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Class 8 Practice – Level 2 – Set 2 – Combustion and Flame
Total questions: 25
1.
Which part of the candle flame is responsible for the production of soot?
Outer blue zone
Dark inner zone
Yellow luminous zone
Non-luminous zone
None
2.
What is the primary reason why electrical fires should not be extinguished with water?
Water evaporates too quickly
Water does not cool the fire
Water can conduct electricity and cause shocks
Water is flammable
None
3.
Which of the following is a consequence of using fossil fuels for energy?
Increased oxygen levels
Depletion of natural gas reserves
Global cooling
Release of sulfur dioxide, causing acid rain
None
4.
In which of the following situations would spontaneous combustion occur?
Lighting a matchstick
A pile of oily rags left in a warm room
Cooking food on a stove
A burning candle
None
5.
Why is a powder-based fire extinguisher effective for flammable metal fires?
It absorbs heat
It cools the fire
It forms a barrier between the metal and oxygen
It releases carbon monoxide
None
6.
Which of the following materials has a higher ignition temperature?
Paper
Petrol
Wood
Kerosene
None
7.
Which characteristic of a flame determines its temperature?
Color
Size
Shape
Height
None
8.
Which of the following is NOT a product of complete combustion of carbon-based fuels?
Water
Carbon monoxide
Carbon dioxide
Heat
None
9.
Which of the following safety measures is most effective in preventing a fire caused by an electrical short circuit?
Using water to cool the circuit
Installing a circuit breaker
Adding more wires
Keeping the appliances turned on all the time
None
10.
Which of the following fuels has the lowest calorific value?
LPG
Wood
Petrol
CNG
None
11.
Which of the following gases is released in significant amounts during the incomplete combustion of fuels?
Nitrogen
Carbon monoxide
Oxygen
Helium
None
12.
Why is the non-luminous blue flame in a Bunsen burner more efficient than the luminous yellow flame?
It produces more soot
It results in incomplete combustion
It is cooler in temperature
It uses more oxygen and has complete combustion
None
13.
Which of the following actions should be avoided during a fire caused by flammable liquids?
Using a fire blanket
Using water to douse the flames
Using sand to cover the flames
Using a foam extinguisher
None
14.
Which substance is formed when coal burns incompletely due to insufficient oxygen?
Carbon dioxide
Water vapor
Carbon monoxide
Hydrogen gas
None
15.
Why does kerosene oil catch fire more easily than wood?
It has a higher calorific value
It evaporates easily
It has a lower ignition temperature
It contains more oxygen
None
16.
Which characteristic makes hydrogen an ideal fuel for the future?
Low calorific value
Non-polluting nature
Slow combustion
High availability in pure form
None
17.
What is the role of a fire alarm system in fire safety?
To suppress the fire
To detect fire and alert occupants
To provide water to extinguish the fire
To increase ventilation
None
18.
Which of the following flames indicates the highest temperature?
Yellow flame
Orange flame
Red flame
Blue flame
None
19.
Which of the following situations may lead to spontaneous combustion?
A gas stove burning continuously
Charcoal in an enclosed space
A matchstick in contact with oxygen
Wet leaves in the sun
None
20.
Which property makes diesel less efficient compared to CNG in terms of pollution?
Higher ignition temperature
Lower calorific value
Higher production of pollutants
Lower availability
None
21.
Which of the following fuels is typically used in a gas turbine engine?
Petrol
Diesel
Natural gas
Wood
None
22.
Which of the following is an effective method to extinguish a fire caused by flammable gases?
Using a foam extinguisher
Using a CO₂ extinguisher
Pouring water over the flames
Using a fire blanket
None
23.
Which condition is necessary for an explosion to occur?
A high supply of oxygen
A slow burning of fuel
A sudden release of heat, light, and sound
Low pressure surrounding the fuel
None
24.
Why is petrol used as a fuel in cars instead of wood?
Petrol has a lower calorific value than wood
Petrol has a lower ignition temperature
Petrol is more abundant
Wood evaporates quickly
None
25.
Which of the following pollutants is associated with the combustion of coal?
Ozone
Chlorine
Sulfur dioxide
Methane
None
1 out of 25
Time's up
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