Heat transfer

A. cools the body that transfers it

B. heats the body that absorbs the heat

C. may change the physical state of the substance

D. All the above

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  1. The number of electrons in the outer orbits of a nucleus gives
  2. The orbit of Venus lies between those of
  3. If you want to open a door with les difficulty you push it
  4. In a refrigerator cooling is produced by
  5. For accurate scientific work, temperatures are often measured by
  6. When light passes from air to glass, its velocity in glass
  7. It is more difficult to walk on ice than on a concrete road because
  8. A photon is
  9. Out of the following, name the fluorescent substance.
  10. Photo-electric cells convert
  11. The filament used in the electric lamp is made of
  12. Besides protons, the nucleus of an atom contains
  13. Acoustics is a property or
  14. Which of the following pairs is not correct?
  15. If a body is taken from the earth to the moon
  16. The method used to separate aluminium from a alumina is
  17. Increase in pressure
  18. A body has fallen from a height. Just before touching the pound it has
  19. When a steel ball is placed on the surface of mercury, it does not sink because
  20. The speed of light is minimum while passing through
  21. The stars that shine brightly then dimly and then brightly are known as
  22. Fish and other aquatic creatures can live inside a deep frozen pond because
  23. The device for tracking and locating the position of a moving object in space is called
  24. Antiparticle of electron is
  25. The speed of sound in a medium depends upon the properties of the medium such as
  26. A rod of brass la held in hand and rubbed with fur. The rod is found to have
  27. When a whistling engine approaches a person standing on the platform, the frequency or the note
  28. The filament lamp is an example for
  29. The atmosphere gets heated up mainly by
  30. Rays similar to X-rays but of smaller wave length that are given off by radioactive substances are