Heat Transfer in Nature Class 7 Long Question Answer

Heat Transfer in Nature Class 7 Long Question Answer

Heat Transfer in Nature Class 7 Long Question Answer

Question 1.

Explain the process of the water cycle and its significance in nature.

Answer:

The water cycle involves the continuous,movement of water through evaporation, condensation, and precipitation. Water r evaporates from oceans, rivers, and lakes due to solar heat, transforming into water vapour. This vapour cools and condenses to form clouds, leading to precipitation in the form of rain or snow. The water cycle is crucial as it redistributes and replenishes water resources, maintaining ecological balance and supporting life.

Question 2.

Describe how land and sea breezes occur and their impact on coastal climates.

Answer:

Land and sea breezes are caused by the differential heating of land and water. During the day, land heats up faster than the sea, creating a low-pressure area over the land. Cooler air from the sea moves in to replace it, forming a sea breeze. At night, the land cools faster, and the warmer air over the sea rises, creating a land breeze. These breezes moderate coastal temperatures, preventing extreme heat and cold.

Question 3.

Discuss why metals are preferred for cooking utensils in terms of heat transfer.

Answer:

Metals are preferred for cooking utensils because they are excellent conductors of heat. When heated, metals transfer heat quickly and evenly, allowing food to cook uniformly. This efficient heat conduction reduces cooking time and energy consumption. Additionally, metals can withstand high temperatures, making them suitable for various cooking methods, ensuring safety and durability in the kitchen.