SSC CHSL 2025 PYQ — Question 87

The correct answer option is (Option 1): Pressure = Force / Area.
Explanation:
In physics, pressure is a physical quantity that represents the force acting perpendicularly per unit area of ​​a surface.
Its mathematical formula is as follows:
P = F/A
Where:
• P = Pressure
• F = Force
• A = Area
Key Facts Related to Pressure:
• Relationship with Area: Pressure is inversely proportional to area. This means that if the force remains constant while the area is reduced, the pressure increases. This is why school bag straps are made wide—to minimize the pressure exerted on the shoulders.
• SI Unit: The SI unit of pressure is Newtons per square meter (N/m²), which is also known as the Pascal (Pa) in honor of the great scientist Blaise Pascal.
• Nature of Quantity: Pressure is a scalar quantity.
Examples in Daily Life:
1. Pointed Nails: The tip of a nail is made pointed (small surface area) so that the force applied by a hammer is concentrated over a tiny region, generating high pressure; this allows the nail to penetrate the wood easily.
2. Camels Walking in Deserts: Camels have wide feet, which distributes their weight over a larger surface area and reduces the pressure exerted on the sand; consequently, their feet do not sink into the sand.
Important Questions for Upcoming Examinations:
• Question: What is 1 Pascal (Pa) equal to?
o Answer: 1 N/m².
• Question: Which instrument is used to measure atmospheric pressure?
o Answer: Barometer.
• Question: What is the effect on the pressure of a liquid as depth increases?
o Answer: The pressure of a liquid increases as the depth increases.