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Units and Measurements — Flashcards

ICSE · Class 11 · Physics

60 flashcards for Units and Measurements (ICSE Class 11 Physics) to test yourself on key terms and facts. Part of the ICSE Class 11 Physics syllabus.

42 questions60 flashcards5 formulas & key relations5 concepts

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A clear comparison table distinguishing fundamental physical quantities and their base units from derived physical quantities and their derived units, with examples for each.
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60 Flashcards·
Physical quantitiesNeed for measurementFundamental quantitiesSI base unitsUnit conversionSystems of unitsSI advantages
Card 1Physical quantities

State the meaning of a physical quantity.

Answer

A quantity linked to a physical phenomenon and subjected to measurement is called a physical quantity. Examples: length, mass, time, force, speed.

Card 2Need for measurement

Why is physics called a science of measurement?

Answer

Physics depends on measuring quantities like distance, mass, time, force, and speed to describe natural phenomena clearly in numbers. Without measurement, description remains incomplete.

Card 3Fundamental quantities

What are fundamental quantities in mechanics?

Answer

Length, mass, and time are fundamental quantities in mechanics. Their units are fundamental units because they cannot be derived from one another.

Card 4SI base units

State the SI base units for length, mass, and time.

Answer

Length = metre (m), mass = kilogram (kg), time = second (s).

Card 5Unit conversion

State the unit-numerical value invariance relation.

Answer

n1(u1) = n2(u2). It means the product of numerical value and unit remains constant when the unit changes.

Card 6Unit conversion

A length is 20 m. What is it in cm and mm?

Answer

Given: 20 m. 1 m = 100 cm, so 20 m = 20 × 100 cm = 2000 cm. Also, 1 m = 1000 mm, so 20 m = 20 × 1000 mm = 20000 mm. Answer: 2000 cm or 20000 mm.

Card 7Systems of units

What is the SI and metric status of CGS, MKS, FPS, and SI?

Answer

CGS, MKS, and SI are metric systems. FPS is a non-metric British system and is rarely used.

Card 8SI advantages

State two reasons why SI is preferred.

Answer

SI is rational, meaning one unit is used for one physical quantity. SI is coherent, meaning derived units are obtained without numerical factors.

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Frequently Asked Questions

What are the important topics in Units and Measurements for ICSE Class 11 Physics?
Key topics in Units and Measurements include Need for Measurement and Physical Quantities, Fundamental Units, Derived Units, and Systems of Units, Definitions of Important SI Units, Units of Large and Small Lengths. Study these first, then practise questions on each for Class 11 exams.
How many flashcards are available for Units and Measurements?
There are 60 flashcards for Units and Measurements covering key definitions, facts and ideas. A few sample cards are shown on this page.
How should I revise Units and Measurements for Class 11 exams?
Learn the core ideas first, then work through the 42 practice questions on Units and Measurements. 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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