For the students getting geared up for the CBSE Class 12th Board Examination, 2017, its important to get familiarize with the core topics and master them. Solving the previous year papers can be of great help to crack the exams with optimum score. Previous year papers also get you an idea of the pattern and marking scheme that CBSE uses while setting the paper.
Keeping in mind the immense importance of the previous year papers, Jagranjosh.com presents the CBSE Class 12 Physics Solved Question Paper 2014. The paper contains well descriptive answers to all the questions that will give the students an idea of how to attempt all the questions writing appropriate answer to each within the time constraint.
A few Questions from this Set are given below:
Q. Using the concept of force between two infinitely long parallel current carrying conductors, define one ampere of current?
Sol. The ampere is defined as the constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 metre apart in vacuum, would produce between these conductors a force equal to 2 x 10-7 Newton per metre of length.
Q. Two equal balls having equal positive charge ‘q’ coulombs are suspended by two insulating strings of equal length. What would be the effect on the force when a plastic sheet is inserted between the two?
Sol. The electric field lines due to any of the charges will not be able to pass the plastic sheet as we know that plastic is an insulator. If there is no external electric field due to another charge, then it’s for sure that the two charges would not experience any force due to each other.
Q. Why is it found experimentally difficult to detect neutrinos in nuclear β-decay?
Sol. Neutrinos are uncharged particles with almost no mass also, they interact very weakly with matter and are hard to detect. This is why; it is experimentally difficult to detect neutrinos in nuclear β-decay.
Q. Write the functions of the following in communication system:
A transducer is used to convert a non-electrical signal like a voice signal into electrical form before sending it as an input to a transmitter.
A repeater is a combination of a receiver and a transmitter. It picks up the signal from a transmitter, amplifies it and re-transmits it. A repeater is mainly used to extend the range of
a communication system.
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