Class 12 Biology

2025 Q1. Draw and explain the V-I characteristics of a PN junction diode in forward and reverse bias. Q2. Explain the working of a Zener diode as a voltage regulator.…

2025 Q1. Calculate the binding energy per nucleon of a nucleus with mass defect 0.008 u and mass number A = 4. Q2. Explain the Bohr model of the hydrogen atom…

2025 Q1. Derive the de Broglie wavelength of a particle moving with momentum p. Q2. A photon of wavelength 400 nm strikes a metal surface with work function 2 eV. Calculate the…

2025 Q1. Derive the mirror equation for a concave mirror and define the sign conventions. Q2. A thin convex lens of focal length f = 20 cm forms a real image…

2025 Q1. Explain the nature of electromagnetic waves and how electric and magnetic fields are oriented with respect to each other. Q2. Derive the wave equation for electromagnetic waves in…

2025 Q1. A coil of N turns and area A rotates in a uniform magnetic field B with angular speed ω. Derive the expression for induced EMF. Q2. Explain the…

2025 Q1. A long straight wire carries a current I. Derive an expression for the magnetic field at a point at distance r from the wire. Q2. A circular loop…

Chapterwise NEET Questions (2013–2025) 2013 A wire of uniform cross-section and length L has resistance R. If the wire is stretched to double its length without changing the volume, calculate…

2025 Two point charges q1q_1q1​ and q2q_2q2​ are placed 1 m apart in vacuum. The force between them is 9 N. If each charge is doubled and distance halved, what…

2025 A pipe open at both ends has a fundamental frequency f. If half its length is submerged in water, what will be the new fundamental frequency of the air…