NCERT Solutions for Chapter: Combustion and Flame, Exercise 3: SHORT ANSWER QUESTIONS
Author:NCERT
NCERT Science Solutions for Exercise - NCERT Solutions for Chapter: Combustion and Flame, Exercise 3: SHORT ANSWER QUESTIONS
Attempt the practice questions on Chapter 6: Combustion and Flame, Exercise 3: SHORT ANSWER QUESTIONS with hints and solutions to strengthen your understanding. NCERT Exemplar Science - Class 8 solutions are prepared by Experienced Embibe Experts.
Questions from NCERT Solutions for Chapter: Combustion and Flame, Exercise 3: SHORT ANSWER QUESTIONS with Hints & Solutions
HARD
8th CBSE
IMPORTANT
Match the items of Column A with the items of Column B.
| Column A | Column B |
| (a) Oxides of sulphur and nitrogen | (i) fire extinguisher |
| (b) CNG | (ii) incomplete combustion of coal |
| (c) Oxygen | (iii) very low ignition temperature |
| (d) inflammable substance | (iv) acid rain |
| (e) carbon dioxide | (v) necessary for combustion |
| (f) carbon monoxide | (vi) fuel for automobiles. |
HARD
8th CBSE
IMPORTANT
Match the following for the flame of a candle.
| Column A | Column B | Column C |
| (a) hottest part | (i) innermost zone of unburnt wax vapours | (x) blue |
| (b) moderately hot | (ii) middle zone of partial combustion | (y) black |
| (c) least hot | (iii) outer zone of complete combustion | (z) yellow |
MEDIUM
8th CBSE
IMPORTANT
Increased concentration of nitrogen in air is believed to cause global warming.
EASY
8th CBSE
IMPORTANT
Greater the calorific value, better is the fuel.
EASY
8th CBSE
IMPORTANT
Middle zone is the hottest zone of a flame.
EASY
8th CBSE
IMPORTANT
The substances which vaporise during burning, give flame.
EASY
8th CBSE
IMPORTANT
Cracker on ignition produces sound. Why?
MEDIUM
8th CBSE
IMPORTANT
What do you understand by fuel efficiency?
