CBSE Class 12 Physics Question Paper Solution in PDF ||

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In Today's blog we bring you CLASS 12 SCIENCE PAPER 2019
Previous Year Question Paper Of Class 12 of Session 2019
Solved Question Paper of Science 2019

                 CBSE Question Paper 2019
                         Class 12 Physics
                            Time - 3Hr
                             Marks: 80
General Instructions:
1. All questions are compulsory. There are 27 questions in all.
2. This question paper has four sections: Section A, Section B, Section C and Section D.
3. Section A contains five questions of one mark each. Section B contains seven questions of two
marks each, Section C contains twelve questions of three marks each, and Section D contains
three questions of five marks each.
4. There is no overall choice. However, internal choices have been provided in two questions of
one mark, two questions of two marks, four questions of three marks and three questions of five
marks weightage. You have to attempt only one of the choices in such questions.
5. You may use the following values of physical constants wherever necessary.

                              Section A

1. Draw the pattern of electric field lines, when a point charge –Q is kept near an uncharged conducting plate.
Solution: 

2. How does the mobility of electrons in a conductor change, if the potential difference 

applied across the conductor is doubled, keeping the length and temperature of the 

conductor constant? 

SOLUTION: The mobility of electrons in a conductor is given by the expression, 

As its independent of the applied potential difference, so it will not change if the applied 

potential difference will be doubled.

3 Define the term "Threshold frequency", in the context of photoelectric emission. 

OR 

Define the term "Intensity" in the photon picture of electromagnetic radiation.

SOLUTION: 

For a given Photosensitive material, there is a certain minimum cut off frequency at which 

Photoelectric emission is possible is called Threshold frequency, i.e. At this frequency just 

emission of photoelectrons happens without giving them any kind of additional energy. Higher 

the work function of the material, greater is the Threshold frequency. 

See the figure below of two different metals having different Threshold Frequency.

OR 

The intensity I, is defined as the total amount of energy falling on a given surface/Region per 

unit time 'rand per unit area A: 

4. What is the speed of light in a denser medium of polarizing angle 30?

Solution:

5. In sky wave mode of propagation, why is the frequency range of transmitting signals 

restricted to less than 30 MHz? 

OR 

On what factors does the range of coverage in ground wave propagation depend? 

SOLUTION: In sky wave mode of propagation, the frequency range of transmitting signals 

restricted to less than 30 MHz, because it is the maximum frequency below which the signals 

can be transmitted from one point to another point via reflection from ionosphere. Above this 

frequency, the signals will be transmitted through the ionosphere and are not reflected back.

OR

The ground wave propagation is preferred usually for long distance communication using 

frequencies below 3 MHz. The range of coverage of ground wave propagation depends on 

transmitted power and frequency.

6. Two bulbs are rated...

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