JAC Class 12 Physics Question Paper 2016 with Solution

About this paper

This is the Jharkhand Academic Council (JAC) Class 12 Physics paper from the 2016 board examination, with an answer under each question. Twenty questions are arranged as 15 objective parts, eight short questions, eight longer ones and three long answers. The short questions include electric field lines, emf and terminal potential difference, critical angle, microwaves, self and mutual induction, Rutherford's model and why a transistor base is thin. A numerical Young's-slit question gives slits 0.03 cm apart, a screen 1.5 m away and the fourth bright fringe 1 cm from the centre. The long answers have alternatives: Gauss's theorem for a charged shell, a series LCR circuit, and Huygens' principle for the law of refraction. Marks and time are not printed.

Exam

JAC Class 12

Subject

Physics

Year

2016

Questions

20

Pages

7

Answers included

Yes

Paper pattern

• Group A

  Question 1 with 15 objective parts

• Group B

  Questions 2–9

• Group C

  Questions 10–17, including a coil-field calculation, Young's fringes and a Zener diode

• Group D

  Questions 18–20, each with an alternative

Topics covered

• Electrostatics and Gauss's theorem
• Current electricity and potentiometer
• Moving charges and the magnetic dipole moment
• Electromagnetic induction
• Alternating current and LCR circuits
• Electromagnetic waves and microwaves
• Ray optics and total internal reflection
• Polarisation and Young's experiment
• Photoelectric effect
• Atoms, nuclei and mass defect
• Semiconductors, Zener diodes and modulation
• Communication systems

Questions from this paper

1. What are electric field lines? Mention two of their properties.
2. Define critical angle and state the conditions for total internal reflection.
3. A circular coil of 100 turns, each of radius 8.0 cm, carries a current of 0.40 A. What is the magnetic field at the centre of the coil?
4. In Young's experiment the slits are 0.03 cm apart and the screen is 1.5 m away. The fourth bright fringe is 1 cm from the central fringe. Find the wavelength of the light.
5. What is a Zener diode? Explain its action as a voltage regulator.
6. State Faraday's law of electromagnetic induction and derive the emf induced in a coil rotating uniformly in a uniform magnetic field.