Fill in the following blanks with suitable words :
(a) LPG is a ........... fuel but biogas is not a..........fuel.
(b) Glaciers are a source of .............
(c) One of the main aim of management of forests and wildlife is to conserve the ........... which we have inherited.
(d) Khadin is a traditional ............... harvesting system in Rajasthan.
(e)When a fuel burns in an insufficient supply of air, then some poisonous gas called ......... is also produced.

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Solution

a) LPG is a fossil fuel but biogas is not a fossil fuel.
(b) Glaciers are a source of water.
(c) One of the main aim of management of forests and wildlife is to conserve the biodiversity, which we have inherited.
(d) Khadin is a traditional rainwater harvesting system in Rajasthan.
(e)When a fuel burns in an insufficient supply of air, then some poisonous gas called carbon monoxide is also produced.

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Fill in the following blanks with suitable words:
(a) LPG is a ______ fuel but biogas is not a ______ fuel.
(b) Glaciers are a source of ______
(c) One of the main aims of the management of forests and wildlife is to conserve the ______ which we have inherited.
(d) Khadin is a traditional ______ harvesting system in Rajasthan.
(e) When a fuel burns in an insufficient supply of air, then some poisonous gas called ______ is also produced.

Q. Which gas is produced when a fuel burns in
(a) sufficient supply of air
(b) insufficient supply of air.

Fill in the following blanks with suitable words :

(a) Fossil fuels are ___ , ___ and ___ .

(b) Coal contains mainly ___ .

(d) The process of separation of different constituents from petroleum is called ___ .

(e) The least polluting fuel for vehicles is ___ .

(f) The burning of fossil fuels causes air ___ and also leads to global ___ .

Fill in the following blanks with suitable words :

(a) A fuel must be heated to its___ before it starts burning.

(b) The most common supporter of combustion around us is___

(d) A liquid fuel used in homes is___

(e) The amount of heat evolved when 1 kg of a fuel is burnt completely is called its___

(f) The substances which vaporise during burning, give___

(g) Burning of wood and coal causes___ of air.

Q. When the material A mined from the earth is heated strongly in an insufficient supply of air, it produces a solid fuel B which consists mainly of carbon. When another material C obtained from trees is heated in an insufficient supply of air, it produces another solid fuel D which also consists mainly of carbon. Name A, B, C and D

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