Why does diamond shine at night?

Q. Process of breeding fish in ponds and artificial reservoirs is known as
  1 Aquaculture
  2 Fishing
  3 Apiculture
  4 Pisciculture
  Ans:4
Q. Why does diamond shine at night?
  1 Diamonds are radioactive so there are radiations
  2 On account of high refractive index, the rays of light get internally reflected
  3 Diamonds shine because they have some amount of radium in the
  4 Diamond shines because it has tetrahedral molecular structure
  Ans:4
Q. The International Court of Justice has
  1 10 judges
  2 15 judges
  3 20 judges
  4 25 judges
  Ans:2
Q. The Paralympic Games 2008 were held in
  1 Tokyo
  2 Madrid
  3 Stockholm
  4 Beijing
  Ans:4
Q. Non-conventional source of energy best suited for India is
  1 Solar energy
  2 Wind energy
  3 Tidal wave energy
  4 Nuclear energy
  Ans:1
Q. What is meat by myopia?
  1 Long-sightedness
  2 Short-sightedness
  3 Colour blindness
  4 Night blindness
  Ans:2
Q. Communal electorate in India was introduced through which of the following acts?
  1 1909
  2 1919
  3 1935
  4 None of these
  Ans:1
Q. Rowlatt Act was passed in the year
  1 1917
  2 1919
  3 1921
  4 1923
  Ans:2
Q. 4th July, 1776 is important in world history because
  1 Battle of Plassey started
  2 Sea route to India was discovered
  3 English King Charles II was executed
  4 American congress adopted the Declaration of Independence
  Ans:4
Q. Which of the following pairs is correct?
  1 Ashvaghosa - Vikramaditya
  2 Banabhatta - Harshvardhan
  3 Harisena - Kanishka
  4 Kalidasa - Samudragupta
  Ans:2