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📘 StudyBeacon - Class 10 Board Examination Subject: Mathematics (CBSE Pattern) Name: Roll No: ⏳ Time Left: 60:00 Submit Exam 🎓 Print Result Explore More 🧭

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🧪 Class 12 Chemistry – Full 50 MCQ Test (30 Minutes) Time Left: 30:00 Q1. Number of atoms in BCC unit cell? 1 2 3 4 Q2. Highest melting solid? Ionic Molecular Metallic Covalent network Q3. Schottky defect decreases density? True False Q4. Coordination number of FCC? 4 6 8 12 Q5. Packing efficiency of BCC? 52% 68% 74% 84% Q6. Unit of molality? mol/L mol/kg g/L g/kg Q7. Law relating vapour pressure and mole fraction? Henry’s Law Raoult’s Law Dalton’s Law Ostwald’s Law Q8. Van’t Hoff factor of NaCl? 1 2 3 4 Q9. Colligative properties depend on? Nature of solute Nature of solvent Number of solute particles Temperature only Q10. Osmosis occurs through? Metal sheet Porous membrane Semi-permeable membrane Rubber membrane Q11. Unit of molar conductivity? S cm² mol⁻¹ S cm⁻¹ Ω cm Ω⁻¹ Q12. Standard potential of SHE? 1 V 0 V –1 V 0.5 V Q13. ...

Alternating Current (AC) – Complete Formula Framework (JEE Mains) Phasors | Impedance | Resonance | Power | PYQ Mapping 1️⃣ AC Basics Alternating current: \[ i = I_0 \sin \omega t \] Peak current = \( I_0 \) Angular frequency = \( \omega = 2\pi f \) Time period = \( T = \frac{2\pi}{\omega} \) RMS value: \[ I_{rms} = \frac{I_0}{\sqrt{2}} \] \[ V_{rms} = \frac{V_0}{\sqrt{2}} \] ⚠ Mains Trap: Household voltage is RMS, not peak. 2️⃣ AC through Pure Resistor Voltage & current in phase \[ V = IR \] Power: \[ P = V_{rms} I_{rms} \] Phase angle: \[ \phi = 0 \] 3️⃣ AC through Pure Inductor Inductive reactance: \[ X_L = \omega L \] Current: \[ I = \frac{V}{X_L} \] Phase: \[ \phi = +90^\circ \] Voltage leads current. 4️⃣ AC through Pure Capacitor Capacitive reactance: \[ X_C = \frac{1}{\omega C} \] Current: \[ I = \frac{V}{X_C} \] Phase: \[ \phi = -90^\circ \] Current leads voltage. 5️⃣ RLC Series Circuit Imped...

Class 12 Chemistry – Aldehydes, Ketones & Carboxylic Acids (MCQ Quiz) 50 Most Important Questions • CBSE ⏱ Total Time: 00:00 ⏳ Q Time: 00 s 🎯 Accuracy: 0% Next Explore More 🧭

Class 12 Chemistry – Alcohols, Phenols & Ethers (MCQ Quiz) 50 Most Important Questions • CBSE ⏱ Total Time: 00:00 ⏳ Q Time: 00 s 🎯 Accuracy: 0% Next Explore More 🧭

Class 12 Chemistry – Haloalkanes & Haloarenes (MCQ Quiz) 50 Most Important Questions • CBSE ⏱ Total Time: 00:00 ⏳ Q Time: 00 s 🎯 Accuracy: 0% Next Explore More 🧭

Class 12 Chemistry – d-Block & f-Block Elements (MCQ Quiz) 50 Most Important Questions • CBSE ⏱ Total Time: 00:00 ⏳ Q Time: 00 s 🎯 Accuracy: 0% Next Explore More 🧭

Class 12 Chemistry – Coordination Compounds (MCQ Quiz) 50 Most Important Questions • CBSE ⏱ Total Time: 00:00 ⏳ Q Time: 00 s 🎯 Accuracy: 0% Next Explore More 🧭

Class 12 CBSE  Chemistry – Chemical Kinetics (PYQ MCQ Quiz) 50 Most Important Previous Year Questions • CBSE ⏱ Total Time: 00:00 ⏳ Q Time: 00 s 🎯 Accuracy: 0% Next Explore More 🧭