Whith of the foltlowings ot sfos A) gasoline () natural g (C) coal (D) biomass (
ID: 697462 • Letter: W
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Whith of the foltlowings ot sfos A) gasoline () natural g (C) coal (D) biomass (E) Marcellus shale gas 8. What percentage of the electriity produced in the world today comes from nudear tele (a20% Ifvery pure silicon is doped with a small amount of ansenic, the resultingcrystal iscalled (A)0% (0)10% (0)40% (A) n-type semiconductor (0) p type semiconductor (C) solar cell (D) battery 10 if very pure siliconis doped with a small amount of boron,the resultingcorystal is called (A) n-type semiconductor (8) p-type semiconductor (C) solarcell (D) battery 11. What is diamond composed of? (A) Carbon atoms (8) Carbon atoms and silver atoms (C) Hydrogen molecules and silver atoms (D) Hydrogen molecules (E) Sugar molecules 12. Which of the following mixtures is most acidic? (A) Mine drainage sample with its pHs 4 (B) Lemon juice with its pH . 2 (C) Rain water with its pH-55 (D) Blood with its pH 7.2 13. Gasoline is a(n) (A) compound. (B) element. (C) complex mixture of oil, fats, and proteins. (D) complex mixture of Cs-C12 hydrocarbons.Explanation / Answer
7. (D) Biomass is not a fossil fuel. (Biomass is energy obtained by burning firewood and other organic matter)
8. (A) 0 % (Nuclear energy comes from nuclear fission presently not fusion)
9. (A) n-type semiconductor (Because here electrons conduct electricity)
10. (B) p-type semiconductor (here hole conduct electricity)
11. (A) Carbon atoms (diamond is an allotrope of carbon)
12. (B) Lemo juice with pH = 2 (the lesser the pH the greater the acidity)
13. (D) Complex mixture of C5 - C12 hydrocarbons
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