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Comprehensive IIT JEE Notes For beginners.

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Comprehensive IIT JEE Notes: A Complete Guide to Excel in the Exam Description: Are you aspiring to crack the prestigious Indian Institutes of Technology Joint Entrance Examination (IIT JEE)? Look no further! Our Comprehensive IIT JEE Notes provide a well-structured and comprehensive guide to...

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  • August 2, 2023
  • 59
  • 2022/2023
  • Class notes
  • Nitin vijay
  • 11 to 12
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𝐹𝑃𝑆

[𝑀0 𝐿𝑇 −2 ]
Welcome to 𝑘𝑔


NOTES
Physical world and
Units & Measurements

𝑚𝑜𝑙
𝐶𝐺𝑆
𝑀𝐾𝑆

, Physical Quantities

• Represent Quantities from Physical World.

• They should be measurable directly or indirectly by an instrument.

• Can be expressed by a numerical value followed by a unit.

𝑃𝑄 = 𝑛 × 𝑢


Which of these are physical quantities ?
1. The density of brass is 8.4 𝑔Τ𝑐𝑚3
2. The relative density of alcohol is 0.8
3. The mass of an empty bottle is 21.8 𝑔
4. The velocity of a moving train is 50 𝑘𝑚Τℎ

A B
1 and 4 1, 3 and 4

C D
1, 2, 3 and 4 1, 2 and 3

, Unit


Unit is a reference standard used to compare and measure a physical quantity.

𝑢


unit



System of units Mass – Length – Time


CGS centimetre – gram – second

FPS foot – pound – second

MKS meter – kilogram – second

, Unit


Prefixes Factor Prefixes Factor


yotta 1024 centi 10−2

zetta 1021 milli 10−3

exa 1018 micro 10−6
peta 1015 nano 10−9
tera 1012 pico 10−12
giga 109 femto 10−15

mega 106 atto 10−18
kilo 103 zepto 10−21
deci 10−1 yocto 10−24

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