JAC Class 12 Physics Question Paper 2014 with Solution

About this paper

This is the Jharkhand Academic Council (JAC) Class 12 Physics paper from the 2014 board examination, with an answer written under each question. The instructions, printed in English and Hindi, divide the paper into four groups: Group A is one question with fifteen one-mark multiple-choice parts, Group B has eight two-mark questions, Group C eight three-mark questions and Group D three five-mark questions, for 70 marks across 20 questions. The last question, on electromagnetic induction and Lenz's law, has a transformer question as its alternative. This copy is incomplete: the page holding Q16 to Q18 and the start of Q19 is missing.

Exam

JAC Class 12

Subject

Physics

Year

2014

Maximum marks

70

Questions

20

Pages

4

Answers included

Yes

Paper pattern

• Group A

  15 marks

  Question 1 with 15 multiple-choice parts, one mark each

• Group B

  16 marks

  Questions 2–9, two marks each

• Group C

  24 marks

  Questions 10–17, three marks each

• Group D

  15 marks

  Questions 18–20, five marks each

Topics covered

• Electrostatics and Gauss's theorem
• Capacitors
• Current electricity and Kirchhoff's rules
• Moving charges and magnetic field lines
• Electromagnetic induction and transformers
• Alternating current and reactance
• Electromagnetic waves and propagation
• Ray optics, lenses and prisms
• Photoelectric effect
• Atoms and nuclei
• Semiconductors and logic gates

Questions from this paper

1. What is quantization of charge? Find the number of electrons present in a charge of −6.4 nC.
2. Give expressions for the reactance of an inductor and a capacitor. How do they vary with the applied frequency?
3. State and prove Gauss's theorem.
4. The equivalent focal length of two thin lenses in contact is 20 cm. If the power of one lens is −3 D, find the focal length of the other lens.
5. Establish Einstein's formula for the photoelectric effect. A photon of energy 2 eV is incident on a metal surface of work function 0.8 eV. Find the stopping potential.
6. What is a transformer? Describe its principle, construction and working.