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PHYSICS – IMPORTANT QUESTION BANK 
 Calculate the magnetic field at point inside on the axis of a solenoid having infinite length.
 State difference between Ammeter and voltmeter.
 Derive Newton’s formula for focal length of convex lens. Whether this formula is true for all kinds of lens? Write with reason.
 Why is spark produced in a switch when current is switched off? If the current of 5 ampere flowing through primary coil is decreased to zero in 1.0 second then induced e.m.f. in secondary coil is 10 volt, calculate mutual inductance.
 Write Faraday’s Laws of Electromagnetic Induction and obtain an expression of induced e.m.f.
 Write laws of photoelectric effect.
 What is meant by shunt? Write the principle of shunt.
 Explain Biosavart’s Law.
 Work function of copper is 4 eV. What is meant by this statement?
 Derive expression for the force acting between two parallel current carrying conductors. When will it be attractive and when will it be repulsive?
 What are electromagnetic waves? Write their characteristics
 With the help of BiotSevert’s law, obtain an expression for the intensity of magnetic field near a straight, long current carrying conductor.
 With the help of BiotSevert’s law, obtain an expression for the intensity of magnetic field near a straight, long current carrying conductor.
 Sometimes spark is produced in a switch, when current is switched off. Why?
 Refractive index of glass with respect to air is 1.5. Find the refractive index of air with respect to glass.
 The height of a T.V. tower is 100 meter. If the population density around it is 1000 per square kilometer, what population will be covered by T.V. transmission? (The radius of earth = 6.4 x 106 meter)
 What is communication system? What are the main parts of it, explain with block diagram.
 What is meant by Fax? Write the working method of Fax by drawing block diagram.
 State and Prove Gauss’s Theorem. deduce coulomb’s inverse square law with the help of Gauss theorem
 If the length of a conducting wire becomes twice, when stretched. Then, how many times, resistance will increase Calculate?
 With the help of Kirchhoff’s Law explain the wheat stone’s bridge principle.
 Prove that the electric potential at a point in broad side on position due to an electric dipole is zero.
 Establish the formula for capacitance of parallel plat capacitor’s in presence of partially dielectric.
 Describe a MODEM under the following points – a. Labelled block diagram. b. Working method.
 Describe the experiment of finding out internal resistance of any cell by potentiometer under following headings –Electric circuit, Deduction of formula, Observation table and two precautions.
 What arrangements are made for making moving coil galvanometer, Dead Beat? Calculate value of self inductance of the coil if 1.2 ampere current is flowing through the coil having 1000 turns and flux linked with it is 1.2 x 105 Wb.
 What is a greenhouse effect?
 What is light emitting diode (LED). Explain its working principle and state factors on which the colour of light emitted by it depends.
 What is optical fibre? What are main parts of it? Explain.
 The magnifying power of an objective lens of a compound microscope is 8 if the magnifying power of the compound microscope is 32. Then calculate magnifying power of an eyepiece lens.

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