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For viewing objects placed at a higher level from a position at a lower level, the instrument used' Is known aa

A. telescope

B. spectrometer

C. microscope

D. periscope

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  1. A solar eclipse occurs when the earth, the sun and the moon are in a straight line, and
  2. The completely dark portion of a shadow of an object is known as
  3. A simple mercury barometer is found in a slightly slanting position. The atmospheric pressure
  4. Which part of the eye photographic camera?
  5. Thick brick walls are used in the construction or a cold storage because bricks
  6. The force of attraction or repulsion between two charged bodies is directly proportional to the product…
  7. Before the invention of geostationary satellites, television stations could not transmit their programmes…
  8. It is more difficult to walk on ice than on a concrete road because
  9. A proton is
  10. A cup of hot coffee is placed on a metal table in a room. By which of the following methods does it…
  11. The fact that two large ships travelling on close parallel courses in the same direction tend to move…
  12. Antiparticle of electron is
  13. The attraction between similar molecules is called
  14. When an incident beam of light strikes the surface of a glass slab normally, the refracted beam
  15. In the ramous equation of Einstein E = mc2 , 'c' denotes.
  16. Less dew is formed on cloudy nights because
  17. A lactometer la used to
  18. In a refrigerator cooling is produced by
  19. A radio set that uses valves does not start operating immediately when it is switched on whereas a set…
  20. The force that keeps a body in a circular motion la called
  21. The enormous energy released in nuclear and thermonuclear reactions is due to conversion of
  22. The image of an object formed on the retina of the eye is
  23. The period of a geostationary (synchronous) satellite orbiting the earth over the equator la
  24. Cyclotron is an apparatus used
  25. The ozone layer absorbs
  26. The nuclear model of atom was first visualised by
  27. A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks…
  28. Credit for starting Space Science Research in India goes to
  29. When a whistling engine approaches a person standing on the platform, the frequency or the note
  30. A bolometer is used to measure