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Physical Quantities and Measurement — Revision Notes

ICSE · Class 8 · Physics

Physical Quantities and Measurement revision notes for ICSE Class 8 Physics: 4 topics in quick points. Part of the ICSE Class 8 Physics syllabus.

45 questions30 flashcards9 formulas & key relations5 concepts

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An illustration comparing three scenarios: an object floating, sinking, and remaining fully submerged (just floating) in a liquid, based on the relative densities of the object and the liquid.
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Key Topics to Revise

1

Density and Its Units

  • Density is mass per unit volume.
  • Density is represented by the symbol d.
  • Density does not change with change in shape or size of a substance.
2

Measurement of Density of Solids and Liquids

  • Mass of a regular solid is measured using a beam balance.
  • Volume of a cube = (one side)³.
  • Volume of a cuboid = length × breadth × height.
3

Relative Density

  • Relative density is the ratio of the density of a substance to the density of water.
  • Relative density is represented by R.D.
  • Relative density has no unit and no dimension.
4

Floatation, Buoyant Force, and Applications

  • A body in a liquid experiences an upward force called buoyant force or upthrust.
  • Buoyant force equals the weight of the liquid displaced by the immersed part of the body.
  • Buoyant force depends on the volume of the body immersed and the density of the liquid.

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Full Notes

Key Concepts

Density is the mass per unitRelative density is the ratioThe mass of a regular solidThe volume of an irregular solidThe mass of a liquid

Frequently Asked Questions

What are the important topics in Physical Quantities and Measurement for ICSE Class 8 Physics?
Key topics in Physical Quantities and Measurement include Density and Its Units, Measurement of Density of Solids and Liquids, Relative Density, Floatation, Buoyant Force, and Applications. Study these first, then practise questions on each for Class 8 exams.
How should I revise Physical Quantities and Measurement for Class 8 exams?
Learn the core ideas first, then work through the 45 practice questions on Physical Quantities and Measurement. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All ICSE Class 8 Physics Revision Notes

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