Combustion and Flame-Flame [CBSE (Central Board of Secondary Education) Class-8 Science]: Questions 1 - 4 of 4
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Question 1
Question MCQ▾
Hottest part of flame is:
Choices
Choice (4) | Response | |
---|---|---|
a. | Zone A | |
b. | Outermost zone | |
c. | Zone B | |
d. | Both a. and b. are correct |
Question 2
Question MCQ▾
Which types of substances form flame?
Choices
Choice (4) | Response | |
---|---|---|
a. | Combustible substances which have very low ignition temperature and can easily catch fire. | |
b. | Combustible gas burns rapidly and produces heat and light | |
c. | Combustible substance which produces energy when burnt | |
d. | Combustible substances which vaporise during burning form a flame |
Question 3
Question MCQ▾
Part of the candle flame which is least hot and black in colour is:
Choices
Choice (4) | Response | |
---|---|---|
a. | Zone B | |
b. | Zone C | |
c. | Innermost region | |
d. | Both b. and c. are correct |
Question 4
Question MCQ▾
Zone of the candle flame which is yellow in colour is:
Choices
Choice (4) | Response | |
---|---|---|
a. | Innermost zone | |
b. | Middle zone | |
c. | Zone B | |
d. | Both b. and c. are correct |