CBSE Class 12 Physics Question Paper 2019 Set 10 Solved

CBSE Class 12 Physics Question Paper Solved 2019 Set J. Students can download the last year board exams question papers using the link below. Free download of examination question papers with solutions. Last 10 year question papers should be practised to get better marks in examinations.

SECTION A

1. Two identical conducting balls A and B have charges –Q and +3Q respectively. They are brought in contact with each other and then separated by a distance d apart. Find the nature of the Coulomb force between them.

OR

A metallic spherical shell has an inner radius R₁ and outer radius R₂. A charge Q is placed at the centre of the shell. What will be the surface charge density on the (i) inner surface, and (ii) outer surface of the shell ?

2. Under what condition will the current in a wire be the same when connected in series and in parallel of n identical cells each having internal resistance r and external resistance R ?

3. The small ozone layer on top of the stratosphere is crucial for human survival. Why ?

OR

Illustrate by giving suitable examples, how you can show that electromagnetic waves carry both energy and momentum.

4. The figure shows the variation of stopping potential V_o with the frequency v of the incident radiations for two photosensitive metals P and Q. Which metal has smaller threshold wavelength ? Justify your answer.

5. Why is ground wave transmission of signals restricted to a frequency of 1500 kHz ? 

Please click the link below to download pdf file of CBSE Class 12 Physics Question Paper Solved 2019 Set J.