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Alpha particles are

A. electromagnetic radiations

B. helium nuclei

C. negatively charged particles

D. neutral particles

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  1. Acoustics is a property or
  2. Which of the following is wrongly matched?
  3. A device used to measure heights above sea level is known as
  4. Photoelectric cell is a device which converts
  5. When the disturbed electrons of an exited atom transfer back into lower energy levels they emit energy…
  6. The Solar System lies near the edge of a galaxy known as
  7. The ozone layer absorbs
  8. Water kept in an earthen pot is less cool on rainy days than in summer because during the rainy days
  9. Light from the sun reaches the earth in
  10. The hydraulic jack to lift heavy vehicles in automobile service stations is one of the applications…
  11. The mirage is a phenomenon
  12. Diamond shines because of its
  13. A bullet is fired at a certain angle with the horizontal. Its path will be
  14. The best estimates of the age of the earth comes from the studies of
  15. In the case of bodies falling under gravity which of the following remains constant at a given place?
  16. In a dynamo
  17. The method used to separate aluminium from a alumina is
  18. A pair of stars that revolve round each other is
  19. The audible range of a normal human ear is frequencies ranging from
  20. In a refrigerator, the refrigerant is
  21. Raindrops assume a spherical shape because or
  22. If you want to open a door with les difficulty you push it
  23. The function of a moderator in a nuclear reactor is
  24. Body A is kept in contact with body B. Heat will flow from A to B if
  25. A lightning conductor installed in a building
  26. The rings of Saturn were discovered by
  27. The period of a geostationary (synchronous) satellite orbiting the earth over the equator la
  28. The light from the star nearest to the sun reaches the earth in
  29. Nuclear fusion is a process in which
  30. Enriched uranium means