# CBSE Class 12th Physics Practice Paper: Pre-Board: Set-I

Oct 6, 2015 17:48 IST

Find CBSE Class 12 Physics Pre-Board Practice Paper for the coming exam 2015-2016. These questions are based on the analysis of previous years’ question papers. This paper will not only help the students to prepare for exams in a better manner, but will also help them in understanding the depth with which a topic should be studied.

Few Sample Questions from this paper are as follows:

Q. Using Bohr's postulates of the atomic model derive the expression for radius of nth electron orbit. Hence obtain the expression for Bohr's radius.

Q. What is a communication system? Describe briefly the major constituents of a communication system.

Q. Draw a plot showing the variation of photoelectric current with collector plate potential for two different frequencies v1 > v 2 of incident radiation having the same intensity. In which case will the stopping potential be higher? Justify your answer.

Q. Using Huygens’ Principle draw a diagram showing how a plane wave gets refracted when it is incident on the surface separating a rarer medium from a denser medium. Hence verify Snell’s law of refraction.

Q. A capacitor has some dielectric between its plates, and the capacitor is connected to a DC source. The battery is now disconnected and then the dielectric is removed. State whether the capacitance, the energy stored in it, electric field, the charge stored and the voltage will decrease, increase or remain same.

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