Short Answer Questions
Q1: What is energy and its everyday uses?
Ans: Energy makes things move, light up, or heat. It’s used in cooking, vehicles, and lights, coming from sources like food or the sun.
Q2: How does food provide energy?
Ans: Food fuels living things for movement and growth. Skipping meals causes tiredness, while eating restores activity.
Q3: Explain solar energy with an example.
Ans: Solar energy from sunlight powers panels for electricity. It dries clothes or warms water naturally, being clean and renewable.
Q4: What are fuels and their types?
Ans: Fuels like petrol for vehicles or gas for cooking provide energy. They burn to release heat, but can pollute if overused.
Q5: How is wind energy generated?
Ans: Wind spins windmills to produce electricity. It’s clean, used historically in sails for ships across seas.
Q6: What is Vaastu Shastra?
Ans: An ancient Indian system of designing buildings with nature for natural light and wind, reducing energy needs.
Q7: Why are LED bulbs energy-efficient?
Ans: LEDs use less electricity for the same light as older bulbs. They save resources and reduce bills.
Q8: How do batteries store energy?
Ans: Batteries hold chemical energy for devices like torches. They provide portable power without constant electricity.
Q9: What is kinetic energy?
Ans: It’s energy from movement, like running water turning mills or wind spinning turbines for grinding grains.
Q10: How do animals provide heat energy in Ladakh?
Ans: Cattle kept on ground floors warm homes above with body heat, a natural way to stay cosy in cold winters.
Long Answer Questions
Q1: Describe different sources of energy and their importance.
Ans: Energy is essential for human civilisation, powering homes, industries, transportation, and technology.
- Sources include sun (solar for panels), wind (for mills), water (for hydropower), food (for living beings), and fuels (for vehicles).
- They enable movement, light, and heat essential for life.
- Clean sources like solar reduce pollution, while fuels like gas aid cooking.
- Understanding storage in batteries promotes efficiency.
- Wise use ensures sustainability for future needs.
Q2: Explain the benefits of clean energy sources like solar and wind.
Ans: Clean energy sources like solar and wind offer numerous benefits, contributing to environmental, economic, and social advancements. Below is a concise explanation of their key advantages, written in clear and accessible language:
- Solar panels generate electricity from sunlight without smoke, powering homes cleanly.
- Windmills use air movement for power, reducing fossil fuel dependence.
- Both are renewable, cutting pollution and costs.
- In India, they support rural areas and ancient practices like Vaastu for natural harmony.
- Adopting them combats climate change and promotes eco-friendly living.
Q3: Discuss safety rules for using electricity.
Ans: Following safety rules for using electricity is essential to prevent accidents and ensure a secure environment.
- Avoid touching plugged wires or sockets, report broken poles, and never play near transformers.
- Efficiency, like using LEDs, saves energy.
- Dangers include shocks or fires, so unplug during storms.
- Education on these prevents accidents, ensuring safe use in homes and schools.
- Following the rules protects lives and conserves resources.
Q4: How does energy from nature work in daily life, with examples?
Ans: Energy from nature, such as solar, wind, and hydropower, powers daily life by providing sustainable electricity and supporting essential activities.
- Sun provides heat for drying and solar power, wind for pinwheels or mills, and water for wheels grinding grains.
- In Ladakh, animal heat warms houses.
- These natural sources are clean and ancient, like ships using the wind.
- Activities show vibration for sound or focus for burning, teaching sustainable uses without harming the environment.
Q5: What is the role of stored energy, and how can we save it?
Ans: Stored energy plays a crucial role in powering daily life by providing a reliable supply when natural sources like sunlight or wind are unavailable, and saving it involves efficient use and conservation strategies.
- Stored in batteries for torches or bodies from food for activity, it ensures availability without constant sources.
- Saving involves turning off lights, using LEDs, and natural designs like Vaastu.
- Efficiency reduces waste, like the brain using energy even at rest.
- Small actions like unplugging devices conserve energy for the future, promoting responsible global energy use.