CBSE Class 12 Physics Question Paper Solved 2019 Set K

CBSE Class 12 Physics Question Paper Solved 2019 Set K. 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. 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.

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

3. 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 ?

4. Why is the terminal voltage of a cell generally less than the emf of the cell ?

5. Plot a graph showing the variation of photoelectric current versus intensity of light.

SECTION B

6. A beam of light converges at a point P. Now a convex lens is placed in the path of the convergent beam at 15 cm from P. At what point does a beam converge if the convex lens has a focal length 10 cm ? An object is kept in front of a concave mirror of focal length 15 cm. The

image formed is real and three times the size of the object. Calculate the distance of the object from the mirror.

7. Explain giving reason, how the magnifying power of a compound microscope depends on the (i) wavelength of incident light, and (ii) focal length of the objective lens.  

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