Physical Quantities and Measurement
ICSE · Class 6 · Physics
Flashcards for Physical Quantities and Measurement — ICSE Class 6 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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Explore the full setWhat is a physical quantity?
Answer
A physical quantity is any quantity that can be measured. Examples include length, mass, time, and temperature. These are measured using standard units like metre, kilogram, second, and degree Celsius…
Why can't we rely only on our senses for measurement?
Answer
Our senses like touch or sight are subjective and can vary from person to person. For example, one person may feel water as warm while another feels it as hot. So, we use standard instruments like rul…
What are the two things needed for any measurement?
Answer
Every measurement requires: (1) A number (n) that tells how many times, and (2) A unit (u) which is a standard of comparison. So, Measurement = n × u. For example, 5 metres means 5 times the unit 'met…
What is the S.I. unit of length?
Answer
The S.I. unit of length is the metre (symbol: m). It is used worldwide to measure distances, heights, and lengths of objects.
Convert 2.5 km into metres.
Answer
We know: 1 km = 1000 m. So, 2.5 km = 2.5 × 1000 = 2500 m. Answer: 2500 m.
Convert 450 cm into metres.
Answer
We know: 100 cm = 1 m. So, 450 cm = 450 ÷ 100 = 4.5 m. Answer: 4.5 m.
What are the submultiples of a metre?
Answer
The submultiples of a metre are: (1) Centimetre (cm): 1 cm = 1/100 m = 0.01 m, (2) Millimetre (mm): 1 mm = 1/1000 m = 0.001 m.
How many millimetres are there in 1 centimetre?
Answer
There are 10 millimetres in 1 centimetre. So, 1 cm = 10 mm.
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