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

CBSE 2004 Question Papers Class XII
	English		Sociology
	Functional English		Psychology
	Mathematics		Philosopy
	Physics		Computer Science
	Chemistry		Entrepreneurship
	Biology		Informatics Practices
	Geography		Multimedia & Web Technology
	Economics		Biotechnology
	Business Studies		Physical Education
	Accountancy		Fine Arts
	Political Science		History
	Agriculture