Name of the Organisation : Kendriya Vidyalaya Sangathan, Ernakulam
Class : Class XII
Year : 2012-13
Subject : Physics
Document Type : Sample Question Paper
Website : https://roernakulam.kvs.gov.in/
Download Question Paper :
Sample Paper1 : https://www.pdfquestion.in/uploads/22180-Physics1.pdf
Sample Paper2 : https://www.pdfquestion.in/uploads/22180-Physics2.pdf
Physics Sample Question Paper :
General Instructions :
(a) All questions are compulsory.
Related : Kendriya Vidyalaya Sangathan Class X Social Science Sample Question Paper : www.pdfquestion.in/22163.html
(b) There are 29 questions in total. Question 1 to 8 carry one mark each, questions 9 to 16 carry two marks each, questions 17to 25 carry three marks each, question 26 is a value based question which carries 4 marks and questions 27 to 29 carry five marks each.
(c) There is no overall choice. However, an internal choice has been provided in one question of two marks, one question of three marks and all three questions of five marks each.
(d) Use of calculators is not permitted.
(e) You may use the following physical constants wherever necessary :
c = 3 x 108 m/s ,
h = 6.63 x 10-34 Js
e = 1.6 x 10-19C
μ0 = 4π x 10-7 Tm/A
1/ 4π€0 = 9 x109 Nm2 /C2
me=9.1 x 10-31 Kg
The electric field lines in a region are shown in the figure. A and B are two points in the region. At which point a charge ‘+q’ experiences minimum force?
2. A distorted signal is received by a receiver set. Suggest a method to rectify this while doing the modulation process?
3. A current I flows through a wire of radius ‘r’ and the drift velocity ‘vd’. What is the drift velocity of electrons through a wire of same material but having double the radius, when a current ‘2I’ flows through it?
4. The figure shows a long straight conducting wire of circular cross section of radius ‘a’ (shaded portion) carrying a current I. Assume the current is uniformly distributed across this cross section. Draw the shape of the graph between magnetic field versus distance ‘r’ in the region between ‘a’ and ‘r’ if r > a.
5. In India domestic power supply is 220V, 50Hz; while in USA it is 110V, 50Hz.Give one advantage and one disadvantage of 220V supply over110 V supply.
6. The graph of variation of resistance R of a metal wire as a function of its diameter D is as follows. Give the reason for the shape of the graph.
7. An audio signal is not transmitted directly by converting it into an electromagnetic wave of same frequency. Give two reasons.
8. A magician during a show makes a concave glass lens with refractive index 1.47 changes into convex lens while dipping it in another medium. What will be the ratio of refractive index of glass with that of the medium?
9. A solenoid has a core of a material with relative permeability 400. The windings of the solenoid are insulated from the core and carry a current of 2A. If the number of turns is 1000 per metre, Calculate the magnetic intensity ‘H’ and the magnetic field ‘B’.
10. The magnetic susceptibility for a specimen has a small negative value. To which class of the magnetic substances, does the specimen belong? What is Meissner effect?
11. Three resistors of resistance ‘r’ each are connected to get maximum possible resistance. Then they are connected differently to get minimum possible resistance. Find the ratio between minimum and maximum resistance so obtained.
12. A circular loop and a rectangular loop of wire are moving towards a uniform magnetic field region from a field free space with a constant velocity ’v’ with their plane perpendicular to the magnetic field.
In which loop the induced emf is constant during the time of motion? What about the emf induced in the other one?
13. A beam of light coming out of a convex lens when a point source is placed at its focus is incident on an equilateral prism. Draw the shape of wave fronts coming out of the convex lens and the prism.
14. A monochromatic source, emitting light of wave length, 600 nm, has a power output of 66W. Calculate the number of photons emitted by this source in 10 seconds.