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WebOct 4, 2024 · Combustion and Flame Class 8 Science NCERT Textbook Questions. Question 1. List conditions under which combustion can take place. Answer: Combustion can take place in the presence of: (a) a combustible substance. (b) oxygen, that is, the supporter of combustion. (c) attainment of ignition temperature of the substance. … WebClass 8 Science Chapter 6 MCQ with Answers 1. A substance which reacts with oxygen giving heat is called a combustible substance. Which, one of the following is a combustible substance? (a) iron nail (b) glass (c) stone piece (d) wood 2. Choose the incorrect statement from the following. A good fuel is one which: (a) is readily available. rizhosphere extraction selenium
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WebAug 8, 2024 · Answer. 5. The kitchen and laundry are high consumers of water using between 15-20% of total water consumption. What is the most effective way to save water in these rooms? (a) Only use appliances when full. (b) Use energy efficient appliances. (c) Re use rinse water from the washing machine. WebOct 3, 2024 · Question 1. The process of loosening of the soil is called (a) tilling (b) harvesting (c) spraying (d) weeding Answer Question 2. Which is pesticides? (a) 2, 4-dichlorophenoxyacetic acid (b) Malathion (c) Metolachlor (d) Chloroform Answer Question 3. Seed drill is used for (a) harvesting (b) cleaning the seed (c) sowing (d) weeding Answer WebAug 18, 2024 · Question 6. The population of the world is (a) 77 billions (b) 7.0 billions (c) 0.77 billions (d) 0.077 billions Answer Question 7. Movement of people in. and out of an area is called (a) migration (b) death rate (c) birth rate (d) growth rate Answer Question 8. How have USA and Australia gained in respect of population growth? (a) By immigration rizha twitter