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Units and Measurements

ICSE · Class 11 · Physics

Flashcards for Units and Measurements — ICSE Class 11 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.

42 questions60 flashcards5 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
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 Units and Measurements - Concept Overview, Flowchart showing which direct measurement instrument to use based on the size and type of object being measured, Flowchart comparing different unit systems and showing the progression toward SI as the universal standard. These are the concepts ICSE Class 11 examiners draw on most — study them first, then practise related questions.
How to score full marks in Units and Measurements — ICSE Class 11 Physics?
Understand the core concepts first, then work through the 42 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many flashcards are available for Units and Measurements?
There are 60 flashcards for Units and Measurements covering key definitions, formulas, and concepts. Use them daily for 10–15 minutes for best results.

Sources & Official References

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

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