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Fuels Used in Daily Life

Introduction

Understanding the types of fuels used in daily life is essential for exams like SSC CGL, RRB NTPC, and IBPS PO. Questions often focus on the classification, properties, and uses of common fuels such as coal, petroleum, LPG, and biogas.

Pattern: Fuels Used in Daily Life

Pattern

This pattern tests knowledge of different fuels, their sources, properties, and common applications in households and industries.

Key Concept:

Fuels are substances that release energy on combustion. They can be solid, liquid, or gaseous and are classified as conventional (coal, petroleum, natural gas) and non-conventional (biogas, ethanol).

Important Points:

  • Coal = Solid fossil fuel mainly used in thermal power plants and industries.
  • Petroleum = Liquid fossil fuel refined into petrol, diesel, kerosene, etc.
  • LPG (Liquefied Petroleum Gas) = Gaseous fuel used for cooking and heating.
  • Biogas = Renewable gaseous fuel produced by anaerobic decomposition of organic waste.

Related Topics:

  • Combustion and Energy
  • Renewable and Non-renewable Energy Sources
  • Environmental Impact of Fuels

Step-by-Step Example

Question

Which of the following fuels is renewable and commonly produced by the anaerobic decomposition of organic waste?

Options:

  • A. Coal
  • B. Petroleum
  • C. Biogas
  • D. LPG

Solution

  1. Step 1: Identify fuel types

    Coal and petroleum are fossil fuels and non-renewable.

  2. Step 2: Understand fuel origin

    Biogas is produced by anaerobic decomposition of organic matter, making it renewable.

  3. Step 3: Eliminate other options

    LPG is a fossil fuel derivative and not renewable.

  4. Final Answer:

    Biogas → Option C

  5. Quick Check:

    Renewable fuel from waste = Biogas ✅

Quick Variations

This pattern may appear as questions on:

  • 1. Differences between solid, liquid, and gaseous fuels
  • 2. Uses of various fuels in daily life and industries
  • 3. Environmental effects of using different fuels

Trick to Always Use

  • Remember: "Coal and Petroleum are fossil fuels; Biogas is from waste."
  • Mnemonic for fuel states: "Solid Coal, Liquid Petrol, Gas LPG/Biogas."

Summary

Summary

  • Fuels release energy by combustion and are classified by physical state and origin.
  • Coal and petroleum are non-renewable fossil fuels; biogas is renewable.
  • LPG is a gaseous fossil fuel commonly used for cooking.

Remember:
“Fossil fuels are finite; biogas is infinite and eco-friendly.”

Practice

(1/5)
1. Which of the following is a liquid fossil fuel commonly used as petrol and diesel after refining?
easy
A. Coal
B. Petroleum
C. Biogas
D. LPG

Solution

  1. Step 1: Identify fuel states

    Coal is solid, biogas and LPG are gaseous fuels, petroleum is liquid.

  2. Step 2: Understand refining process

    Petroleum is refined to produce petrol, diesel, kerosene, etc.

  3. Final Answer:

    Petroleum → Option B

  4. Quick Check:

    Liquid fossil fuel refined to petrol = Petroleum ✅
Hint: Remember: Liquid fuel for vehicles is petroleum.
Common Mistakes: Confusing LPG (gas) with petroleum (liquid).
2. Which fuel is primarily used in households for cooking and is stored in cylinders?
easy
A. LPG
B. Petroleum
C. Coal
D. Biogas

Solution

  1. Step 1: Identify common household fuels

    Coal is solid and mainly used in industries; petroleum derivatives are liquid fuels.

  2. Step 2: Recognize gaseous fuels for cooking

    LPG (Liquefied Petroleum Gas) is a gaseous fuel stored in cylinders and widely used for cooking.

  3. Final Answer:

    LPG → Option A

  4. Quick Check:

    Household cooking fuel in cylinders = LPG ✅
Hint: LPG = Cooking gas in cylinders.
Common Mistakes: Mistaking biogas for LPG due to both being gases.
3. Which of the following fuels is renewable and produced by the anaerobic decomposition of organic waste?
easy
A. Biogas
B. Petroleum
C. Coal
D. Kerosene

Solution

  1. Step 1: Differentiate renewable and non-renewable fuels

    Coal, petroleum, and kerosene are fossil fuels and non-renewable.

  2. Step 2: Understand biogas origin

    Biogas is produced by anaerobic decomposition of organic waste, making it renewable.

  3. Final Answer:

    Biogas → Option A

  4. Quick Check:

    Renewable fuel from waste = Biogas ✅
Hint: Biogas = Renewable gas from organic waste.
Common Mistakes: Confusing kerosene (fossil fuel) with biogas.
4. Which of the following is NOT a fossil fuel?
medium
A. Coal
B. Petroleum
C. Biogas
D. Natural Gas

Solution

  1. Step 1: Define fossil fuels

    Fossil fuels are formed from ancient organic matter over millions of years.

  2. Step 2: Identify each fuel's origin

    Coal, petroleum, and natural gas are fossil fuels; biogas is produced from recent organic waste.

  3. Final Answer:

    Biogas → Option C

  4. Quick Check:

    Non-fossil fuel among options = Biogas ✅
Hint: Biogas is renewable, unlike fossil fuels.
Common Mistakes: Assuming natural gas and biogas are the same.
5. Which fuel among the following has the highest energy content per unit mass?
medium
A. Coal
B. Wood
C. Biogas
D. Petrol

Solution

  1. Step 1: Understand energy content of fuels

    Energy content varies; liquid fuels generally have higher energy density than solids or gases.

  2. Step 2: Compare typical energy values

    Petrol has higher calorific value (~44 MJ/kg) compared to coal (~24 MJ/kg), wood (~16 MJ/kg), and biogas (~21 MJ/m³ but gaseous).

  3. Final Answer:

    Petrol → Option D

  4. Quick Check:

    Highest energy per mass = Petrol ✅
Hint: Petrol has higher calorific value than coal or wood.
Common Mistakes: Assuming coal has more energy than petrol due to solid state.

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