With reference to the Pressure, consider the following statements:

1. A column of air exerts weight in terms of pressure on the surface of the earth.

2. The weight of the column of air at a given place and time is called air pressure or atmospheric pressure.

3. Atmospheric pressure is measured as force per unit area.

Which of the following statement given above is/are correct?

  1. 1 and 2 only
  2. 2 and 3 only
  3. 1 and 3 only
  4. 1, 2, and 3
1, 2, and 3

Correct Answer: Option 4 : 1, 2, and 3

Key Points

  • A column of air exerts weight, creating pressure on surfaces.
  • The weight of this air column at a specific location is referred to as air pressure or atmospheric pressure.
  • Atmospheric pressure is quantified as force applied per unit area, typically measured in Pascals (Pa).

Why Other Options Are Wrong

  • Option 1 (1 and 2 only) is incorrect because it omits the correct statement about atmospheric pressure being measured as force per unit area.
  • Option 2 (2 and 3 only) is incorrect as it excludes the first statement, which is fundamental to understanding how air pressure is generated.
  • Option 3 (1 and 3 only) is incorrect since it does not include the second statement, which defines air pressure specifically.

Quick Tip for Exam

When studying concepts like atmospheric pressure, remember that all three statements are interconnected. Understanding how air pressure is defined and measured is crucial for questions related to physics and general science.

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