CBSE Class 12 Physics Sample Paper 2021 Solved (2)

CBSE Class 12 Physics Sample Paper 2021 Solved (2). CBSE issues sample papers every year for students for Class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.

SECTION-A

1 An ac source of voltage V =V0 sin ωt is connected to an ideal capacitor. Draw graphs and phasor diagram of voltage V and current I.

2 The variation of potential difference V with length l in case of two potentiometer wires P and Q is as shown. Which one of these will you prefer for comparing emfs of two primary cells and why?

3 Define mobility of a charge carrier. How is the mobility affected with increase in temperature?

4 What is Meissner effect?

5 Why alloys like constantan and manganin are used for making standard resistors.

SECTION-B

6 Derive an expression for the energy stored in a parallel plate capacitor C, charged to a potential difference V.

OR

Derive an expression for potential energy of a system of two like charges placed in a uniform external electric field.

7 (i) How are infrared waves produced? Write their one important use.

(ii) The thin Ozone layer on top of the stratosphere is crucial for human survival. Why?

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