EASY
8th Foundation
IMPORTANT
Earn 100

Read the given statements and select the correct option.
Statement 1 : Phosphorus burns in air at room temperature.
Statement 2 : It is an example of spontaneous combustion.

50% studentsanswered this correctly

Important Questions on Combustion and Flame

EASY
8th Foundation
IMPORTANT
NSO Science Olympiad Workbook Grade 8>Chapter 6 - Combustion and Flame>EXERCISES>Q 4
Colours of flame produced by kerosene Iamp, candle and Bunsen burner are respectively:
EASY
8th Foundation
IMPORTANT
NSO Science Olympiad Workbook Grade 8>Chapter 6 - Combustion and Flame>EXERCISES>Q 5
Global warming leads to a rise in the sea level causing floods in the coastal areas. One of the main reasons for global warming is:
EASY
8th Foundation
IMPORTANT
NSO Science Olympiad Workbook Grade 8>Chapter 6 - Combustion and Flame>EXERCISES>Q 6

Read the given statements and select the correct option.

Statement 1: Kerosene oil and wood do not catch fire on their own at room temperature.

Statement 2: A combustible material cannot catch fire as long as its temperature is lower than its ignition temperature.

MEDIUM
8th Foundation
IMPORTANT
NSO Science Olympiad Workbook Grade 8>Chapter 6 - Combustion and Flame>EXERCISES>Q 7
In an experiment, 4.5 Kg of a fuel was completely burnt. The heat produced was 180,000 kJ. The calorific value of the fuel is:
EASY
8th Foundation
IMPORTANT
NSO Science Olympiad Workbook Grade 8>Chapter 6 - Combustion and Flame>EXERCISES>Q 8
What is the principle of soda fire extinguisher?
EASY
8th Foundation
IMPORTANT
NSO Science Olympiad Workbook Grade 8>Chapter 6 - Combustion and Flame>EXERCISES>Q 9
Which of the following reactions takes place in soda-acid type fire extinguisher?
MEDIUM
8th Foundation
IMPORTANT
NSO Science Olympiad Workbook Grade 8>Chapter 6 - Combustion and Flame>EXERCISES>Q 10

Match column I with column II and select the correct option from the given codes.

Column I Column II
P.  Rusting  (i)   Explosion
Q.  Burning of paper (ii)  Spontaneous combustion
R.  Sodium (iii)  Rapid combustion
S.  Fire crackers (iv)   Slow combustion

 

EASY
8th Foundation
IMPORTANT
NSO Science Olympiad Workbook Grade 8>Chapter 6 - Combustion and Flame>EXERCISES>Q 11
Which of the following represents the correct increasing order of calorific value of the given fuels?