CBSE Class 12 Physics Solved Paper 2020 – 55/2/1, 55/2/2, 55/2/3, 55/2/4, 55/2/5

Check here the correct answers, proposed by teachers, to the CBSE class 12 physics exam 2020 for paper codes 55/2/1, 55/2/2, 55/2/3, 55/2/4, 55/2/5.

Please note that we have provided the question paper and answers to one of the sets. However, all these seats – 55/2/1, 55/2/2, 55/2/3, 55/2/4, 55/2/5 – have the same questions, just in different orders. So you can go through this solved paper and know the answers to your paper.

Hope your exam went well!

CBSE Class 12 Physics Solved Paper 2020 – 55/2/1, 55/2/2, 55/2/3, 55/2/4, 55/2/5

Note: First read the question from the question paper, then look at the answers. That ways, you will be able to know the qs-ans for all the sets mentioned here.

Question Paper

For solutions to this paper, please scroll down to the end of the question paper.

Answers

Section A

1. A
2. A
3. A
4. C
5. C
6. B
7. A
8. A
9. C
10. A
11. q2-q1/ Ɛ0
12. Blue 
13. Multilevel
14. I₀ cos² θ
15. 2λ/a
16. Threshold frequency is defined as the minimum frequency of incident light which can cause photoelectric emission i.e. this frequency is just able to eject electrons without giving them additional energy.

Section B

21.microwave  

Uses: 

One of the most common uses of infrared radiation is in heat-sensitive thermal imaging cameras. These can be used to study human and animal body heat patterns, but more often, they are used as night-vision cameras.

Microwaves cause water and fat molecules to vibrate, which makes the substances hot. So we can use microwaves to cook many types of food. Microwaves are also used by fixed traffic speed cameras, and for radar, which is used by aircraft, ships and weather forcasters.

Gamma Rays: Sterilise food (irradiated food) Used as tracers in medicine. Radio Therapy- In oncology, to kill cancerous cells.

The most familiar use of x-rays is checking for fractures (broken bones), but x-rays are also used in other ways. For example, chest x-rays can spot pneumonia.

23. 

24. Mobility of the charge carrier is defined as the drift velocity of the charge carrier per unit electric field. It is denoted by m and is given as. The SI unit of m is m² V⁻¹ s⁻¹.

The mobility of a charge carrier is defined as the drift velocity of the charge carrier per unit electric field. If q be the charge of carrier and τ be the relaxation time, then mobility μ=mqτ where m be the mass of the charge carrier.

CBSE Class 12 Physics Solved Paper 2020