📘 Title: CET Physics – Units and Dimensions Formula Sheet 🖊️ By: Sarthak Patil

 🔹 Introduction:

Units आणि Dimensions हे CET आणि NEET दोन्ही परीक्षांमध्ये खूप महत्त्वाचं टॉपिक आहे. यातून दरवर्षी 1–2 प्रश्न हमखास विचारले जातात. चला तर मग बघूया महत्वाचे Units, Dimensions आणि Short Tricks!

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📚 Basic Physical Quantities and SI Units:

Length → metre (m) → [L]

Mass → kilogram (kg) → [M]

Time → second (s) → [T]

Current → ampere (A) → [I]

Temperature → kelvin (K) → [θ]

Amount of substance → mole → [N]

Luminous Intensity → candela (cd) → [J]

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📐 Derived Quantities with Dimensions:

Velocity = Distance / Time → [LT⁻¹]

Acceleration = Velocity / Time → [LT⁻²]

Force = Mass × Acceleration → [MLT⁻²]

Work = Force × Distance → [ML²T⁻²]

Power = Work / Time → [ML²T⁻³]

Pressure = Force / Area → [ML⁻¹T⁻²]

Density = Mass / Volume → [ML⁻³]

Momentum = Mass × Velocity → [MLT⁻¹]

Impulse = Force × Time → [MLT⁻¹]

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📌 Dimensionless Quantities:

Angle (radian) = arc / radius

Refractive Index = c / v

Strain = ΔL / L

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💡 Quick Tips:

• Formula वापरून dimensions derive कर

• Dimensions match करून formula verify कर

• Derived units → base units मध्ये convert कर

• Dimensionless quantities ला unit नसतो!

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🔚 Conclusion:

Units आणि Dimensions हे topic फक्त theory नव्हे – तर numerical problems साठी foundation असतो. दररोज 5 min revision ठेवलं, तर हे chapter तुमचं full scoring बनेल!

Thanks for reading!

– Sarthak Patil