In an atomic nucleus, neutrons and protons are held together by

A. Magnetic forces

B. Gravitational forces

C. Coulombic forces

D. Exchange forces

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  1. Which of the following characters is not shown by hydrogen
  2. The most important ore of Aluminium is
  3. The removal of top soil by water or wind is called
  4. What is the unit for measuring the pitch or frequency of sound ?
  5. The recent atomic weight scale is based on
  6. Old-written material, which cannot be read easily can be read by
  7. In an atomic nucleus, neutrons and protons are held together by
  8. The chemial name of Uria is
  9. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  10. Nitrification means
  11. The oxide of Nitrogen used in medicine as anaesthetic is
  12. Permanent hardness of water can be removed by adding
  13. Earth's seasons are caused by which of the following?
  14. Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
  15. Glass is made from the mixture of
  16. Pollination by birds is called
  17. The speed of light with the rise in the temperature of the medium
  18. Which of the following is in liquid form at room temperature ?
  19. According to Daltons atomic theory the smallest particle which can exist independently is
  20. Apparatus invented by Archimedes is :
  21. The metallic constituents of hard water are
  22. The intencity of Earthquakes is measured on
  23. Epoxy resins is used as
  24. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
  25. Which of the following elements is obtained from sea weeds ?
  26. Water has maximum density at
  27. The property of a substance to absorb moisture from the air on exposure is called
  28. In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If…
  29. Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
  30. Liquefied Petroleum gas (LPG) consists of mainly