Combustion and Flame

What is majorly essential for combustion?
1. Carbon dioxide
2. Methane
3. Nitrogen
4. Oxygen
The substances which burn in the presence of oxygen are called______
1. Renewable substances
2. Combustible substances
3. Solid substances
4. inexhaustible substances
The substances which have very low ignition temperature are:
1. Inflammable substances
2. Flammable substances
3. Water made substances
4. None of these
What can be used to control fire from electrical equipments, among the following?
1. Sand
2. Water
3. Class C fire extinguisher
4. Both (A) and (C)
A combustion that takes place rapidly, with the production of heat and light is called____
1. Spontaneous combustion
2. Explosion
3. Rapid combustion
4. None of these
Thr process of combustion in which large amount of gases are evolved with the production of tremendous amount of heat, light and sound is called_______
1. Spontaneous combustion
2. Rapid combustion
3. Explosion
4. None of these
The amount of heat energy produced on complete combustion of 1kg of fuel is called its_________
1. Fuel efficiency
2. Calorific value
3. Ignition value
4. None of these
The zone which contains vapours of fuels and unburnt carbon particles is:
1. Dark zone
2. Benthic zone
3. Luminous zone of flame
4. Non-luminous zone of flame
The fuel which fulfills all the requirements for a particular use is called ___________
1. Non-ideal fuel
2. Ideal fuel
3. Impure fuel
4. None of these
Which of the following do you think can be used as for controlling fire?
1. Water, kerosene, sand and petrol.
2. Water, sand, fire extinguishers and kerosene.
3. Water, sand, fire extinguishers and Carbon dioxide.
4. None of these.