CBSE Class 12 Physics Sample Paper 2020 Solved (4)

CBSE Class 12 Physics Sample Paper 2020 Solved (4). It’s always recommended to practice as many sample papers as possible before the examinations. Students can download the sample papers and also question papers of previous years to practice and score better marks in examinations. Refer to other links too for more sample papers. 

1.A conducting wire is kept along the E→W direction and is allowed to fall freely. Will an e.m.f be induced in the wire?

2.What physical quantity is same for X-rays of wavelength 10^-10 m, red light of wavelength 6800 Å and radio wave of wavelength 500 m?

3.How does focal length of a lens change when red light incident on it is replaced by violet light? Give reason for your answer.

4.Which of the following waves can be polarized (i) Heat waves (ii) Sound waves? Give reason to support your answer.

5.Write the relationship between the size of a nucleus and its mass number (A).

6. A parallel beam of light of wavelength 600 nm is incident normally on a slit of width ‘a’. If the distance between the slits and the screen is 0.8 m and the distance of 2nd order maximum from the centre of the screen is 15 mm, calculate the width of the slit.

Or

Two polaroids ‘A’ and ‘B’ are kept in crossed position. How should a third polaroid ‘C’ be placed between them so that the intensity of polarised light transmitted by polaroid B reduces to 1/8th of the intensity of unpolarised light incident on A?

7. A magnet is quickly moved in the direction indicated by an arrow between two coils C1 and C2 as shown in the figure. What will be the direction of induced current in each coil as seen from the magnet? Justify your answer..

Please click the link below to download CBSE Class 12 Physics Sample Paper 2020 Solved (4).