Lakhmir Singh and Manjit Kaur Solutions for Chapter: Sources of Energy, Exercise 20: Questions Based on High Order Thinking Skills (HOTS)

A certain form of energy is available due to the difference in the temperature of water at the surface of the ocean and its deeper levels.

Is this energy ultimately derived from the sun or not?

A certain form of energy is available due to the difference in the temperature of water at the surface of the ocean and its deeper levels.

Explain how this form of energy can be converted into electricity.

A certain form of energy is available due to the difference in the temperature of water at the surface of the ocean and its deeper levels. What is the minimum temperature difference (in $\mathrm{℃}$) in water at the surface of ocean and its deeper level which is required to operate power plants based on this energy?

The gravitational pull of the moon causes the sea-water to rise periodically.
What name is given to the condition of the sea when its water is raised?

The gravitational pull of the moon causes the sea-water to rise periodically.
What name is given to the condition of the sea when its raised water recedes?

The gravitational pull of the moon causes the sea-water to rise periodically. _____ energy is the energy that can be harnessed from this natural phenomenon.

The gravitational pull of the moon causes the sea-water to rise periodically.

Draw labelled diagram to show how this energy can be harnessed to generate electricity.

Name a certain form of energy which is not sourced directly or indirectly from the sun and does not cause any pollution. It is very easily converted into electricity. This form of energy is, however, not available everywhere. Moreover, it is technically very difficult and expensive to obtain.
(Solar energy/Geothermal energy/Tidal energy)