Board Paper of Class 12-Science 2019 Physics Delhi(Set 3) - 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
Distinguish between unpolarized and linearly polarized light. VIEW SOLUTION
- Question 2
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 3
How is the drift velocity in a conductor affected with the rise in temperature? VIEW SOLUTION
- Question 4
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 5
Draw the pattern of electric field lines when a point charge +q is kept near an uncharged conducting plate. VIEW SOLUTION
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