Question 14
Choose the incorrect statement from the following. A good fuel is one which:

(a) is readily available.
(b) produces a large amount of heat.
(c) leaves behind many undesirable substances.
(d) burns easily in the air at a moderate rate.

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Solution

The answer is (c).
A good fuel does not produce any harmful gases or leaves any residue after burning.

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Q. Question 14
Choose the incorrect statement from the following. A good fuel is one which:

(a) is readily available.
(b) produces a large amount of heat.
(c) leaves behind many undesirable substances.
(d) burns easily in the air at a moderate rate.

Q. Choose the incorrect statement from the following.

A good fuel is one which:

Q. Hydrogen burning in the presence of oxygen produces a large amount of heat, even then it is a clean fuel.

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.

An ideal fuel is cheap, readily available, easily combustible and easy to transport. It has high calorific value. It does not produce gases or residues that pollute the environment.

Based on the above statements which of the following is closest to being an ideal fuel?

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Question 14 Choose the incorrect statement from the following. A good fuel is one which: (a) is readily available. (b) produces a large amount of heat. (c) leaves behind many undesirable substances. (d) burns easily in the air at a moderate rate.

The answer is (c). A good fuel does not produce any harmful gases or leaves any residue after burning.

Question 14
Choose the incorrect statement from the following. A good fuel is one which:

(a) is readily available.
(b) produces a large amount of heat.
(c) leaves behind many undesirable substances.
(d) burns easily in the air at a moderate rate.

The answer is (c).
A good fuel does not produce any harmful gases or leaves any residue after burning.