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Burning in the presence of oxygen, in order to produce heat and light is called
“Substance that undergo combustion are called combustible substance”
Substances which do not undergo combustion are called
What will happen if candle is kept completely isolated from the oxygen?
“A burning charcoal is covered with a jar” Choose the correct option for the given situation.
The minimum temperature at which a substance catch fire is known as _______
Which of the following is necessary condition for condition?
Choose which of the following is type of combustion
Rapid combustion occurs when _______
Choose correct option for spontaneous combustion
Burning of crackers are example of _______ type of combustion
Yellow phosphorus _______ for combustion
Choose correct option from the following
Ignition temperature is _______
Substance which easily catches fire when exposed to flame are called inflammable substance
Which of the following is the way to control fire?
Arrange the following in correct order-
a. Vaporization of wax
b. Formation of flame
c. Melting of wax
Charcoal does not form flame because
Which is the hottest part of the flame?
in which part temperature of the flame is coolest
In which zone vapor undergoes partial combustion
Color of flame in illumination zone is
Temperature of illumination zone is _______
Choose the correct pair among the following –
a. blue zone – complete combustion
b. dark zone – vapors are unburnt
c. illumination zone – incomplete combustion
The blue zone of flame undergoes ______
Substance that produce large amount of energy is called fuel
Find the odd man out
Choose the incorrect pair
Choose the correct option among the following
Calorific value is
Unit of calorific value is
Choose the correct option with respect to calorific value
Among the given option which of the following will you choose as good fuel?
Which of following properties must be present in good fuel?
Burning of wood releases _______ and _______ in air
Incomplete combustion of fuel produces
“Carbon monoxide is poisonous gas, it so harmful that it can cause death.” Given statement is _______
To maintain the temperature of earth _______ is necessary
Greenhouse effect is resulting into _______
Acid rain is caused due to release of _______ and _______ in air.
Blackening of Taj Mahal is result of
Instead of using petrol and diesel, we can use _______ to prevent acid rain
One should use CNG because _______
Which of the following is not consequences of acid rain?
Solar energy is trapped by gases like ______ to show greenhouse effect