Heat Transfer in Nature Class 7 Short Question Answer

Heat Transfer in Nature Class 7 Short Question Answer

Heat Transfer in Nature Class 7 Short Question Answer

Question 1.

Explain how the Sun contributes to the water cycle.

Answer:

The Sun heats water in oceans, rivers, and lakes, causing it to evaporate into water vapour. This vapour rises, cools, and condenses to form clouds, which eventually lead to precipitation.

Question 2.

Describe the difference between land breeze and sea breeze.

Answer:

A sea breeze occurs during the day when cooler air from the sea moves towards the warmer land. Conversely, a land breeze occurs at night when cooler air from the land moves towards the warmer sea.

Question 3.

What is convection and how does it occur in water?

Answer:

Convection is the transfer of heat through the movement of particles in a fluid. In water, when heated, the water expands, becomes lighter, and rises, while cooler, denser water sinks, creating a cycle.

Question 4.

Describe the water cycle and its importance.

Answer:

The water cycle is the continuous movement of water through evaporation, condensation, precipitation, and collection. It is essential for replenishing water sources, supporting ecosystems, and maintaining the balance of water on Earth.

Question 5.

How do land and sea breezes illustrate the concept of convection?

Answer:

Land and sea breezes are examples of convection where the temperature difference between land and sea creates pressure differences. During the day, the land heats up faster, causing air to rise and cooler air from the sea to move in, creating a sea breeze. At night, the process reverses, leading to a land breeze.

Question 6.

Explain the process of evaporation and its role in the water cycle.

Answer:

Evaporation is the process where liquid water is converted into water vapour due to heat from the Sun. This water vapour rises into the atmosphere, where it cools and condenses into ćlouds, eventually leading to precipitation, thus continuing the water cycle.