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 is commonly called a polyamide ?
  2. Liquefied Petroleum gas (LPG) consists of mainly
  3. The recent atomic weight scale is based on
  4. Cell membrane is
  5. The property of a substance to absorb moisture from the air on exposure is called
  6. Polythene is industrially prepared by the polymerisation of
  7. The marine animal called dugong which is vulnerable to extinction is a/an
  8. The removal of top soil by water or wind is called
  9. Apparatus invented by Archimedes is :
  10. The metal used in storage batteries
  11. The fastest acting enzyme in the biological kingdom is
  12. The solar eclipse occurs when
  13. The oxide of Nitrogen used in medicine as anaesthetic is
  14. When a gas is turned into a liquid, the process is called
  15. Rust is
  16. Brass gets discoloured in air due to the presence of which gas in air
  17. The hardest substance available on earth is
  18. Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
  19. Bromine is
  20. The metal that is present in Photo Films is
  21. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
  22. Permanent hardness of water can be removed by adding
  23. In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If…
  24. The colour of Emerald is
  25. The chemial name of Uria is
  26. Lightening cause rainfall because
  27. Which of the following is in liquid form at room temperature ?
  28. Epoxy resins is used as
  29. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  30. Which of the following elements is a metal