: CBSE Sample Question Papers

(Numerical/Derivation Type Questions-5 Marks)

1. Height of a T.V tower situated in Delhi is 235 m. Calculate its coverage range. Radius of the earth = 6400 km.
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2. Deduce an expression for the distance up to which the T.V. signals can directly be received from a T.V. tower of height h.
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3. Give brief history of e.m. waves.
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4. Describe em spectra.
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5. What is displacement current ? What is its cause ?
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6. What is green house effect ?
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Short Answer Type Question

Q. 1. What is accomodation of the eye ? How is this achieved in human eye ?
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Q. 2. What is linear magnification ? Write its expression for a spherical mirror ?
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Q- 3. What are the various types of emission spectra ?
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Q. 4. What is the cause of the blue colour of the sky ?
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Q. 5. The refractive index of diamond is much greater than that of ordinary glass. Is this fact of some use to a diamond cutter?
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Q. 6. On placing a transparent glass cube on the printed page of a book, it was found that the covered printed words of the book are not visible from any of the four sides of the cube. Explain what happens with the help of a simple diagram (critical angle of glass w.r.t. air is 42°).
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Q. 7. Draw path of rays for astronomical telescope in normal adjustment.
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Q. 8. Draw a labelled diagram of a telescope which gives erect images of distant objects. Why are images in toys usually coloured ?
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Q. 9. A main is running with a velocity of 2m s^-1 away from the mirror. What is his velocity with respect to (a) mirror ; (b) his image ?
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Q. 10. An empty test tube is placed slating in the water and viewed from above, what will you observe ?
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Q. 11. What is law of refraction in terms of angles i and r ?
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Q. 12. Define refractive index in terms of velocity of light.
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Q. 13. What is the relation between critical angle and refractive index ? What is critical angle
for diamond ?
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Q. 14. How does the surface of the earth appears to a fish or a person sitting inside clear water ?
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Q. 15. What is an optical fibre or light pipe ?
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Q. 16. What is mirage phenomenon is hot countries ?
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Q. 17. What are totally reflecting prisms ? What are deviations produced in various cases ?
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Q. 18. Give two examples of refraction of light.
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Q. 19. (a) Why the day appears about tour minutes longer than what it is actually ? (b) Stars appear higher than their actual position. Why ?
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Short Answer Type Question

Q. 1. Some scientists have predicted that a global nuclear war on the earth would be followed by a severe ‘nuclear winter’ with a devastating effect on life on earth. What might be the basis of this prediction?
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Q. 2. Write four Maxwell Equations.
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Q. 3. State the characteristics of e.m. waves,
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Q. 4. A closed loop of B is produced by a changing electric Held. Does it necessarily mean that E and dE/dt are non-zero at all points on the loop and in the area enclosed by the loop?
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Q. 5. If you find closed loops of B in a region in space, does it necessarily mean that actual charges are flowing across the area bounded by the loops?
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Q. 6. Why is it that induced electric fields due to changing magnetic flux are more readily observable than the induced magnetic field due to changing electric fields?
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