: CBSE Sample Question Papers

DELHI

Q. 1. What is the work done in moving a charge of 10 NC between two points on equipotential surface ?
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Q. 2. Name the device used for measuring the internal resistance of a secondary cell. 1
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Q. 3. What is the nature of the magnetic field in moving coil galvanometer ? 1
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Q. 4. If a rate of change of current of 2 A s^-1 induces an e.m.f. of 10 mV in a solenoid, what is the self-inductance of the solenoid ? 1
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Q. 5. What type of magnetic material is used in making permanent magnets ? 1
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Q. 6. Two metals A, B have work-function 2eV, 4eV respectively. Which metal has a lower threshold wavelength for photoelectric effect ?
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Q. 7. Which has more ionising power : alpha or beta particles ? 1
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Q. 8. Which part of the electromagnetic spectrum is used in operating RADAR ? 1
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Q. 9. Which type of biasing gives a semiconductor diode very high resistance ?
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Q. 10. How is luminosity of the star is related to its radius ?
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(Out Side Delhi)

Q. 1. In parallel plate capacitor, the capacitance increases from 4µF to 80µF on introducing a dielectric between the plates. What is the dielectric constant of the medium ?
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Q. 2. Give reasons as to why electrical conductance of electrolytes is less than that of metals.
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Q. 3. How does the intensity of magnetisation of paramagnetic material vary with increasing magnetic field ?
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Q. 4. The instantaneous current from A.C. source is / = 5 sin 314t. What is the r.m.s. value of the current ? 1
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Q. 5. Why is the transmission of signals using ground waves restricted to frequencies less than about 1,500 kHz? 1
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Q. 6. Draw a p-n junction with reverse bias. 1
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Q. 7. If maximum kinetic energy of electrons emitted by a photo cell is 4eV, what is the stopping potential ?
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Q. 8. What causes the tail of a comet when the comet passes close to the sun ?
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Q. 9. Write any one equation representing nuclear fusion reaction.
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Q. 10. What is the nature of the magnetic Held in a moving coil galvanometer ? 1
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Q. 11. The electric field due to a point charge is 20 NC^-1 and electric potential at that point is 10 JC^-1 . Calculate the distance of the point from the charge and magnitude of the charge.
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Q. 12. In the following circuit, a metre bridge is shown in its balanced state. The metre bridge has a resistance of 1 ohm cm^-1. Calculate the value of unknown resistance X and the current drawn from the battery of negligible resistance. 2
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Q. 13. Calculate the electrical conductivity of the material of conductor of length 3m, area of cross-section 0.02 mm² having a resistance of 2 ohm.
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Q. 14. Define self-inductance. Write down the expression for the sell-inductance of a long solenoid of length /. 2
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Q. 15. A T.V. tower has a height h. Derive an expression for the maximum distance upto which the signals can be received on the earth. 2
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Q. 16. How can one distinguish between unpolarized and a linearly polarized light beam using polaroid ?
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