CBSE Guess > Papers > Question Papers > Class XII > 2003 > Physics > Compartment Delhi Set -I PHYSICS—2003 (Set I—Compartment Delhi) Q. 1. State two properties of nuclear forces. Q. 2. Name the physical quantity which has its unit JT -1 . Is it a scalar or a vector quantity? Q. 3. As shown in the figure, a charged particle enters a uniform magnetic field and experiences an upward force as indicated. What is the charge sign on the particle? Q. 4. Two plane sheets of charge densities Q. 5. Name an appropriate communication channel, needed to communicate a signal of hand width 100 kHz over a distance of 8 km. Q. 6. State Gauss' theorem in electrostatics. Using this theorem, prove that no electric field intensity exists inside a hollow charged conducting sphere. Q. 7. The voltage-current graphs for two resistors of the same material and same radii with lengths L1 and L2 are shown in the figure. If Q. 8. A ray of light passes through an equilateral prism (refractive index 1.5) such that angle of incidence is equal to angle of emergence and the latter is equal to 3/4th of angle of prism. Calculate the angle of deviation. Or Explain why does a convex lens behave as a converging lens when immersed in water Q. 9. Draw the graph to show the variation of thermo-electric e.m.f. with the temperature of the hot junction. How does (i) neutral temperature and (ii) temperature of inversion of a thermocouple change, if the temperature of the cold junction decreases? Q. 10. The potential difference across the collector of a transistor, used in common emitter mode is 1.5 V, with the collector resistance of Q. 11. Identify the logic gates marked P and Q in te given logic circuit. Write down the output at X for the inputs (i) A = 0, and (ii) A = 1, B = 1. Q. 12. Establish the relation between drift velocity Q. 13. Define the term 'potential gradient'. With the help of a circuit diagram, explain how a potentiometer can be used to compare the e.m.f.'s of two primary cells. Q. 14. A hydrogen ion of mass 'm' and charge 'q' travels with a speed Q. 15. State Lenz's law. Two identical loops, one of cooper and the other of aluminium are rotated with the same speed, in a uniform magnetic field acting normal to the plane of the loops. State with reason, for which of the coils (i) induced e.m.f., (ii) induced current, will be more Q. 16. Which of the following can be polarised : (i) X-rays, (ii) sound waves? Give reasons. Q. 17. Two independent sources of light cannot be coherent. Why? Q. 18. An electron and a proton have the same kinetic energy. Which of the two has greater wavelength? Justify your answer. Q. 19. A nucleus Q. 20. How are materials classified according to their behaviour in a non-uniform magnetic field? Give one example of each. Q. 21. What are inferior planets? Give its one example. Q. 22. Explain the formation of (i) 'potential harrier' and (ii) 'depletion region' in a p-n junction diode. Or What is the need of rectification? With the help of a circuit diagram, explain the working of a full wave rectifier. Draw its input and output waveforms. Q. 23. What is a dipole antenna? What role does it play in the communication system? How does, the length of dipole antenna vary with the frequency of the carrier waves? Q. 24. State two main advantages of optical communication method. Q. 25. Draw a ray diagram to show the formation of the real image of a point object due to a convex spherical refracting surface, when the ray of light is travelling from a rarer medium of refractive index Or Draw a ray diagram for the formation of image of a distant object by an astronomical telescope in normal adjustment position. Q. 26. Figure given below shows how the reactance of a capacitor varies with frequency Q. 27. Derive an expression for the energy stored in a parallel plate capacitor, with air as the medium between the plates. Physics 2003 Question Papers Class XII
CBSE 2003 Question Papers Class XII
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