CBSE Guess > Papers > Question Papers > Class XII > 2004 > Physics > Compartment Outside Delhi Set-I PHYSICS (Set I— Compartment Outside Delhi) Q. 1. Define the term ‘wavefront’. 1 Q. 2. Name the experiment for which the following graph, showing the variation of intensity of scattered electrons with the angle of scattering, was obtained. Also name the important hypothesis that was confirmed by this experiment. 1
Q. 3. Write the full form of the terms (i) SSI and (ii) VLSI used for different types of integrated circuits. 1 Q. 4. Name the two types of orbits (other than the geostationary orbit) used in satellite communication. 1 Q. 5. Find the capacitance of the capacitor that would have a reactance of 100 ohm when used with an a. source of frequency
Q. 6. Name the dielectric whose rnolecules have (i) non-zero, (ii) zero dipole moment. Define the term ‘dielectric constant’ for a medium. 2 Q. 7. Define the term ‘self-inductance’ Give its unit. Write an expression for the energy stored in an inductor when a steady current ‘I’ is passed through it. Is this energy elect or magnetic” 2 Q. 8. What is meant by coherent sources of light? Can two identical and independent sodium lamps act as coherent sources? Give reason for your answer. 2
Q. 9. Name the two factors on which the resistivity of a given material depends. A carbon resistor has a value of
Q. 10. A charged particle, having a charge q, is moving with a Speed v along the x-axis. It entres a region of space where an electric field
Or A straight wire, of length L, carrying a current I, stays suspended horizontally in mid air in a region where there is a uniform magnetic field Q. 11. Draw a diffraction pattern due to a single slit illuminated by a monochromatic source of light. Light, of wavelength 500 nm, falls, from a distant source on slit 0.50 mm wide. Find the distance between the two dark bands, on either side of the central bright band, of the diffraction pattern observed, on a screen placed 2 m from the slite. 2 Q. 12. An a.c. input signal, of frequency 60 Hz, is rectified by a (i) half wave full wave rectifier. Draw the output waveform and write the output frequency in each case. 2 Q. 13. Explain briefly the elements required to specify the earth’s magnetic field, at a given place. How does the value of angle of dip vary from the earth’s equator to the north pole? 3 Q. 14. Draw a labelled diagram of a co-axial cable. Mention Q. 15. Find (i) the equivalent capacitance and (ii) the total energy stored in the system of capacitors given in the network. The charging battery has an emf of 4 V. 3
Q. 16. Draw a circuit diagram for a meter bridge to determine the unknown resistance of a resistor. Obtain the balance condition for a meter bridge. Why are the connections between resistors of a meter bridge made of thick copper strips? Q. 17. State Faraday’s laws of electrolysis. Define Faraday constant. How would you test the accuracy of a given ammeter by using Faraday’s first law? 3 Q. 18. A straight wire, of length
Q. 19. Which of the following, if any, can act as a source of electromagnetic waves? Q. 20. Obtain Einstein’s photoelectric equation. Explain how it enables us to understand the Q. 21. Draw the general shape of the plot of the binding energy per nucleon versus the mass number for different nuclei. Hence explain why we must expect a release of nuclear energy during (i) nuclear fission, (ii) nuclear fusion. Or Group the following six nuclides into three pairs of 8sotones and (iii) isobars: Q. 22. The decay constant, for a given radionuclide, has a value of 1.386 day-1. After how much time will a given sample of this radionucilde get reduced to only 6.25% of its present number? 3 Q.23. With the help of the diagrams, explain briefly the meaning of the following terms: Q. 24. In the figure shown, calculate the total flux of the electrostatic field through the spheres S1 and S2. The wire, AB, shown here, has a linear charge density ,
Q. 25. Figures (a), (b) and (c) show three a.c. circuits in which equal currents are flowing. If the frequency of emf be increased, how will the current be affected in these circuits? Give reason for your answer.
An a.c. circuit consists of a series combination of circuit elements ‘X’ and ‘Y’. `The current is ahead of the voltage in phase by
Q. 26. Draw a ray diagram to show the formation of the image of a point object Or Draw a ray diagram to show the formation of the image of a distant object by an astronomical telescope in the normal adjustment position. Obtain an expression for the magnifying power of the telescope in this adjustment Q. 27. Draw the circuit diagram of an n-p-n transistor in common emitter configurati-on to study its (i) input and (ii) output characteristics. Draw approximate shapes of these characteristics.
CBSE 2004 Question Papers Class XII
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with a tolerance of 5%. Give the colour code for this resistor. 2
and a magnetic field
are both present. The particle, on emerging from this region, is observed to be moving along the x-axis only. Obtain an expression for the magnitude of
in terms of v and E. Give the direction of
. 2
. The linearmass density of the wire is 
. Obtain the magnitude and direction of this magnetic field. 2
meter, is bent into a circular shape. If the wire were to carry a current of 5A, calculate the magnetic field, due to it, before bending, at a point distant 0.01 times the radius of the circle formed from it. Also calculate the magnetic field, at the centre of the circular loop formed, for the same value of current. 3
, given by
where x is the distance measured along the wire, from the end A. 3
. If element ‘X’ is a pure resistor of
, (i) name the circuit element ‘Y’, and (ii) calculate the rms value of current, if rms value of voltage is 141 V. 5
where ‘u’ and ‘v’ have their usual meanings.