1. What is the main constituent of natural gas?
[A]Nitrogen
[B]Methane
[C]Oxygen
[D]Water
2. Which chemical element is represented by the symbol "N"?
[A]Nickel
[B]Niobium
[C]Neon
[D]Nitrogen
3. What is the boiling point of water?
[A]98 degrees
[B]100 degrees
[C]102 degrees
[D]104 degrees
4. What is the chemical name of vinegar?
[A]Acetic acid
[B]Hydrochloric acid
[C]Oxalic acid
[D]Sodium bicarbonate
5. When flying aeroplane at a high altitude, ______________________________________.
[A]Normal atmospheric pressure is maintained
[B]The atmospheric pressure increases
[C]The atmospheric pressure decreases
[D]Normal humidity is maintained
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