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Chemistry
1.
Galvanising of sheet iron is done by dipping the sheet metal into molten
- A.Mercury
- C.Lead
- B.Cadmium
- D.Zinc
- Answer
- Report
Answer : [D]
2.
Which one of the following is an element?
- A.Ruby
- C.Emerald
- B.Sapphire
- D.Diamond
- Answer
- Report
Answer : [D]
3.
Three important micronutrients essential for human beings are
- A.Copper, Zinc and Iodine
- C.Nitrogen, Molybdenum and Iodine
- B.Zinc, Copper and Pottassium
- D.Sulpher,Copper and iron
- Answer
- Report
Answer : [A]
4.
Gypsum is added to cement clinker to
- A.Increase the tensile strength of the cement
- B.Bind the participles of calcium silicate
- C.Decrease the rate of setting of cement
- D.Facilitate the formation of colloidal gel
- Answer
- Report
Answer : [C]
5.
Which one of the following chemicals is responsible for the depletion of Ozone layer in the atmosphere?
- A.Chlorofluorocarbons
- C.Sulphur dioxide
- B.Nitrous oxide
- D.Carbon dioxide
- Answer
- Report
Answer : [A]
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