Short & Long Answer Questions: Energy-How Things Work | Our Wondrous World Class 5 - New NCERT PDF Download

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.