Lakshya Education MCQs

Question: 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?
D.Compressed Natural Gas (CNG)
Answer: Option D
: D

There is probably no fuel that could be considered as an ideal fuel. We should look for a fuel which fulfils most of the requirements for a particularuse. Compressed Natural Gas (CNG) contains methane which doesn't produce a large amount of toxicgases or residue that pollute the environment. It is also easily combustible.Of the given options it is closest to being an ideal fuel.

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More Questions on This Topic :

Question 1. Which of the following is not a component of a fire triangle?
  1.    Oxygen
  2.    Nitrogen
  3.    Fuel
  4.    Heat
Answer: Option B
: B

A fire triangle is a simple modelfor understanding the necessary ingredients for production of fire. Thetriangleillustrates the three elements afireneeds to ignite: heat, fuel, and oxygen. Nitrogen gas does notsupport combustion. The image below shows a fire triangle.
Question 2. What is the unburnt material that is present in a fuel, e.g. wood?
  1.    Ash
  2.    Coal
  3.    Coke
  4.    Carbon
Answer: Option A
: A

Ash is the solid residue of a fuel. It is the material that is left unburnt at the end of combustion. Its chemical composition does not contain carbon.
Question 3. Every substance that burns produces flames.
  1.    True
  2.    False
  3.    Potassium chlorate
  4.    Graphite
Answer: Option B
: B

Substances produce flames while burning, only if it vapourises during the process.
For example, molten wax risesthrough the wick and isvapourised during burning. So, theyform flames.
Charcoal, on the other hand, does not vaporise. So,it does not produce any flame.
Hence, the above statement is false.
Question 4. The efficiency of a fuel is expressed in terms of its ________.
  1.    calorific value
  2.    density
  3.    purity
  4.    volume
Answer: Option A
: A

Fuel efficiency isexpressed in terms of calorific value and its unit iskilojoule per kg. It is the amount of heat produced on complete combustion of 1kg of a fuel.

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