Find CBSE Class 12 Physics Practice Paper Set-IV. This paper contains important questions from 4th unit (Electromagnetic Induction and Alternating Current) of physics. These questions 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 the Question Paper are given below:
Q. One can measure direct current with the help of an ammeter but not alternating current. Explain?
Q. Amit brought a USA made electrical gadget on his recent visit to India. He showed this gadget to his wife. His wife appreciated his choice, but she pointed out that electronics item used in the USA may get damaged in India because USA household electric supply is 110 V, 50 Hz whereas in India it is 220 V, 50 Hz. Amit handled the gadget carefully before plugging it into the mains. The device was working fine.
(i) What values did you observe in Amit and his wife?
(ii) Which power supply is better 110 V, 50 Hz or 220 V, 50 Hz?
Q. An alternating voltage ν is applied across a series LCR circuit. Let νr be the resonant frequency for the circuit. Will the current in the circuit lead, lag or remain is phase with applied voltage when
(i) ν > νr
(ii) ν < νr? Explain your answer.
Q. What is wattles current or idle current? Explain why a capacitor blocks D.C. but allows A.C. to pass through it in a circuit.
Q. In which kind of generator the split rings are used? What is the main purpose of using split rings?
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