8th Standard CBSE Syllabus & Materials
8th Standard CBSE
CBSE 8th Social Science Theme D - Factors of Production - New Model Questions Papers Study Material - QB365 Set A
NEW8th Standard CBSE
CBSE 8th Social Science Theme C - Universal Franchise and India's Electoral System - New Model Questions Papers Study Material - QB365 Set A
NEW8th Standard CBSE
CBSE 8th Social Science Theme B - The Rise of the Marathas - New Model Questions Papers Study Material - QB365 Set A
NEW8th Standard CBSE
CBSE 8th Social Science Theme B - Reshaping India's Political Map - New Model Questions Papers Study Material - QB365 Set A
NEW8th Standard CBSE
CBSE 8th Social Science Theme A - Natural Resources and Their Use - New Model Questions Papers Study Material - QB365 Set A
NEW8th Standard CBSE
CBSE 8th Science Keeping Time with Skies - New Model Questions Papers Study Material - QB365 Set A
Published on: 28/08/2019
Combustion and Flame
Download CBSE Class 8th Standard CBSE Science question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 8th Standard CBSE Science
Questions + Answers key
Take MCQ Science Test
1.
________ is the rise in temperature of the atmosphere of the earth.
2.
Incomplete combustion of a fuel gives poisonous _________ gas.
3.
Fuels differ in their _______ and _______.
4.
A liquid fuel, used in homes is___________
5.
Burning of wood and coal causes___________ of air.
6.
Choose the incorrect statement from the following: A good fuel is one which:
is readily available
produces a large amount of heat
leaves behind many undesirable substances
burns easily in air at a moderate rate.
7.
The substance expected to have the highest ignition temperature out of the following is
kerosene
petrol
coal
alcohol
8.
If a person's clothes catch fire. The best way to extinguish the fire is to
throw water on the clothes
use fire extinguisher
cover the person with a woolen blanket
cover the person with a polythene sheet
9.
On placing an inverted tumbler over a burning candle. the flame extinguishes after sometime. This is because of non-availability of
oxygen
water vapours
carbon dioxide
wax
10.
A substance which reacts with oxygen giving heat is called a combustible substance. Which one of the following is a combustible substance?
Iron nail
Glass
Stone piece
Wood
11.
The substances which vaporize during burning, give flame.
12.
Increased concentration of nitrogen in air is believed to cause global warming.
13.
Food is a fuel for our body.
14.
The substances which vaporise during buming give flame.
15.
Alcohol, CNG and LPG are inflammable substances.
16.
moderately hot
17.
hottest part
18.
Wood
19.
Carbon monoxide
20.
Inflammable substance
21.
What is the composition of a match-stick?
22.
Name different zones of flame.
23.
Define ignition temperature.
24.
What happens when charcoal burns in the air?
25.
What is combustion?
1.
( )
Global warming
2.
( )
carbon monoxide
3.
( )
Efficiency, cost
4.
( )
kerosene
5.
( )
pollution
6.
(b)
produces a large amount of heat
7.
(c)
coal
8.
(c)
cover the person with a woolen blanket
9.
(a)
oxygen
10.
(d)
Wood
11.
(a)
12.
(b)
13.
(a)
14.
(a)
15.
(a)
16.
( )
middle zone of partial combustion - yellow
17.
( )
outer zone of complete combustion - blue
18.
( )
Deforestation
19.
( )
Incomplete combustion of coal
20.
( )
Very low ignition temperature
21.
( )
A mixture of antimony trisulphide, potassium chlorate and white phosphorous with some glue and starch applied on the head of the match stick.
22.
( )
Three zones of a flame are :
(i) Non-luminous zone.
(ii) Luminous zone.
(iii) Dark zone.
23.
( )
The lowest temperature at which a substance catches fire is called its ignition temperature.
24.
( )
Charcoal bums in air producing carbon dioxide, heat and light.
25.
( )
A chemical process in which a substance burns in the presence of oxygen to release heat is called combustion.
8th Standard CBSE Syllabus & Materials
8th Standard CBSE
CBSE 8th Science Particulate Nature of Matter - New Model Questions Papers Study Material - QB365 Set A
NEW8th Standard CBSE
CBSE 8th Science Pressure, Winds, Stroms and Cyclones - New Model Questions Papers Study Material - QB365 Set A
NEW8th Standard CBSE
CBSE 8th Mathematics Quadrilaterals - New Model Questions Papers Study Material - QB365 Set A
NEW8th Standard CBSE
CBSE 8th Mathematics A story of Numbers - New Model Questions Papers Study Material - QB365 Set A
CBSE 8th Standard CBSE Subjects
CBSE Standards
