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Old January 4th, 2014, 05:27 PM
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Join Date: Jun 2013
Default Re: CBSE Physics 12th Class Paper

Here I am giving you question paper for the 12th class Physics of CBSE board of education in PDF file attached with it so you can get it easily..

Some questions are given below :

1. Two identical charged particles moving with same speed enter a region of uniform magnetic field. If one of these
enters normal to the field direction and the other enters along a direction at 300 with the field, what would be the
ratio of their angular frequencies?

2. Why does a metallic piece become very hot when it is surrounded by a coil carrying high frequency alternating
current?

3. How is a sample of an n-type semiconductor electrically neutral though it has an excess of negative charge carriers?

4. Name the characteristics of electromagnetic waves that
(i) increases
(ii) remains constant
in the electromagnetic spectrum as one moves from radiowave region towards ultravoilet region.

5. How would the angular separation of interference fringes in young’s double slit experiment change when the
distance of separation between the slits and the screen is doubled?

6. Calculate the ratio of energies of photons produced due to transition of electron of hydrogen atom from its,
(i) Second permitted energy level to the first level, and
(ii) Highest permitted energy level to the second permitted level

7. Give expression for the average value of the a c voltage
V = V0 Sin t ω
(4)
over the time interval t = 0 and t =

8. How is the band gap, Eg, of a photo diode related to the maximum wavelength, m , that can be detected by it?

9. Keeping the voltage of the the charging source constant, what would be the percentage change in the energy stored
in a parallel plate capacitor if the separation between its plates were to be decreased by 10%?

10. Explain how the average velocity of free electrons in a metal at constant temperature, in an electric field, remain
constant even though the electrons are being constantly accelarated by this electric field?

11. How is the resolving power of a microscope affected when,
(i) the wavelength of illuminating radiations is decreased?
(ii) the diameter of the objective lens is decreased?
Justify your answer.

12. What is the basic difference between the atom or molecule of a diamagnetic and a paramagnetic material? Why are
elements with even atomic number more likely to be diamagnetic?
13. Why are infrared radiations referred to as heat waves also? Name the radiations which are next to these radiations
in electromagnetic specturm having
(i) Shorter wavelength.
(ii) Longer wavelength.
Attached Files Available for Download
File Type: pdf CBSE Physics 12th Class Paper.pdf (70.7 KB, 89 views)
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  #3  
Old October 17th, 2015, 05:35 PM
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Default Re: CBSE Physics 12th Class Paper

I am preparing for the 12th CBSE board exam and for the preparation I want the past year question paper of Physics of 12th CBSE so can you provide me?
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  #4  
Old October 17th, 2015, 05:39 PM
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Join Date: Dec 2012
Default Re: CBSE Physics 12th Class Paper

Ok, as you want the past year question paper of Physics of 12th CBSE so here I am providing you.

12th CBSE Physics question paper

Maximum Marks: 70

Time Allowed: 3 Hours

All questions are compulsory.

There are 26 questions in all.

This question paper has five sections: Section A, Section B, Section C, Section D and Section E.





Here I am attaching a pdf file of question paper
Attached Files Available for Download
File Type: pdf 12th CBSE Physics question paper.pdf (149.6 KB, 29 views)
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Last edited by Aakashd; August 10th, 2018 at 10:37 AM.
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