Find CBSE class 12th Physics Practice paper for the Board examination. Question has been framed as per the syllabus covered in the Board examination. It is very important to prepare for the Board examination as it makes a good stock for obtaining excellent marks.
Some Question of this Practice paper are given here
Q. A choke and a bulb are in series to a dc source. The bulb shines brightly. How does its brightness change when an iron core is inserted inside the choke coil?
Q. The motion of copper plate is damped when it is allowed to oscillate between the two poles of a magnet. What is the cause of this damping?
Q. Explain briefly how electromagnetic waves are produced by an oscillating charge. How the frequency of the EM waves is produced related to that of the oscillating charge?
Q. Draw a labeled diagram of a full wave rectifier circuit. State its working principle. Show the input-output waveforms?
Q. Why is a Zener diode considered as a special purpose semiconductor diode? Draw the I-V characteristics of Zener diode and explain briefly how reverse current suddenly increases at the breakdown voltage. Describe briefly with the help of a circuit diagram how a Zener diode works to obtain a constant dc voltage from the unregulated dc output of a rectifier.