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Class 12th CBSE 2015 Physics Paper Set 1

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Class-12th CBSE
Subject-Physics Set 1
year-2015      

Here is some questions:-
SECTION-A

1. Define capacitor reactance. Write its S.I. units.
SECTION-B
1. A proton and an α-particle have the same de-Broglie wavelength. Determine the ratio of (i) their accelerating potentials (ii) their speeds.
SECTION – C
1. Name the parts of the electromagnetic spectrum which is
 (a) suitable for radar systems used in aircraft navigation.
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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