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Sources of Energy

Introduction

Understanding sources of energy is fundamental for exams like SSC CGL, RRB NTPC, and IBPS PO as it covers basic concepts of renewable and non-renewable energy, their uses, and environmental impact. Questions on this topic test knowledge of energy types, their origin, and applications in daily life and industry.

Pattern: Sources of Energy

Pattern

This pattern tests knowledge of different energy sources, their classification into renewable and non-renewable, and their practical uses.

Key Concept:

Energy sources are broadly classified as renewable (solar, wind, hydro, biomass, geothermal) and non-renewable (coal, petroleum, natural gas, nuclear).

Important Points:

  • Renewable Energy = Naturally replenished and sustainable over time.
  • Non-Renewable Energy = Finite resources that can be exhausted.
  • Fossil Fuels = Coal, petroleum, and natural gas formed from ancient organic matter.

Related Topics:

  • Environmental impact of energy sources
  • Energy conservation methods

Step-by-Step Example

Question

Which of the following is a renewable source of energy?

Options:

  • A. Coal
  • B. Petroleum
  • C. Solar Energy
  • D. Natural Gas

Solution

  1. Step 1: Identify the energy sources

    Coal, petroleum, and natural gas are fossil fuels and non-renewable.

  2. Step 2: Understand renewable energy

    Solar energy is derived from the sun and is continuously available.

  3. Step 3: Classify the options

    Only solar energy is renewable among the given options.

  4. Final Answer:

    Solar Energy → Option C

  5. Quick Check:

    Renewable energy = Solar Energy ✅

Quick Variations

This pattern may appear as questions on:

  • 1. Examples of renewable and non-renewable energy sources
  • 2. Advantages and disadvantages of different energy types
  • 3. Environmental effects of fossil fuels versus renewable energy

Trick to Always Use

  • Remember "SUN" for renewable energy: Solar, Underground heat (geothermal), Natural flows (wind, hydro)
  • Fossil fuels are always non-renewable and cause pollution

Summary

Summary

  • Energy sources are classified as renewable and non-renewable.
  • Renewable sources include solar, wind, hydro, biomass, and geothermal energy.
  • Non-renewable sources include coal, petroleum, natural gas, and nuclear energy.

Remember:
Renewable = Replenished naturally; Non-renewable = Finite (pollution depends on the source)

Practice

(1/5)
1. Which of the following is a non-renewable source of energy?
easy
A. Coal
B. Wind Energy
C. Solar Energy
D. Hydropower

Solution

  1. Step 1: Identify energy source types

    Non-renewable sources are finite and cannot be replenished quickly.

  2. Step 2: Classify the options

    Coal is a fossil fuel and non-renewable, while wind, solar, and hydropower are renewable.

  3. Final Answer:

    Coal → Option A

  4. Quick Check:

    Non-renewable energy = Coal ✅
Hint: Fossil fuels like coal are always non-renewable.
Common Mistakes: Confusing hydropower or wind as non-renewable due to infrastructure.
2. Which of the following energy sources is derived from the heat inside the Earth?
easy
A. Biomass Energy
B. Geothermal Energy
C. Nuclear Energy
D. Natural Gas

Solution

  1. Step 1: Understand geothermal energy

    Geothermal energy comes from the heat inside the Earth generated by radioactive decay and residual heat from formation.

  2. Step 2: Differentiate other options

    Biomass is organic matter, nuclear is from atomic reactions, natural gas is fossil fuel.

  3. Final Answer:

    Geothermal Energy → Option B

  4. Quick Check:

    Earth's internal heat = Geothermal Energy ✅
Hint: Geothermal = heat from Earth's interior.
Common Mistakes: Mistaking nuclear or natural gas as geothermal energy; confusing with sun's heat.
3. Which of the following is a clean and renewable source of energy that uses flowing water?
easy
A. Hydropower
B. Coal
C. Petroleum
D. Natural Gas

Solution

  1. Step 1: Identify energy from flowing water

    Hydropower uses the kinetic energy of flowing water to generate electricity.

  2. Step 2: Classify other options

    Coal, petroleum, and natural gas are fossil fuels and non-renewable.

  3. Final Answer:

    Hydropower → Option A

  4. Quick Check:

    Renewable energy from water = Hydropower ✅
Hint: Hydropower = energy from water flow.
Common Mistakes: Confusing hydropower with fossil fuels due to large dams.
4. Which of the following is a non-renewable source of energy that does NOT emit greenhouse gases during electricity generation?
medium
A. Natural Gas
B. Biomass
C. Coal
D. Nuclear Energy

Solution

  1. Step 1: Identify non-renewable energy sources

    Non-renewable energy sources include fossil fuels and nuclear energy.

  2. Step 2: Analyze greenhouse gas emissions

    Coal and natural gas emit greenhouse gases during use, while biomass also releases carbon dioxide when burned.

  3. Step 3: Evaluate nuclear energy

    Nuclear energy does not emit greenhouse gases during electricity generation.

  4. Final Answer:

    Nuclear Energy → Option D

  5. Quick Check:

    Non-renewable and no greenhouse gas emission during operation = Nuclear Energy ✅
Hint: Nuclear energy is non-renewable but does not release greenhouse gases during power generation.
Common Mistakes: Assuming all non-renewable energy sources emit greenhouse gases.
5. Which of the following is NOT a renewable source of energy?
medium
A. Biomass
B. Wind Energy
C. Natural Gas
D. Solar Energy

Solution

  1. Step 1: Recall renewable energy sources

    Renewable sources include biomass, wind, and solar energy.

  2. Step 2: Identify non-renewable source

    Natural gas is a fossil fuel and non-renewable.

  3. Final Answer:

    Natural Gas → Option C

  4. Quick Check:

    Non-renewable energy = Natural Gas ✅
Hint: Natural gas is fossil fuel, not renewable.
Common Mistakes: Confusing biomass as non-renewable due to organic origin.

Mock Test

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