ISC Class 12 Physics Sample Paper (2). ISC issues sample papers every year for students for class 12 board exams. Students should solve the ISC issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many ISC sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.
PART-1
Q1. Answer all question briefly and to the point:
(i) Explain the statement ‘Relative permittivity of water is 81’.
(ii) Draw (at least three) electric lines of force due to an electric dipole.
(iii) Find the value of resistance X in the circuit below so that the junction M and N are at the same potential.
(iv) When the cold junction of a certain thermo-couple was maintained at 20 degree C, its neutral temperature was found to be 180 degree C. Find its temperature of inversion.
(v) State how the magnetic susceptibility of a ferromagnetic change when it is heated.
(vi) Write an equation of Lorentz force F acting on a charged particle having charge q moving in a magnetic field B with a velocity v in vector form.
(vii) What is the value of power factor in a series LCR circuit at resonance?
(viii) An a.c. generator generates an emf ‘e’ given by : e = 311 Sin (100 pai t) volt. Find the rms value of the emf generated by the generator.
(ix) A ray LM of monochromatic light incident normally on one refracting surface AB of a regular glass prism ABC emerges in air from the adjacent.
(x) Describe the absorption spectrum of Sodium.
(xi) A thin converging lens of focal length 15 cm is kept in contact with a thin diverging lens of focal length 20 cm. Find the focal length of this combination.
(xii) Can two sodium vapour lamps act as coherent sources? Explain in brief.
(xiii) Why all over the world, giant telescopes are of reflecting type? State any one reason.
(xiv) A ray of ordinary light is incident on a rectangular block of glass at Brewster’s angle. What is the angle between the reflected ray and the refracted ray of light?
(xv) Find the momentum of a photon of energy 3.0 eV.
(xvi) The half life of a certain radio active element is 8 hours. if a pupli starts with 32 g of this element, how much of the sample will be left behind at the end of one day?
(xvii) If a hydrogen atom goes from III excited state to 11 excited state, what kind of radiation (visible light, ultra violet, infrared, etc.) is emitted?
(xviii) Where in our universe is the thermo-nuclear energy being released naturally?
(xix) In which of the solids (semi-conductors, conductors or insulators) do conduction band and valence band overlap?
(x) What is the symbol of a NOR gate?
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