General Knowledge Optional Question and Answer of General Science - Elements and Metals

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General Knowledge Optional Question and Answer of General Science - Elements and Metals 

 

1.   Brass gets discolored in the air because of the presence of which of the following gases in air?

  1. Oxygen
  2. Hydrogen sulfide
  3. Carbon dioxide
  4. Nitrogen

Answer: Option B

               

2. Which of the following is a non-metal that remains liquid at room temperature?

  1. Phosphorous
  2. Bromine
  3. Chlorine
  4. Helium

Answer: Option B

 

3. Chlorophyll is a naturally occurring chelate compound in which central metal is

  1. copper
  2. magnesium
  3. iron
  4. calcium

Answer: Option B

 

4. Which of the following is used in pencils?

  1. Graphite
  2. Silicon
  3. Charcoal
  4. Phosphorous

Answer: Option A

 

5. Which of the following metals forms an amalgam with other metals?

  1. Tin
  2. Mercury
  3. Lead
  4. Zinc

Answer: Option B

 

6. The chemical formula for water is

  1. NaAlO2
  2. H2O
  3. Al2O3
  4. CaSiO3

Answer: Option B

 

7. The gas usually filled in the electric bulb is

  1. nitrogen
  2. hydrogen
  3. carbon dioxide
  4. oxygen

Answer: Option A

 

8. Washing soda is the common name for

  1. Sodium carbonate
  2. Calcium bicarbonate
  3. Sodium bicarbonate
  4. Calcium carbonate

Answer: Option A

 

9. Quartz crystals normally used in quartz clocks etc. is chemically

  1. silicon dioxide
  2. germanium oxide
  3. a mixture of germanium oxide and silicon dioxide
  4. sodium silicate

Answer: Option A

 

10. Which of the gas is not known as a greenhouse gas?

  1. Methane
  2. Nitrous oxide
  3. Carbon dioxide
  4. Hydrogen

Answer: Option D

 

11. Bromine is a

  1. black solid
  2. red liquid
  3. colorless gas
  4. highly inflammable gas

Answer: Option B

 

12. The hardest substance available on earth is

  1. Gold
  2. Iron
  3. Diamond
  4. Platinum

Answer: Option C

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