Name of the Board : CBSE Academic
Class : XII STD
Document Type : Sample Question Paper
Subject : Physics
Year : 2016 – 2017
Website : http://cbseacademic.in/SQP_CLASSXII_2016_17.html
Download Sample Question Paper : https://www.pdfquestion.in/uploads/10147-PHYSICS17.pdf
Marking Scheme : https://www.pdfquestion.in/uploads/10147-PhysicsMS.pdf
Physics Sample Question Paper :
Time allowed : 3 hours
Maximum Marks : 70
Related : CBSE Academic XII STD Mathematics Sample Question Paper : www.pdfquestion.in/10117.html
General Instructions :
(i) All questions are compulsory.
(ii) There is no overall choice. However, an internal choice has been provided in one question of two marks, one question of three marks and one question of five marks. You have to attempt only one of the choices in such questions. This paper has five distinct sections.
(iii) Section A has Question numbers 1 to 5. They are very short answer type questions, carrying one mark each.
(iv) Section B has Question numbers 6 to 10. They are short answer type questions, carrying two marks each.
(v) Section C has Question numbers 11 to 22. They are also short answer type questions, carrying three marks each.
(vi) Section D has Question number 23. It is a value based question, carrying four marks.
(vii) Question numbers 24 to 26 are long answer type questions, carrying five marks each.
(viii) Use of calculators is not permitted. However, you may use log tables, if necessary.
Section A :
1. Represent graphically the variation of electric field with distance, for a uniformly charged plane sheet. (1)
2. Draw a graph to show a variation of resistance of a metal wire as a function of its diameter keeping its length and material constant. (1)
3. A rod of length L, along East-West direction is dropped from a height H. If B be the magnetic field due to earth at that place and angle of dip is ?, then what is the magnitude of induced emf across two ends of the rod when the rod reaches the earth?
4. Two polaroids are placed with their optic axis perpendicular to each other. One of them is rotated through 45°, what is the intensity of light emerging from the second polaroid if I0 is the intensity of unpolarised light? (1)
5. With the help of a block diagram, show the basic constituents of the communication system. (1)
Section B :
6. Two wires A and B of the same material and having same length, have their cross sectional areas in the ratio 1:6. What would be the ratio of heat produced in these wires when same voltage is applied across each? (2)
7. The focal length of a convex lens made of glass is 20 cm. What will be its new focal length when placed in a medium of refractive index 1.25?
8. An ?-particle and a proton are accelerated through the same potential difference. Calculate the ratio of linear momenta acquired by the two. (2)
9. The activity R of an unknown nuclide is measured at hourly intervals. The results found are tabulated as follows
a) Plot the graph of R versus t and calculate half life from the graph.
b) Plot the graph of ln (R/Ro) versus t and obtain the value of half life from the graph.
10. Distinguish between any two types of propagation of electromagnetic waves based on a) frequency range over which they are applicable and b) communication systems in which they are used. (2)
Section C :
11. If N drops of same size each having the same charge, coalesce to form a bigger drop. How will the following vary with respect to single small drop? (3)
(i) Total charge on bigger drop
(ii) Potential on the bigger drop
(iii) Capacitance
12. In the given circuit, a metre bridge is shown in the balanced state. The metre bridge wire has a resistance of 1 ? cm-1. Calculate the unknown resistance X and the current drawn from the battery of a negligible internal resistance if the magnitude of Y is 6 ?. If at the balancing point, we interchange the position of galvanometer and the cell, how it will affect the position of the galvanometer? (3)
OR
Calculate the current drawn from the battery in the given network shown here.
State Kirchhoff’s loop law and name the law on which it is based on. (3)