With reference to the movement of air, consider the following statements: 1. Moving air is called wind. 2. Wind is generally too weak to uproot trees or blow off rooftops. 3. Windmills operate without the need for moving air. Which of the statements given above is/are correct?

The correct option is (a). Explanation Air is a mixture of gases surrounding the Earth. The horizontal movement of air, driven by differences in atmospheric pressure, is defined as wind. Wind possesses kinetic energy, which varies based on its speed. Statement-wise Analysis: - Statement 1 is Correct: Moving air is scientifically termed wind. It flows from areas of high pressure to areas of low pressure. - Statement 2 is Incorrect: While a gentle breeze is weak, wind can attain very high speeds (as seen in storms and cyclones). High-speed winds possess significant kinetic energy capable of uprooting trees, blowing off rooftops, and causing structural damage. - Statement 3 is Incorrect: Windmills operate on the principle of converting the kinetic energy of moving air into mechanical or electrical energy. They require wind to rotate their blades; they cannot function in still air. Key Takeaway: Wind is moving air that possesses kinetic energy. This energy is utilized in technologies like windmills but can be destructive at high velocities.

With reference to the movement… - NCERT Class 6 Environment & Ecology MCQ

NCERT Class 6 Environment & Ecology — Chapter 2: Air around us

mcqeasy

With reference to the movement of air, consider the following statements:

Moving air is called wind.
Wind is generally too weak to uproot trees or blow off rooftops.
Windmills operate without the need for moving air.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT Science - class 6 · Page 147

Options

A1 only
B2 only
C1 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (a).

Explanation

Air is a mixture of gases surrounding the Earth. The horizontal movement of air, driven by differences in atmospheric pressure, is defined as wind. Wind possesses kinetic energy, which varies based on its speed.

Statement-wise Analysis:

Statement 1 is Correct: Moving air is scientifically termed wind. It flows from areas of high pressure to areas of low pressure.
Statement 2 is Incorrect: While a gentle breeze is weak, wind can attain very high speeds (as seen in storms and cyclones). High-speed winds possess significant kinetic energy capable of uprooting trees, blowing off rooftops, and causing structural damage.
Statement 3 is Incorrect: Windmills operate on the principle of converting the kinetic energy of moving air into mechanical or electrical energy. They require wind to rotate their blades; they cannot function in still air.

Key Takeaway:
Wind is moving air that possesses kinetic energy. This energy is utilized in technologies like windmills but can be destructive at high velocities.

Your note

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