CBSE Guess > Papers > Question Papers > Class XII > 2004 > Physics > Outside Delhi Set-III

PHYSICS (Set III—Outside Delhi)

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

Q. 2. Why is ground wave transmission of signals restricted to a frequency of 1500 kHz? 1

Q. 4. Draw the voltage-current characteristic of a p-n junction diode in forward bias. 1

Q. 6. Draw a ray diagram of an astronomical telescope in the normal adjustment position. What will be the length of the telescope for this position? 2

Q. 8. An electric dipole of length 4 cm, when placed with its axis making an angle of 30⁰ with a uniform electric field experiences a torque of 4 Nm. Calculate the (i) magnitude of the electric field. (ii) potential energy of the dipole, If the dipole has charges of 2

Q. 11. Two long parallel straight wires X and Y separated by a distance of 10cm in air carry currents of 10 A and 5 A respectively in the same direction. Calculate the magnitude and direction of the force on a 10 cm length of the wire Y. 2

A circular coil of 200 truns, radius 10 cm carries a current of 5 A. It is suspended vertically in a uniform horizonatal fiel of 0.4 T. the field lines making and angle 60⁰ with the plane of the coil. Calculate the magnitude of the troque that must be applied on it to prevent it form turing.

Q. 12. AT.V. tower has a height of 500 m at a given place. Calculate its coverage range, if the radius of the earth is 6400 km. 2

Q. 14. Calculate the binding energy per nucleon of nucleus.
[Given: mass of
mass of a neutron = 1.008665 u
mass of a proton =1.007825 u] 3

Q. 19. State Faraday’s laws of electrolysis. Deduce the relation connecting chemical equivalent, electrochemical equivalent and Faraday. 3

Q. 21. Potentiometer wire, PQ of 1 m length is connected to a standard cell E₁. Another cell, E₂ of e.m.f. 1.02 V is connected as shown in the circuit diagram with a resistance ‘r’ and a switch, S. With switch, S open, null position is obtained at a distance of 51 cm from P. Calculate (i) potential gradient of the potentiometer Wire and (ii) e.m.f of the cell E₁. (iii) When switch S is closed, will null point move towards P or towards Q? Give reason for your answer. 3

Physics 2004 Question Papers Class XII
Delhi		Outside Delhi		Compartment Delhi		Compartment Outside Delhi
	Set I		Set I		Set I		Set I
	Set II		Set II		Set II		Set II
	Set III		Set III