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Class 12th CBSE 2015 Physics Paper Set 3
Class-12th CBSE
Subject-Physics Set 3
year-2015
Here is some questions:-
SECTION-A
1. A concave lens of refractive index 1.5 is immersed in a medium of refractive index 1.65. What is the nature of the lens ?
SECTION-B
1. Distinguish between ‘intrinsic’ and ‘extrinsic’ semiconductors.
SECTION – C
1. State the principle of working of a galvanometer.
A galvanometer of resistance G is converted into a voltmeter to measure upto V volts by connecting a resistance R1 in series with the coil..............
Section – D
1. A group of students while coming from the school noticed a box marked “Danger H.T. 2200 V” at a substation in the main street.......
Answer the following questions :
(i) What device is used to bring the high voltage down to low voltage of a.c. current and what is the principle of its working ?
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