Board Paper of Class 12-Science 2019 Physics Abroad(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
Plot a graph of stopping potential (V0) versus the frequency (v) of incident radiation in photoelectric emission. VIEW SOLUTION
- Question 2
Name the charge carries for the flow of current in a (i) conductor and (ii) electrolyte. VIEW SOLUTION
- Question 3
Why are the antennas in space wave mode of propagation generally mounted at heights of many wavelengths above the ground ? VIEW SOLUTION
- Question 4
Two identical conducting balls A and B have charges −Q and +3Q respectively. They are brought in contact with each other and then separated by a distance d apart. Find the nature of the Coulomb force between them.
ORVIEW SOLUTION
A metallic spherical shell has an inner radius R1 and outer radius R2. A charge Q is placed at the center of the shell. What will be the surface charge density on the (i) inner surface, and (ii) outer surface of the shell?
- Question 5
The small ozone layer on top of the stratosphere is crucial for human survival. Why ?
ORVIEW SOLUTION
Illustrate by giving suitable examples, how you can show that electromagnetic waves carry energy and momentum.
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