JAC Class 12 Physics Question Paper 2017 with Solution

About this paper

This is the Jharkhand Academic Council (JAC) Class 12 Physics paper from the 2017 board examination, with an answer under each question. Group A is 15 objective parts. Group B has eight short questions, from quantisation of charge and magnetic susceptibility to nuclear fission, a solar cell and why sky waves are not used for television. The instruction that can be read gives Group C eight questions of three marks each, including the energy in a capacitor, I = 20 sin(200πt), dispersion by a prism and a lens moved from air into water. Group D has three long questions, with a cyclotron, Kirchhoff's laws for a Wheatstone bridge, and single-slit diffraction as alternatives. A full-marks total and the time are not printed.

Exam

JAC Class 12

Subject

Physics

Year

2017

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, eight questions of three marks each

• Group D

  Questions 18–20, each with an alternative

Topics covered

• Electrostatics and capacitors
• Current electricity, drift velocity and Kirchhoff's laws
• Magnetism and Biot-Savart's law
• Electromagnetic induction and eddy currents
• Alternating current
• Electromagnetic waves
• Ray optics, lenses and dispersion
• Optical instruments and resolving power
• Photoelectric effect
• Radioactivity and nuclear fission
• Semiconductors, rectifiers and solar cells
• Communication systems

Questions from this paper

1. State and explain the principle of quantisation of charge.
2. Why are sky waves not used for transmitting television signals?
3. The equation of an alternating current is I = 20 sin(200πt). Calculate its frequency, peak value and rms value.
4. The focal length of a convex lens in air is 20 cm. Find its focal length when the lens is immersed in water.
5. What is Biot-Savart's law? Derive the magnetic field at a point on the axis of a current-carrying circular coil.
6. Draw a labelled diagram of image formation in a compound microscope and derive an expression for its magnifying power.