Upthrust in Fluids and Archimedes Principle and Floatation
ICSE · Class 9 · Physics
Most important questions from Upthrust in Fluids and Archimedes Principle and Floatation for ICSE Class 9 Physics board exam 2026. MCQs, short answer, and long answer questions with marks.
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Which factors affect the magnitude of upthrust on a body?
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Volume of body submerged in fluid, Density of the fluid
Upthrust depends on two main factors: the volume of the body submerged in the fluid and the density of the fluid. Color, shape, and temperature don't directly affect upthrust.
Relative density has:
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No unit
Relative density is a ratio of two densities, so it has no unit. It's the ratio of density of substance to density of water at 4°C.
A cork floats on water because:
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Its density is less than water
Cork floats because its density (0.24 g/cm³) is less than water's density (1 g/cm³). This means upthrust exceeds its weight when partially submerged.
When a body is completely immersed in water, the upthrust is:
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Maximum
When a body is completely immersed, maximum volume of fluid is displaced, giving maximum upthrust. Partial immersion gives less upthrust.
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