Pressure in Fluids and Atmospheric Pressure
ICSE · Class 9 · Physics
Most important questions from Pressure in Fluids and Atmospheric Pressure for ICSE Class 9 Physics board exam 2026. MCQs, short answer, and long answer questions with marks.
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Which of the following factors affect the pressure at a point in a liquid? (Select all correct answers)
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Depth of the point below free surface, Density of the liquid, Acceleration due to gravity
Pressure in a liquid depends on depth (h), density (ρ), and acceleration due to gravity (g) as shown in P = hρg. The shape and area of container do not affect pressure at a point.
Pascal's law states that pressure applied to a confined liquid is transmitted equally in all directions.
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True
Pascal's law correctly states that pressure exerted anywhere in a confined liquid is transmitted equally and undiminished in all directions throughout the liquid. This principle is used in hydraulic machines.
Which of the following are applications of Pascal's law? (Select all correct answers)
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Hydraulic press, Hydraulic jack, Hydraulic brakes
Hydraulic press, hydraulic jack, and hydraulic brakes all work on Pascal's law principle of pressure transmission. A simple barometer works on atmospheric pressure, not Pascal's law.
Why is the wall of a dam made thicker at the bottom?
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Because water pressure increases with depth
According to P = hρg, water pressure increases with depth. Therefore, the dam wall experiences maximum pressure at the bottom and needs to be thicker to withstand this greater pressure.
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