# Olympiad Test: Combustion And Flame - 2

## 15 Questions MCQ Test Science Olympiad Class 8 | Olympiad Test: Combustion And Flame - 2

Description
Attempt Olympiad Test: Combustion And Flame - 2 | 15 questions in 40 minutes | Mock test for Class 8 preparation | Free important questions MCQ to study Science Olympiad Class 8 for Class 8 Exam | Download free PDF with solutions
QUESTION: 1

Solution:
QUESTION: 2

### For combustion to take place, we need

Solution:

Three things are required in proper combination before ignition and combustion can take place---Heat, Oxygen and Fuel.

• There must be Fuel to burn.
• There must be Air to supply oxygen.
• There must be Heat (ignition temperature) to start and continue the combustion process.
QUESTION: 3

### To extinguish a flame, which of these methods is used?

Solution:
QUESTION: 4

The combustion in which a material bursts into flames without the application of heat is called

Solution:
QUESTION: 5

Which of these material represents spontaneous combustion?

Solution:
QUESTION: 6

Which of these is a solid pollutant?

Solution:
QUESTION: 7

SPM, also called dangerous pollutants, means

Solution:
QUESTION: 8

The coldest zone of flame is –––– zone.

Solution:
QUESTION: 9

In which zone is carbon monoxide burns with a blue colour at the base of the wick?

Solution:

Blue zone: This is due to the combustion of incompletely combusted carbon-monoxide.

QUESTION: 10

The SI unit of calorific value is

Solution:
QUESTION: 11

The calorific value of petrol is

Solution:

The calorific value of diesel fuel is roughly 45.5 MJ/kg (megajoules per kilogram), slightly lower than petrol which is 45.8 MJ/kg.

QUESTION: 12

A fuel is considered good if it

Solution:
QUESTION: 13

Burning of magnesium is an example of which combustion?

Solution:
QUESTION: 14

The most commonly used fire extinguisher is soda-acid fire extinguisher. Cylinder is filled with a solution of

Solution:
QUESTION: 15

Which of these is gaseous fuel?

Solution:
 Use Code STAYHOME200 and get INR 200 additional OFF Use Coupon Code