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CBSE Guess > Papers > Question Papers > Class XII > 2004 > Physics > Compartment Delhi Set-II

PHYSICS (Set II— Compartment Delhi)

Except for the following questions, all the remaining questions have been asked in Set I.

Q. 2. Two beams, one of red light and the other of blue light, of the same intensity are incident on a metallic surface to emit photoelectrons. Which one of the two beams emits electrons of greater kinetic energy? 1

Q. 3. The distance, of the field point, on the axis of a small electric dipole, is doubled. By what factor will the electric field, due to the dipole, change? 1

Q. 4. Name the electromagnetic waves that have frequencies greater than these of ultraviolet light but less than those of gamma rays. 1

Q. 7. Identify the part of the electromagnetic spectrum which is
(i) suitable for radar systems used in aircraft navigation.
(ii) adjacent to the low frequency end of the electro-magnetic spectrum.
(iii) produced in nuclear reactions.
(iv) produced by bombarding a metal target by high speed electrons.

Q. 8. A converging and \diverging lens of equal focal lengths are placed coaxially in contact. Find the power and focal length of the combination. 2

Q. 11. When the cold junction, of an iron-lead thermocouple, is maintained at 0°C, the thermo emf, E, of this thermocouple, has the temperature dependence given by the relation

where E is in volts and is the temperature of the hot junction, in 0C. Find the temperature of inversion of this thermocouple.2

Q. 19. When two known resistances, R and S, are connected in the left and right gaps of a meter bridge, the balance point is found at a distance from the ‘zero end’ of the meter bridge wire. An unknown resistance X is now connected in parallel to the resistance S and the balance point is now found at a distance from the zero end of the meter bridge wire. Obtain a formula for X in terms of , and S.3

Q. 24. What is meant by the term ‘optical communication’? Give any two advantages of this mode of communication over the conventional two wire or cable electronic communication systems. 3

Physics 2004 Question Papers Class XII
Delhi Outside Delhi Compartment Delhi Compartment Outside Delhi
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