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Physics | KA Board | Grade 12 | 2015
Q. Write two properties of magnetic lines of force.
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Q. Derive an expression for electric field due electric dipole at a point on an equatorial line.
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Q. A resistor is marked with colours red, red, orange and gold. Write the value of its resistance.
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Q. By assuming Bohr's postulates derive an expression for radius of nth orbit of electron, revolving round the nucleus of hydrogen atom.
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Q. What is interference? Write the condition for path difference in case of constructive and destructive interference.
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Q. State Ampere's circuital law.
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Q. Mention two limitations of Ohm's law.
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Q. Draw the block diagram of generalised communication system.
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Q. Derive the expression for refractive index of the material of the prism in terms of angle of the prism and angle of minimum deviation.
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Q. Derive an expression for magnetic field strength at any point on the axis of a circular current carrying loop using Biot-Savart's law.
KA Board
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Q. Write three difference between diamagnetic and paramagnetic substances.
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Q. Show that voltage leads current by π2, when A.C. voltage applied to pure inductance.
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Q. Write Coulomb's law in vector form. Also explain the terms.
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Q. Derive the expression for capacitance of parallel plate capacitor.
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Q. Define S.I. unit of charge.
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Q. Mention two applications of infrared radiation.
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Q. Name spectral series of hydrogen which lies in the ultraviolet region of electromagnetic spectrum.
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Q. What is attenuation in communication system?
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Q. Define specific binding energy.
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Q. Distinguish between conductor and semiconductor on the basis of band theory of solids.
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Q. Write Einstein's equation of photoelectric effect. Give Einsteins explanation of photoelectric effect.
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Q. Mention the significance of Lenz's law.
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Q. What is the conclusion of Davison and Germer experiment on the nature of electron?
KA Board
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Q. What is photo diode? Mention its one use.
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Q. Current in a coil falls from 2.5 A to 0.0 A in 0.1 second inducing an emf of 200V. Calculate the value of self inductance.
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Q. What is magnetic declination?
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Q. Derive the expression for motional EMF induced in a conductor moving in a uniform magnetic field.
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Q. What is equivalent resistance? Derive the expression for effective resistance of two resistors connected in parallel.
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Q. Draw the ray diagram of image formation in case of compound microscope.
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Q. Explain with circuit diagram how to convert galvanometer into an ammeter.
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