CBSE Class 10 Science Notes Chapter 14 Sources of Energy

CBSE Class 10 Science Notes - Chapter 14: Sources of Energy

Types of Energy Sources:
- Renewable sources: Can be replenished, such as solar, wind, hydro, geothermal, and biomass.
- Non-renewable sources: Finite resources like coal, petroleum, and natural gas.
Conventional vs. Non-conventional Energy:
- Conventional: Coal, oil, and natural gas.
- Non-conventional: Wind, solar, tidal, geothermal, etc.
Energy Conservation: Using energy efficiently and reducing waste.
Solar Energy: Solar panels convert sunlight into electricity. Clean and renewable.
Wind Energy: Harnessing wind to generate power through turbines.
Biogas: A clean and renewable source produced from organic matter.

This chapter focuses on energy conservation, types, and environmental concerns associated with energy sources.

Most Important Science Class 10 Questions Answers For Board Examination

Here are the top questions and answers from Chapter 14 (Sources of Energy) of CBSE Class 10 Science that have appeared in the last five board exams:

What are renewable and non-renewable sources of energy?
- Renewable: Energy sources that can be regenerated, e.g., solar, wind, and hydro.
- Non-renewable: Finite energy sources like coal, petroleum, and natural gas.
Why is solar energy considered a clean source of energy?
- Solar energy is pollution-free, abundant, and renewable, making it environmentally friendly.
Explain the working principle of a windmill.
- Windmills convert the kinetic energy of wind into mechanical energy through turbine blades.
What is biogas, and how is it produced?
- Biogas is produced from the anaerobic digestion of organic waste by bacteria, and it is a clean source of energy.
What are the advantages of using renewable energy sources?
- They are sustainable, reduce dependency on fossil fuels, and have minimal environmental impact.

Here are some MCQs based on Chapter 14 (Sources of Energy) of CBSE Class 10 Science:

Which of the following is a renewable source of energy?
- a) Coal
- b) Wind
- c) Petroleum
- d) Natural Gas
  Answer: b) Wind
Which energy source is most commonly used in nuclear power plants?
- a) Solar
- b) Coal
- c) Uranium
- d) Wind
  Answer: c) Uranium
Which of the following is not an advantage of solar energy?
- a) Renewable
- b) Pollution-free
- c) Expensive installation cost
- d) Efficient
  Answer: c) Expensive installation cost
What is biogas mainly composed of?
- a) Methane
- b) Carbon dioxide
- c) Oxygen
- d) Nitrogen
  Answer: a) Methane
In a windmill, the kinetic energy of the wind is converted into:
- a) Electrical energy
- b) Heat energy
- c) Chemical energy
- d) Nuclear energy
  Answer: a) Electrical energy