Q1
What is the SI unit of length?
AMetre
BKilogram
CSecond
DLitre
ICSEClass 8 (ICSE)ScienceCh 2 · Topic 1
Physical Quantities and Measurement
Physical quantities are measured using standard SI units, and precision instruments help us measure length, mass, and time accurately.
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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• 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.