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# CBSE Class 12 Pre Board 2020 : Physics - Prelim 1 (Delhi Public School (DPS), Jammu)

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DELHI PUBLIC SCHOOL, JAMMU Assignment Pre-Board-I Class XII Subject: Physics 1. An electron, an alpha particle and a proton have the same kinetic energy. Which one ofthese particles has the largest d-Broglie wavelength? 2. Why should the material used for making permanent magnets have high coercively? 3. The radioactive isotope D decays according to the sequence - -particle If the mass number and atomic number of D2 are 176 and 71 respectively, what is (i)the mass number (ii) atomic number of D? 4 Draw a plot of potential energy of a pair of nucleons as a function of their separation. What is the significance of negative potential energy in the graph drawn? 5. A convex lens of refractive index 1.5 has a focal length of 18 cm in air. Calculate the change in its focal length when it is immersed in water of refractive index 4 6. Distinguish between the terms 'average value' and 'rms value' of an alternating current. The instantaneous current from an a.c. source is I = 5sin(314 t) ampere. What are the average and rms values of the current? 7.Write the relation for the force F acting on a charge carrier q moving with a velocity v through a magnetic field B in vector notation. Using this relation, deduce the conditions under which this force will be (i) maximum (ii) minimum. 8.A cylindrical metallic wire is stretched to increase its length by 5%. Calculate the percentage change in its resistance. 9. Define electric flux. Write its S.I. Units. A spherical rubber balloon carries a charge that is uniformity distributed over its surface. As the balloon is blown up and increases in size, how does the total electric flux coming out of the surface change? Give reason. 10.Deduce an expression for the electric potential due to an electric dipole at any point on its axis. Mention one contrasting feature of electric potential of a dipole at a point as compared to that due to single charge. le11.A parallel plate capacitor, each with plate area A and separation d , is charged to a potential difference V . The battery used to charge it is then disconnected. A dielectric slab of thickness d and dielectric constant K is now placed between the plates. What change, if any, will take place in

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