Test: Heat Transfer in Nature - Class 7 MCQ

A sea breeze happens when the land gets hotter than the sea, causing warm air to rise from the land. This creates a low-pressure area, and cooler air from the sea rushes in to fill it, creating a refreshing breeze.

At night, the land cools faster than the sea. The cooler air from the land moves toward the warmer sea, creating a land breeze.

Excessive extraction of groundwater can lead to depletion, where the water level decreases because it is being used faster than it can be replenished.

Convection happens when heated water becomes less dense and rises, while cooler, denser water sinks, creating a cycle that distributes heat through the liquid.

Precipitation occurs when water in clouds falls to the Earth as rain, snow, or hail, completing part of the water cycle.

Air is a poor conductor of heat, so it helps trap body warmth between layers of clothing, keeping you warm in cold weather.

When a liquid is heated, its particles move faster, becoming less dense and rising. This creates convection currents, spreading heat throughout the liquid.

Convection currents occur when warm fluid rises and cooler fluid sinks, creating a circular motion that helps transfer heat.

Iron is a good conductor of heat, meaning heat passes through it easily, making it useful for cooking and heating purposes.

Woolen fabrics trap air between their fibers, and since air is a poor conductor of heat, it keeps body warmth from escaping.

Radiation is the transfer of heat in the form of electromagnetic waves, which is how heat from a fire reaches you.

Temperature affects the rate of evaporation. The higher the temperature, the more water evaporates, contributing to the water cycle.

Conduction happens when heat moves through a material because heated particles pass their energy to neighboring particles.

Radiation transfers heat through electromagnetic waves and does not require a material medium (like air or water), such as heat from the Sun reaching Earth.

Smoke rises because it consists of hot gases and small particles that are less dense than the surrounding cooler air.

Conduction is responsible for transferring heat through direct contact, such as when a hot pan heats up the food inside it.

The ice stupa melts slowly during spring, providing water for farming and other needs throughout the summer

The water cycle moves water through evaporation, condensation, and precipitation, ensuring water is distributed and replenished around the Earth.

Rainwater harvesting captures rainwater to store it for later use, helping to replenish groundwater supplies and conserve water.

An insulator is a material that prevents heat from flowing through it easily. Examples include wood and glass, used in making insulated containers or walls.