Chapter 2: Units and Measurement
JAC Board Class 11 Physics
Updated: May 2026 | 12 Questions | 15 Minutes | +4 sahi | -1 galat
Chapter ki baat
Physical quantity: Jise measure kar sakte ho. Jaise length, mass, time, temperature.
Unit: Kisi bhi physical quantity ka standard measurement. Jaise meter length ka unit hai.
SI system: Duniya bhar mein use hota hai. 7 base units hain.
Fundamental vs Derived: Fundamental independent hote hain. Derived fundamental se bante hain (speed = length/time).
Significant figures: Kisi measurement mein kitne digits reliable hain. Jaise 5.67 mein 3 significant figures.
SI base units
| Physical Quantity | Unit Name | Symbol |
|---|---|---|
| Length | meter | m |
| Mass | kilogram | kg |
| Time | second | s |
| Electric Current | ampere | A |
| Temperature | kelvin | K |
| Amount of Substance | mole | mol |
| Luminous Intensity | candela | cd |
Dimensional formulae
Force → [M L T⁻²]
Work / Energy → [M L² T⁻²]
Power → [M L² T⁻³]
Pressure → [M L⁻¹ T⁻²]
Momentum → [M L T⁻¹]
Density → [M L⁻³]
Speed → [L T⁻¹]
Galtiyan jo students karte hain
Galti 1: Kilogram ko fundamental unit nahi samajhna. Asal mein kilogram fundamental unit hai.
Galti 2: Candela ka symbol "cd" nahi likhna. "cd" hi likhna hai, C ya CD nahi.
Galti 3: Force aur pressure ka dimensional formula mix kar lena. Force [M L T⁻²], Pressure [M L⁻¹ T⁻²].
Galti 4: Significant figures mein trailing zeros ko count karna bhool jaate hain. Jaise 5.00 mein 3 significant figures.
Galti 5: Light year ko time ka unit samajh lena. Light year distance ka unit hai.
Online Test - Units and Measurement
12 questions hain, 15 minutes ka time milega. Negative marking bhi hai.
Rules:
- Sahi jawab pe 4 number, galat pe 1 number cut
- Test ke beech refresh mat karna
- Finish button dabane ke baad result dikhega
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