CBSE Class 8 Science Worksheet
Combustion and Flame
1.
Choose the correct answer: The fuel which is used for running automobiles is ___________.
A)
Wood
B)
Biogas
C)
Coke
D)
Petrol
2.
Fill in the Blank: The amount of heat energy produced on complete combustion of 1 kg of a fuel is called is its _________.
3.
Lpg is better domestic fuel than wood
A)
True
B)
False
4.
Write four examples of gaseous fuel.
5.
State True or False: Calorific value of methane is greater than that of biogas.
A)
true
B)
false
6.
Fill in the Blank: Wood, paper and CNG are _____________ substances.
7.
Which of the following has the highest calorific value?
A)
Petrol
B)
Diesel
C)
CNG
D)
LPG
8.
Choose the correct answer: Best domestic fuel for cooking is __________.
A)
wood
B)
coal
C)
CNG
D)
LPG
9.
Fill in the Blank: Burning of coal and diesel release __________________.
10.
Lpg is better domestic fuel than wood
A)
True
B)
False
11.
Oxygen is the product of any burning process
A)
True
B)
False
12.
State True or False: Glass is a combustible substance.
A)
true
B)
false
13.
Choose the correct answer: The gaseous fuel is __________.
A)
Petrol
B)
CNG
C)
Diesel
D)
Coal
14.
Which of the following is not used in fire extinguisher?
A)
carbon dioxide
B)
hydrogen
C)
potassium bicarbonate
D)
sodium bicarbonate
15.
Which of the following is not combustible?
A)
Petrol
B)
CNG
C)
paper
D)
alcohol
16.
State True or False: Fuels can be in solid, liquid or in gaseous form.
A)
true
B)
false
17.
State True or False: Carbon dioxide is the best fire extinguisher.
A)
true
B)
false
18.
Which of the following has the lowest ignition temperature?
A)
Coal
B)
Wood
C)
Petrol
D)
Mustard oil
19.
Choose the correct answer: The calorific value of am ideal fuel is ____________.
A)
zero
B)
very high
C)
moderate
D)
low
20.
Choose the correct answer: The hottest part in the flame of the candle is ____________.
A)
Yellow
B)
Red
C)
Blue
D)
Black
CBSE Class 8 Science Worksheet
Combustion and Flame
Answers
1.
Option D
2.
calorific value
3.
Option A
4.
LPG, CNG, Biogas, Hydrogen
5.
Option A
6.
combustible
7.
Option D
8.
Option D
9.
Sulphur dioxide
10.
Option A
11.
Option B
12.
Option B
13.
Option B
14.
Option B
15.
Option D
16.
Option A
17.
Option A
18.
Option C
19.
Option B
20.
Option D
