) Multiple Choice Questions (MCQs) \* The process of burning a substance in air to produce heat and light is called: \* (a) respiration \* (b) combustion \* (c) photosynthesis \* (d) evaporation \* A substance that catches fire easily and burns rapidly is cal...

DPP: Combustion and Flame (Class 8) Multiple Choice Questions (MCQs) \* The process of burning a substance in air to produce heat and light is called: \* (a) respiration \* (b) combustion \* (c) photosynthesis \* (d) evaporation \* A substance that catches fire easily and burns rapidly is called: \* (a) fuel \* (b) oxygen \* (c) water \* (d) carbon dioxide \* The lowest temperature at which a substance catches fire is called: \* (a) ignition temperature \* (b) boiling point \* (c) melting point \* (d) freezing point \* The outermost zone of a candle flame is: \* (a) blue zone \* (b) yellow zone \* (c) black zone \* (d) orange zone \* The zone of a candle flame that has the highest temperature is: \* (a) blue zone \* (b) yellow zone \* (c) black zone \* (d) orange zone \* The products of complete combustion of a hydrocarbon are: \* (a) carbon dioxide and water \* (b) carbon monoxide and water \* (c) carbon and water \* (d) carbon dioxide and carbon monoxide \* The process of extinguishing a fire by cutting off the supply of oxygen is called: \* (a) cooling \* (b) smothering \* (c) removal of fuel \* (d) dilution \* A substance that can be used to extinguish a fire caused by electrical short circuit is: \* (a) water \* (b) carbon dioxide \* (c) sand \* (d) foam \* The type of combustion that occurs in a Bunsen burner when the air hole is open is: \* (a) complete combustion \* (b) incomplete combustion \* (c) spontaneous combustion \* (d) explosive combustion \* The process of burning a fuel completely without producing smoke is called: \* (a) complete combustion \* (b) incomplete combustion \* (c) spontaneous combustion \* (d) explosive combustion \* The substance that supports combustion is: \* (a) carbon dioxide \* (b) oxygen \* (c) nitrogen \* (d) hydrogen \* A substance that does not catch fire easily is called: \* (a) inflammable \* (b) non-inflammable \* (c) combustible \* (d) flammable \* The process of burning a fuel in insufficient oxygen is called: \* (a) complete combustion \* (b) incomplete combustion \* (c) spontaneous combustion \* (d) explosive combustion \* The type of flame produced when a substance burns in insufficient oxygen is: \* (a) blue \* (b) yellow \* (c) orange \* (d) black \* The process of burning a fuel without any external source of ignition is called: \* (a) complete combustion \* (b) incomplete combustion \* (c) spontaneous combustion \* (d) explosive combustion \* The zone of a candle flame that is the least hot is: \* (a) blue zone \* (b) yellow zone \* (c) black zone \* (d) orange zone \* A substance that can catch fire easily and burn rapidly is called: \* (a) fuel \* (b) oxygen \* (c) water \* (d) carbon dioxide \* The process of burning a substance in air to produce heat and light is called: \* (a) respiration \* (b) combustion \* (c) photosynthesis \* (d) evaporation \* The lowest temperature at which a substance catches fire is called: \* (a) ignition temperature \* (b) boiling point \* (c) melting point \* (d) freezing point \* The outermost zone of a candle flame is: \* (a) blue zone \* (b) yellow zone \* (c) black zone \* (d) orange zone Answers to the MCQ DPP: Combustion and Flame Answers: \* (b) combustion \* (a) fuel \* (a) ignition temperature \* (a) blue zone \* (a) blue zone \* (a) carbon dioxide and water \* (b) smothering \* (b) carbon dioxide \* (a) complete combustion \* (a) complete combustion \* (b) oxygen \* (b) non-inflammable \* (b) incomplete combustion \* (d) black \* (c) spontaneous combustion \* (c) black zone \* (a) fuel \* (b) combustion \* (a) ignition temperature \* (a) blue zone