JKBOSE Class 12 Physics Guess Paper
Prepared based on the latest syllabus and exam trends. Focus on high-weightage topics and frequently asked questions.
Unit I: Electrostatics (8 Marks)
1. Short Answer (2 Marks)
Derive the expression for electric field due to an electric dipole at a point on its axial line.
2. Numerical (3 Marks)
Calculate the capacitance of a parallel plate capacitor with a dielectric slab inserted.
3. Long Answer (5 Marks)
State Gauss’s Law. Use it to find the electric field due to a uniformly charged spherical shell.
Unit II: Current Electricity (7 Marks)
1. Very Short Answer (1 Mark)
Define temperature coefficient of resistance.
2. Numerical (3 Marks)
Use Kirchhoff’s Laws to calculate current in a given circuit.
3. Long Answer (5 Marks)
Explain the working of a meter bridge to determine unknown resistance.
Unit III: Magnetic Effects of Current & Magnetism (8 Marks)
1. Short Answer (2 Marks)
Derive the force per unit length between two parallel current-carrying conductors.
2. Numerical (3 Marks)
Calculate the magnetic field at the center of a circular coil using Biot-Savart Law.
3. Long Answer (5 Marks)
Describe the working of a cyclotron with a labeled diagram.
Unit IV: Electromagnetic Induction & AC (10 Marks)
1. Short Answer (2 Marks)
Explain why the core of a transformer is laminated.
2. Numerical (3 Marks)
Calculate the RMS value of alternating current.
3. Long Answer (5 Marks)
Derive the expression for instantaneous emf in an AC generator.
Unit V: Electromagnetic Waves (4 Marks)
1. Very Short Answer (1 Mark)
Name the electromagnetic waves used in satellite communication.
2. Short Answer (2 Marks)
Explain displacement current.
Unit VI: Optics (10 Marks)
1. Numerical (3 Marks)
Use Lens Maker’s Formula to calculate focal length.
2. Long Answer (5 Marks)
Derive the expression for fringe width in Young’s double-slit experiment.
Unit VII: Dual Nature of Radiation & Matter (6 Marks)
1. Short Answer (2 Marks)
State laws of photoelectric emission.
2. Numerical (3 Marks)
Calculate the de Broglie wavelength of an electron.
Unit VIII: Atoms & Nuclei (8 Marks)
1. Numerical (3 Marks)
Calculate the half-life of a radioactive substance.
2. Long Answer (5 Marks)
Explain the working of a nuclear reactor with a diagram.
Unit IX: Semiconductor Devices (7 Marks)
1. Short Answer (2 Marks)
Draw the circuit diagram of a full-wave rectifier.
2. Long Answer (5 Marks)
Explain the working of a transistor as a switch.
Unit X: Communication Systems (6 Marks)
1. Short Answer (2 Marks)
Explain the need for modulation.
2. Long Answer (5 Marks)
Describe the process of amplitude modulation.
