 # CBSE Class 12 Physics Sample Paper 2019

The board has released CBSE Sample Papers 2019. With this article, you can download CBSE 12th Physics Sample Paper 2019 (in PDF format)

Oct 28, 2018 18:30 IST CBSE Class 12 Physics Sample Paper 2019

The board has released CBSE Sample Papers 2019. With this article, you can download CBSE 12th Physics Sample Paper 2019 (PDF format) along with Solutions and Marking Scheme. CBSE Board Exam 2019 might start from 1st March 2019 and Physics Paper might be conducted in mid of March. To score good marks in CBSE Board Exams, candidates should start solving the latest CBSE Sample Papers and Previous Years Questions Papers.

To take maximum benefit of this sample paper, students must solve this sample paper and refer their solutions with the marking scheme to assess their preparation level of CBSE Class 12 Physics Board Exam 2019. All the problems of this Sample Paper are important for the coming CBSE Board Exam 2019.

Content from CBSE Class 12 Physics Sample Paper 2019

• Time allowed: 3 hours

• Maximum Marks: 70

General Instructions:

1. All questions are compulsory. There are 27 questions in all.

2. This question paper has four sections: Section A, Section B, Section C and Section D.

3. Section A contains five questions of one mark each, Section B contains seven questions of two marks each, Section C contains twelve questions of three marks each, and Section D contains three questions of five marks each.

4. There is no overall choice. However, internal choices have been provided in two questions of one mark, two questions of two marks, four questions of three marks and three questions of five marks weightage. You have to attempt only one of the choices in such questions.

5. You may use the following values of physical constants wherever necessary.

 c = 3 × 108 m/s h = 6.34 × 10‒34 Js e = 1.6 × 10‒19 C μo = 4π × 10‒7 T m A‒1 εo = 8.854 × 10‒12 C2 N‒1 m‒2 {1/(4π εo)} = 9 × 109 N m2 C‒2 Mass of electron = 9.1 ×10−31 kg Mass of neutron = 1.675 ×10−27 kg Mass of proton = 1.673 ×10−27 kg Avogadro's number = 6.023 ×1023 per gram mole Boltzmann constant = 1.38 ×10−23 JK−1

Section-A

Question1. State the SI unit of the electric polarization vector P.

Soution1. C/m2.

Question2. Define temperature coefficient of resistivity.

Solution2. Fractional change in resistivity per unit change in temperature.

Question3. Name the electromagnetic waves that are widely used as a diagnostic tool in medicine.

Solution3. X-rays.

OR

Question3. Name the current which can flow even in the absence of electric charge.

Solution3. Displacement current.

Question4. A ray of light is incident on a medium with angle of incidence ‘i’ and is refracted into a second medium with angle of refraction ‘r’. The graph of sin i versus sin r is as shown. Find the ratio of the velocity of light in the first medium to the velocity of light in the second medium. Solution4.

From the graph tan ϴ = (sin r)/(sin i)

⇒ (sin i)/(sin r) = v1/v2

v1/v2 = cot ϴ.

Question5. Two particles have equal momenta. What is the ratio of their de-Broglie wavelengths?

Solution5.

As, P1/P2

So, ration λ1 : λ2  = 1:1.

OR

Question5. Monochromatic light of frequency 6.0 × 1014 Hz is produced by a laser. What is the energy of a photon in the light beam?

Solution5:

Each photon has an energy, E = h.ν = (6.63 × 10 ‒ 34 J s) (6.0 × 1014 Hz) = 3.98 × 10–19 J.

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Rest questions are available in PDF of CBSE Class 12 Physics Sample Paper 2019.