Class 8 Exam > Class 8 Notes > Science Class 8 > Unit Test: Combustion and Flame
Unit Test: Combustion and Flame | Science Class 8 PDF Download
Time: 1 hour
M.M. 30
Attempt all questions.
Question numbers 1 to 5 carry 1 mark each.
Question numbers 6 to 8 carry 2 marks each.
Question numbers 9 to 11 carry 3 marks each.
Question number 12 & 13 carry 5 marks each.
Q1: Which of the following is not a combustible substance?
(i) Wood
(ii) Paper
(iii) Iron nails
(iv) Charcoal
Q2: Which of the following substances has the highest calorific value?
(i) Wood
(ii) Coal
(iii) LPG
(iv) Petrol
Q3: The substance which catches fire easily and has a very low ignition temperature is called __________.
Q4: The lowest temperature at which a substance catches fire is called __________.
Q5: Water is not suitable for extinguishing fires involving __________.
Q6: What is spontaneous combustion? Give an example.
Q7: Why is carbon dioxide considered a good fire extinguisher?
Q8: Explain why water is not used to extinguish fires involving oil or petrol.
Q9: Describe the three different zones of a candle flame.
Q10: Why is LPG considered a better domestic fuel compared to wood?
Q11: What is an explosion? How is it different from rapid combustion?
Q12: Explain the environmental impact of using fossil fuels like coal and petroleum.
Q13: Differentiate between complete and incomplete combustion.
You can find the solutions of this Unit Test here: Unit Test(Solution): Combustion and Flame
The document Unit Test: Combustion and Flame | Science Class 8 is a part of the Class 8 Course Science Class 8.
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FAQs on Unit Test: Combustion and Flame - Science Class 8
| 1. What is combustion? |  |
Ans.Combustion is a chemical process in which a substance reacts with oxygen to produce heat and light. It is commonly referred to as burning and is essential for various applications, including engines, heating, and cooking.
| 2. What are the types of combustion? | |
Ans.The two main types of combustion are complete combustion and incomplete combustion. Complete combustion occurs when there is enough oxygen present, resulting in carbon dioxide and water as products. Incomplete combustion happens when there is insufficient oxygen, leading to the production of carbon monoxide, soot, or other compounds.
| 3. What is a flame, and what are its parts? | |
Ans.A flame is the visible, gaseous part of a fire. It consists of three main parts: the inner core, which is the hottest part; the outer envelope, which is cooler and typically appears blue; and the luminous zone, which is yellow due to incomplete combustion of fuel.
| 4. What are the conditions necessary for combustion to occur? | |
Ans.The three essential conditions for combustion are fuel, oxygen, and heat, commonly referred to as the fire triangle. If any one of these components is removed, combustion cannot take place.
| 5. Why is incomplete combustion dangerous? | |
Ans.Incomplete combustion is dangerous because it produces harmful byproducts like carbon monoxide, which is a colorless, odorless gas that can be fatal in high concentrations. It reduces the efficiency of fuel usage and can lead to pollution and health hazards.
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