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Physical Quantities and Measurement — Chapter Summary

ICSE · Class 8 · Physics

Summary of Physical Quantities and Measurement for ICSE Class 8 Physics. 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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Overview

Physical quantities such as mass, volume, density, and relative density help describe matter in a scientific way. Density tells how much mass is packed into a given volume. Measurement of density is useful for regular solids, irregular solids, and liquids. The chapter also explains why some bodies f

Key Concepts

Density is the mass per unit

Density is the mass per unit volume of a substance. It is written as d = M / V. The SI unit is kg m⁻³ and the CGS unit is g cm⁻³. Density does not cha

Relative density is the ratio

Relative density is the ratio of the density of a substance to the density of water. It has no unit because it is a ratio of two similar quantities. I

The mass of a regular solid

The mass of a regular solid is measured using a beam balance. Its volume is found from its shape using formulas for cube, cuboid, sphere, or cylinder.

The volume of an irregular solid

The volume of an irregular solid is found by the displacement method. In a measuring cylinder, the rise in water level gives the volume of the solid.

The mass of a liquid

The mass of a liquid is found by weighing the container with and without the liquid. The volume is measured using a measuring cylinder or a density bo

Learning Objectives

  • Understand density as mass per unit volume
  • Use the formula d = M / V correctly with units
  • Convert between g cm⁻³ and kg m⁻³
  • Measure the density of regular solids using their dimensions
  • Measure the volume of irregular solids by the displacement method

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.

More resources for Physical Quantities and Measurement

All ICSE Class 8 Physics Chapter Summary

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