1.
During an explosion a large amount of …………is given out
2.
Which gas is produced on complete combustion of a substance?
3.
Magnesium burns in air to form
4.
Unit of measuring calorific value
5.
Which of the following fuel has lowest calorific values
6.
Incomplete combustion of fuel produces
7.
Combustion of coal gas is an example of
8.
Which of the following cannot be used to extinguish fire caused due to oil spill
9.
The zone of partial combustion is
10.
A flame always points upwards because
12.
Which of the following does not produce a flame
13.
Which fuel is pollution free?
14.
Combustion occurs in the presence of which gas
15.
The substance which gives heat and light after combustion is called
16.
The calorific value of a fuel is expressed in a unit called
17.
The fine particles of unburnt carbon cause which disease
19.
CNG and LPG are examples of
20.
Sun produces heat and light through
21.
This part of the flame is the hottest part of the flame
22.
When a wax candle burns, flame gives
23.
When combustion occurs unburnt carbon particles are produced. These particles are harmful, as they cause
