Final Questions — All-Book

All chapters together · Total: 50 marks

A. Fill in the blanks (6 marks)

1. Coal, oil and gas are called fuels.
2. Solar cells are made mainly from , which comes from sand.
3. In a generator, spinning near copper coils make electricity.
4. Heat energy from inside the Earth is called energy.
5. The rise and fall of the sea caused mostly by the Moon is called a .
6. The network that carries electricity across India is called the power .

B. True or False (6 marks)

1. Wind turbines use electricity to make wind. ( ___ )
2. One unit of electricity can light a 10-watt LED for 100 hours. ( ___ )
3. Solar panels work best on bright, sunny days. ( ___ )
4. Biogas is made from coal. ( ___ )
5. Batteries let us use solar energy at night. ( ___ )
6. India already makes all its electricity from clean sources. ( ___ )

C. Choose the correct option (6 marks)

1. The world's first fully solar-powered airport is in — (a) Kochi (b) Jaipur (c) Pune
2. Muppandal is famous for — (a) tides (b) wind turbines (c) coal mines
3. The leftover from a biogas plant is used as — (a) fuel for cars (b) fertiliser (c) paint
4. A micro hydro plant uses — (a) a stream (b) the Sun (c) diesel
5. Photovoltaic cells turn — (a) wind into heat (b) light into electricity (c) water into gas
6. India's goal is to reach net zero by — (a) 2030 (b) 2050 (c) 2070

D. Match the columns (6 marks)

E. Answer in short (10 marks)

1. Explain how a solar cell makes electricity.
2. Why are wind turbines built very tall?
3. Give two advantages of biogas over firewood.
4. Why do we need batteries and a power grid for clean energy?
5. Write any three ways your family can save electricity.

F. Answer in detail — any TWO (16 marks)

1. Imagine you are the energy minister of your state. Which two clean energy sources would you choose and why?
2. Retell the story of any two children from this book and explain what each one learnt about clean energy.
3. Write a letter to a friend explaining why India is moving from coal to clean energy. Include one fact and one thing that still needs to be done.