Previous year CBSE question papers give an idea of the type of questions and important topics covered in the board exam. Before going to appear in board exams, it is essential for the students to understand the latest examination pattern and marking scheme.
In order to help the students, Jagranjosh.com presents CBSE Class XII Board Exam Physics Solved Question Papers for the years 2011, 2012, 2013, 2014, 2015 and 2016. These Solved Question Papers will be helpful to get the latest pattern that how questions are being framed.
The pattern in which the question papers are being set for a particular subject is quite different from the manner in which the course structure is defined actually. Though the course curriculum is predefined, there are certainly some gaps between the question paper formed and the content of the course. Henceforth, students need to identify these gaps and catch up where the textbooks left off, if they want to get acquainted with the examination pattern. And, they can do it easily by checking out previous year question papers and their solutions. This not only helps them prepare for exams in a better manner but also leads them to the depth which the topic should be studied with.
Find the year-wise solved question papers for class 12th Physics
You can also get the following things for class 12th and class 10th both
- NCERT Solutions
Some solved questions from CBSE Class 12th Physics Question Paper 2011-Set I, are given here
Q. Where on the surface of the earth is the angle of dip 90°.
Ans. Angle of dip is 90° above Earth’s Magnetic North and South Pole.
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Q. A hollow metal sphere is charged such that the potential on its surface is 10 V. What is the potential at the centre of the sphere?
Ans. Since the electric field is equal to the rate of change of potential, this implies that the voltage inside a conductor at equilibrium is constrained to be constant at the value it reaches at the surface of the conductor. Therefore, the potential at the surface of the conductor is also 10 V.
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Q. How are radio waves produced?
Ans. Radio Waves are produced by-
a) Accelerated motion of charges in conducting wires.
b) Using tuning circuits like RC, LC & RLC.
c) Oscillating electrons in Plasma Oscillations.
d) Rapid acceleration and deceleration of electrons in aerials.
e) Using crystals.
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Q. Write any two characteristic properties of nuclear force?
Ans. Characteristic properties of nuclear force:
a) Short Ranged
b) Charge Independent
c) Does not obey Inverse Square Law
d) Spin Dependent
e) Non Central (Write any two).
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Q. What happens to the width of the depletion layer of a p-n junction when it is (i) forward biased or (ii) reverse biased?
Ans. The width of the depletion layer of a p-n junction:
a) Forward biased : Increases
b) Reverse biased : Decreases
Q. Define the term ‘stopping potential’ in relation to photoelectric effect?
Ans. The negative potential at which the photo electric current becomes zero is called the stopping potential or cut-off potential. Stopping potential is that value of retarding potential difference which is just sufficient to halt the most energetic photo electrons emitted. It is denoted by ‘Vο’.
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