CBSE Board Physics Question Paper, 1997
Q. 1. Give the ratio of velocity of light rays of wavelength 4,000 A and 8,000 A in vacuum. 1
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Q. 2. A student obtains resistances of 3, 4, 12, 16 Q using only two metallic resistance wires either separately or joined together. What is the value of each of these wires ? 1
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Q. 3. Define dielectric constant of a medium in terms of forces between electric charges. 1
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Q. 4. The wavelengths of some of the spectral line obtained in hydrogen spectrum are 9546 A 6,463 A and 1,216 A. Which of these wavelengths belong to Lyman’s series ?
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Q. 5. Write down the truth table for the combination of gates shown here.
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Q. 6. In a certain arrangement a proton does not get defected while passing through a magnetic field region. Under what condition is it possible ?
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Q. 7. Give the phase difference between applied voltage and the current in LCR circuit at resonance.
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Q. 8. Refractive index of glass for lights of yellow, green and red colours are µy, µg, µr respectively. Rearrange these symbols in increasing order of values.
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Q. 9. Define intensity of electric field at a point. At what point is the electric dipole field intensity is parallel to line joining them.
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Q. 10. Capacitor P, Q and R have each a capacity C. A battery can charge the capacitor P to a potential difference V. If after charging P, the battery is disconnected from it and the charged capacitor is connected in the following instants to Q and R :
(i) to Q in parallel and (ii) to R in series
Then what will be the potential differences between the plates of P in two instants.
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Q. 11. Define chemical equivalent and electrochemical equivalent of a substance. Establish a relation between them.
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Q. 12. State and illustrate Curie law in magnetism.
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Q. 13. How can magnetic moments of two magnets of same size and mass be compared using a vibration-magnetometer ?
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Q. 14. State Lenz’s law. Show that it is a consequence of the law of conservation of energy.
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Q. 15. Prove mathematically that the average power over a complete cycle of alternating current through an ideal inductor is zero.
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