Radio waves sent out by radio stations are reflected by

A. troposphere

B. stratosphere

C. mesosphere

D. ionosphere

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  1. The Indian Satellite System used for domestic communications, television and meteorology is known as
  2. Meteors
  3. When ice melts, Its volume
  4. Besides protons, the nucleus of an atom contains
  5. In a freezer ice cubes will be formed more quickly in trays made of
  6. When a ship floats on water, the weight or water displaced is
  7. A hydraulic brake in an automobile uses
  8. Drinks kept in a vacuum flask remain hot or cold as the case may be for a long time because
  9. Compared to the atomic bomb, the destructive power of a hydrogen bomb is
  10. Solids have definite shapes. This is because
  11. During thunder storm you are travelling in a car. To protect yourself from the lightning you will have…
  12. The planet that moves fastest around the sun is
  13. The scientist who first sent electromagnetic waves to distant places was
  14. The velocity of sound in a medium is
  15. The ballistic missile, Agni 11, tested by India has a maximum range of
  16. If you want to open a door with les difficulty you push it
  17. It is easier to climb down a staircase than climb up because in climbing down
  18. The line on earth's surface passing through the places having zero dip is called the magnetic equator.…
  19. Primary colours are
  20. Skating on ice is possible because
  21. If you want a sound proof room, the walls should be
  22. Mica is used in an electric iron because it is a
  23. A temperature below absolute zero for an ideal gas
  24. The function of a ruse wire is
  25. A star contains
  26. Resistance is measured in
  27. The distance between two bodies is halved. Now the force of attraction between them will be
  28. A radio set that uses valves does not start operating immediately when it is switched on whereas a set…
  29. Nuclear fusion is a process in which
  30. The overhead wires supported by high towers in the grid system carry