Q1
What is the SI unit of length?
AMetre
BKilogram
CSecond
DLitre
ICSEClass 8 (ICSE)ScienceCh 2 · Topic 2
Practice and Revision - Physical Quantities and Measurement
Let us practise and revise what we learned about physical quantities and measurement. Physical quantities are measured using standard SI uni
Core concept
The SI system includes base units like metre (length), kilogram (mass), and second (time), forming a consistent global measurement standard.
How it works
Precision instruments, like Vernier callipers and screw gauges, allow measurements more accurate than standard rulers, useful in scientific experiments.
Why it matters
Significant figures indicate the precision of a measurement, showing how many digits are reliably known.
Key detail
Accurate measurement is fundamental to scientific investigation, ensuring experiments can be replicated and results trusted.
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Quick notes
• SI units: metre, kilogram, second.
• These form a global measurement standard.
• Vernier callipers and screw gauges give precise measurements.
• They're more accurate than standard rulers.
• Significant figures show measurement precision.
• They indicate reliably known digits.
• Accurate measurement is fundamental to science.
• It ensures replicable, trustworthy experiments.