JAC Class 12 Physics Question Paper 2013 with Solution

About this paper

This is the Jharkhand Academic Council (JAC) Class 12 Physics paper from the 2013 board examination, with an answer written under every question. It has 27 questions: five one-mark multiple-choice questions, seven two-mark questions, twelve three-mark questions and three five-mark questions, totalling 70 marks. Each five-mark question offers an alternative. The long answers cover the energy stored in a capacitor or Gauss's theorem for a charged spherical shell, the field of a bar magnet or the force between parallel currents, and Huygens' principle or the lens maker's formula. The three-mark questions include the hydrogen spectrum, the Zener diode regulator and sky and space wave propagation.

Exam

JAC Class 12

Subject

Physics

Year

2013

Maximum marks

70

Questions

27

Pages

7

Answers included

Yes

Paper pattern

• Questions 1–5

  5 marks

  Objective multiple-choice questions, one mark each

• Questions 6–12

  14 marks

  Short answer questions, two marks each

• Questions 13–24

  36 marks

  Short answer questions, three marks each

• Questions 25–27

  15 marks

  Long answer questions, five marks each, each with an alternative

Topics covered

• Electric charges, fields and Gauss's theorem
• Capacitors and energy density
• Current electricity and cells
• Biot–Savart and Ampère's circuital law
• Magnetism and bar magnets
• Electromagnetic induction and AC circuits
• Electromagnetic waves
• Ray optics, lenses and defects of vision
• Wave optics and Huygens' principle
• Photoelectric effect and matter waves
• Bohr model and radioactive decay
• Semiconductor devices and communication

Questions from this paper

1. Using Ampère's circuital law, find the magnetic field at a point outside a very long straight current-carrying wire.
2. Find the relation between critical angle and refractive index.
3. Explain the reddish appearance of the sky at sunrise and sunset.
4. The work function of a metal surface is 1.2 eV. Calculate the kinetic energy of the fastest and slowest photoelectrons and the retarding potential when light of frequency 5.5 × 10¹⁴ Hz falls on the surface (h = 6.62 × 10⁻³⁴ J s).
5. What is a Zener diode? How can it be used as a voltage regulator?
6. Find the energy stored in a capacitor. Using it, find the energy density of a parallel plate capacitor.