Board Paper of Class 12-Science 2019 Physics Delhi(Set2) - Solutions
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 = 6.63 × 10–34 Js
e = 1.6 × 10–19 C
μo = 4π × 10–7 T m A–1ε0 = 8.854 × 10–12 C2 N–1 m–2
= 9 × 109 N m2 C–2
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- Question 1
Define the term "Threshold frequency", in the context of photoelectric emission.
ORDefine the term "Intensity" in the photon picture of electromagnetic radiation. VIEW SOLUTION
- Question 2
When unpolarized light is incident on the interface separating the rarer medium and the denser medium, Brewster angle is found to be 60°. Determine the refractive index of the denser medium. VIEW SOLUTION
- Question 3
In skywave mode of propagation, why is the frequency range of transmitting signals restricted to less than 30 MHz?
OROn what factors does the range of coverage in ground wave propagation depend? VIEW SOLUTION
- Question 4
When a potential difference is applied across the ends of a conductor, how is the drift velocity of the electrons related to the relaxation time? VIEW SOLUTION
- Question 5
Draw the equipotential surfaces due to an isolated point charge. VIEW SOLUTION
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