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q Model Question Paper Class 12h Subject :- Physics ‘Time: - 3 Hours Max. Marks :- 70 Section -A ( Five Questions each of 1 mark) QNo1:- Ifa wire of Resistance “R” is stretched so that its length is doubled. Calculate the Change in resistance? Q No 2 :- How does the angle of minimum deviation ( Gm) of a glass prism vary, if incident violet light is replaced by red light? Q No 3 :- What is work function in photoelectric effect, QNo¢ :- Optical effects are produced by E-vector or B-Vector in electromagnetic waves. QNoS:- What are eddy currents definition only. Section -B ( Five Questions each of 2 marks) Q No 6:- What is Malus Law in polarisation OR What is Fringe width in interference? Write down its mathematical expression. QNo7 :- Write properties and uses of Radio-Waves. Q No 8: Calculate the radius (tr) of the loop when a charged particle is projected perpendicular to a Magnetic field Intensity(B) ? Q No 9:- Calculate the wavelength of radiation emitted when transition occurs from ist- excitation state to ground state, Q No 10: Write two properties of materials suitable for making a) A permanent Magnet. b) An electromagnet. Section -C (Five Questions each of 3 marks) Q No 11:- a) What is Kirchhoff's 2nd Law? Write down the sign convention for currents and e.m.f's 6) Derive Principle of wheat stone bridge using Kirchhoff’s law. A AnyScanner 
