The base of an electric iron is brightly polished mainly

A. to make it smooth and frictionless

B. to make it rust - proof

C. to reduce heat loss by radiation

D. to make it more durable

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  1. Some persons are not able to see distant objects clearly because the image of the object is focused…
  2. Expansion of a rod when heated
  3. The shadow below a tree has bright spots in it because
  4. A pair of stars that revolve round each other is
  5. The image of an object formed in a plane mirror
  6. The colour of the light which travels through glass with minimum speed is
  7. In a hydraulic pressure
  8. The speed of sound in a medium depends upon the properties of the medium such as
  9. The loudness of a sound is determined by
  10. Which force is used when milk is churned to separate cream?
  11. Where does the centre of gravity of a rubber ring lie?
  12. A hydrogen bomb is based on
  13. In the visible spectrum which colour has the shortest wavelength?
  14. If a body weight 12N on the surface of the earth, how much will it weigh on the surface of the moon…
  15. The phenomenon of spontaneous disintegration of certain heavy nuclei is termed
  16. The radius of curvature of a spherical mirror is
  17. A radio set that uses valves does not start operating immediately when it is switched on whereas a set…
  18. The scientist who first sent electromagnetic waves to distant places was
  19. In experiments on static electricity the standard method for obtaining small amounts of positive electricity…
  20. The air inside an electric, bulb is removed to prevent
  21. Less dew is formed on cloudy nights because
  22. How is it that Pluto is not always the farthest planet of the solar system?
  23. Red Light is used as a dancer signal because
  24. The weight of a body is
  25. Cosmic rays contain
  26. Sound waves In 'air travel faster if
  27. If a band is played on the moon the sound will
  28. Commonly used safety fuse wire is made of
  29. If a man wants to hear clearly the echo of a sound produced by him from a hill, the hill should be away…
  30. A nuclear reactor is said to have become 'critical' when