JST Physics Complete Notes | Roman Urdu Mein 15 Topics | MCQs aur Numerical Concepts

📘 JST Physics: Mukammal Notes (Roman Urdu) 12 MCQs – Full Syllabus

✅ Har topic ko subtopics mein divide kiya gaya hai. Har concept ko Roman Urdu mein aasan lafzon, real life examples aur numerical concepts ke saath samjhaya gaya hai. Mechanics se lekar Electronics tak – complete coverage.

📑 Physics ke tamam topics – Subtopics ke saath

1. Mechanics (Vectors, Kinematics, Dynamics) 2. Force & Torque 3. Momentum & Impulse 4. Laws of Motion (Newton) 5. Gravitation 6. Kinetic & Potential Energy 7. Thermal Physics & Scales 8. Gas Laws 9. Thermodynamics 10. Waves 11. Electromagnetism 12. Modern Physics 13. Light & Optics 14. Nuclear Physics 15. Electronics

⚙️ 1. Mechanics – Vectors, Kinematics, Dynamics

Mechanics kya hai? Physics ki woh branch jo objects ke motion aur forces se deal karti hai.

🔹 Vectors: Wo quantities jinme magnitude + direction ho (jaise displacement, velocity, force). Example: 5 km East.

🔹 Scalars: Sirf magnitude (mass, time, speed). Example: 50 kg.

🔹 Kinematics: Motion without forces. Equations: v = u + at, s = ut + ½at², v² = u² + 2as. Numerical example: Car 10 m/s se start kare, acceleration 2 m/s², 5 sec baad speed = 10+2×5 = 20 m/s.

🔹 Dynamics: Motion + forces. F = ma (Newton's 2nd law).

🔧 2. Force & Torque

Force: Push ya pull. Unit: Newton (N). F = m × a. Real life: Goli maarne par ball aage jaati hai.
Torque (τ): Rotational force. τ = r × F (distance × force). Real life: Spanner se nut kholna – jitna lamba spanner, utna aasan. Unit: Nm.

📌 Yaad rakhein: Torque max jab force perpendicular ho radius ke.

💥 3. Momentum & Impulse

Momentum (p): p = m × v. Mass × velocity. SI unit: kg m/s.
Impulse (J): Change in momentum = Force × time = m(v - u). Real life: Cricket ball ko catch karte waqt haath peeche karna – time badhata hai, force kam hoti hai.
Numerical: 2 kg ball 10 m/s se aa rahi, 0.1 sec mein rok di, Impulse = 2×(0-10)= -20 Ns, average force = Impulse/time = 200 N.

📜 4. Newton ke Laws of Motion

1st Law (Inertia): Object apni state change nahi karta jab tak external force na lage. Example: Bus brake lagne par aage girna.
2nd Law: F = m × a. Force = mass × acceleration.
3rd Law: Har action ke barabar opposite reaction. Example: Rocket propulsion.

🌍 5. Gravitation

Newton's Law: F = G × (m₁×m₂)/r². G = 6.67×10⁻¹¹ Nm²/kg².
g (acceleration due to gravity): 9.8 m/s². Weight = m×g.
Real life: Apple neeche girta hai, planets Sun ke around revolve karte hain.

⚡ 6. Kinetic & Potential Energy

Kinetic Energy (KE): ½ × m × v² – moving objects mein. Example: Running car.
Potential Energy (PE): m × g × h – height ki wajah se. Example: Pani tank mein upar rakha.
Numerical: 5 kg mass 10 m upar, PE = 5×9.8×10 = 490 J. Neeche aate waqt KE = PE (conservation of energy).

🌡️ 7. Thermal Physics – Temperature & Scales

Temperature: Heat ka measure. Scales: Celsius (°C), Fahrenheit (°F), Kelvin (K).
Conversions: K = °C + 273, °F = (9/5)×°C + 32.
Real life: Pani 100°C par ubalta hai, 0°C par jamta hai.

🎈 8. Gas Laws (Boyle's, Charles's, Ideal Gas)

Law	Formula	Real Life Example
Boyle's Law	P₁V₁ = P₂V₂ (constant T)	Syringe mein piston dabao – volume kam, pressure zyada
Charles's Law	V₁/T₁ = V₂/T₂ (constant P)	Garmi mein balloon failta hai
Ideal Gas Law	PV = nRT	R = 8.314 J/mol·K

🔥 9. Thermodynamics

Zeroth Law: Thermal equilibrium.
1st Law: ΔU = Q - W (Energy conservation). Heat in = internal energy + work done.
2nd Law: Entropy always increases. Heat naturally cold se hot mein nahi jaati.
Real life: Refrigerator – andar se heat bahar karta hai.

🌊 10. Waves – Types, Properties

Mechanical waves: Need medium (sound). Electromagnetic waves: No medium (light).
Formulas: v = f × λ (speed = frequency × wavelength).
Real life: Aankh se light waves, kaan se sound waves.

🧲 11. Electromagnetism

Oersted's discovery: Current carrying wire ke around magnetic field.
Faraday's Law: Changing magnetic field se current generate hoti hai (EMI).
Real life: Electric motor, generator, transformer.

⚛️ 12. Modern Physics – Photoelectric Effect, Relativity

Photoelectric Effect (Einstein): Light metal par girne se electrons emit hote hain. E = hf (Planck's equation).
Real life: Solar panels, automatic door sensors.

💡 13. Light & Optics

Reflection: Mirror – angle of incidence = angle of reflection.
Refraction: Light ka bend hona medium change par (Snell's law: n₁ sinθ₁ = n₂ sinθ₂).
Lenses: Convex (converging), Concave (diverging).
Real life: Specs, microscope, camera.

☢️ 14. Nuclear Physics

Radioactivity: Alpha (α), Beta (β), Gamma (γ) rays. Half-life: Substance ka half decay hone ka time.
Nuclear fission: Heavy nucleus tootna (atom bomb, nuclear power).
Nuclear fusion: Light nuclei milna (Sun's energy). E = mc² (mass energy equivalence).

📱 15. Electronics – Diodes, Transistors, Logic Gates

Diode: Current ek direction mein jaane deta hai (rectifier).
Transistor: Amplifier aur switch. Logic Gates: AND, OR, NOT – digital circuits mein.
Real life: Mobile phone, computer processor.

📝 JST Physics MCQs – Har topic se practice

1. Vector quantity ka example kya hai?

A) Mass B) Velocity C) Time D) Temperature

2. Newton ka second law kya kehta hai?

A) F = m/a B) F = ma C) F = mv D) F = mgh

3. Impulse ka formula kya hai?

A) mv B) F × t C) mgh D) ½mv²

4. g (gravity) ki standard value kya hai?

A) 10 m/s B) 9.8 m/s² C) 1.6 m/s² D) 0 m/s²

5. Kinetic energy ka formula kya hai?

A) mgh B) ½ mv² C) ma D) Fd

6. Absolute zero temperature kitni hoti hai?

A) 0°C B) 0 K ( -273°C ) C) 100°C D) 32°F

7. Boyle's law mein konsa relation constant hota hai?

A) V/T B) P×V C) P/T D) V/n

8. Sound wave kis type ki wave hai?

A) Electromagnetic B) Mechanical longitudinal C) Transverse D) Matter wave

9. Transformer kis principle par kaam karta hai?

A) Photoelectric B) Electromagnetic induction C) Reflection D) Refraction

10. Nuclear fusion kahan hota hai?

A) Atom bomb B) Sun C) Nuclear reactor D) X-ray machine

11. Convex lens kis kaam aati hai?

A) Diverging light B) Converging light C) Dispersion D) Reflection

12. Transistor ka primary use kya hai?

A) Rectification B) Amplification & switching C) Power generation D) Light emission

✅ Correct answers: 1-B, 2-B, 3-B, 4-B, 5-B, 6-B, 7-B, 8-B, 9-B, 10-B, 11-B, 12-B. Saare concepts upar detail mein samjhaaye gaye hain.

📌 Quick Revision – Physics Ke Zaroori Points

Main Topic	Key Formulas / Concepts
Kinematics	v = u+at, s = ut+½at², v²-u²=2as
Force & Torque	F=ma, τ = r×F
Momentum & Impulse	p=mv, Impulse = F×t = Δp
Energy	KE=½mv², PE=mgh, Conservation of energy
Gas Laws	Boyle: P₁V₁=P₂V₂, Charles: V₁/T₁=V₂/T₂, PV=nRT
Waves	v = fλ, mechanical vs EM waves
Electromagnetism	Faraday's law, Motor/Generator principle
Modern Physics	E=hf, Photoelectric effect
Nuclear Physics	E=mc², Half-life, Fission vs Fusion
Optics	Snell's law, Lens formula: 1/f = 1/v - 1/u

    🧠 Numerical Concepts Simplified: 
    
➤ Agar koi car 20 m/s se chal rahi hai aur brakes lagane par 4 m/s² deceleration hai, to rukne mein time = v/a = 20/4 = 5 seconds. Distance = v²/2a = 400/8 = 50 meters.
    
➤ 5 kg mass ko 10 m/sec ki speed se throw kiya to KE = ½×5×100 = 250 J.
    
➤ 100°C ko Kelvin mein convert: 100+273 = 373 K.
    
Har numerical ko step by step samjho – formula yaad rakho aur units check karo.

📖 Exam Tips: Newton ke laws, gas laws, energy conservation, wave formula v=fλ, aur thermodynamics ke laws sabse zyada important hain. Numericals mein units (m, kg, sec) hamesha standard rakhein.

JST Physics Complete Notes 2026 | 15 Topics Explained in Roman Urdu with Numericals & Examples