A. Increase the Soil pH
B. Increase the bacteria activity
C. Both A & B
D. Decrease the bacterial activity
✅ The correct answer is option C.
SSC
662. Bring out the incorrect usage
A. Heavy water – Moderator
B. DDT – Insecticide
C. Methyl Alcohol – Beverage
D. Liquid Ammonia – Refrigerant
✅ The correct answer is option C.
663. Which among the following is ―Fool‘s Gold‖ ?
A. Copper Sulphate
B. Iron Sulfide
C. Brass
D. Silver Bromide
✅ The correct answer is option B.
664. Which among the following is an organic mineral?
A. Amber
B. Hornblende
C. Angite
D. Analcime
✅ The correct answer is option A.
665. Normal‖ rainfall is slightly acidic (and a pH of 5.6 has been assigned which might be somewhere near 5 ) because of the presence of _______?
A. Nitric Oxide
B. Sulphuric Acid
C. Nitric Acid
D. Carbonic Acid
✅ The correct answer is option D.
666. The chemical oxygen demand COD test is commonly used to measure which of the following?
A. amount of organic compounds in water
B. amount of oxygen in water
C. amount of oxygen in a chemical
D. amount of oxygen used in a oxygenation process
✅ The correct answer is option A.
667. As we all know that, Gunpowder is a mixture of sulfur, charcoal, and potassium nitrate. Which among these components adds in speeding up the burning of the Gun Powder?
A. Only Potassium Nitrate
B. Only Charcoal
C. Only Sulphur
D. Both Sulphur and Potassium Nitrate
✅ The correct answer is option C.
668. Which among the following is not correctly matched?
A. Brass: copper and zinc
B. Duralumin : Copper and aluminum
C. Constantan: Copper and Nickel
D. White Gold- Gold and Silver
✅ The correct answer is option D.
669. Pearl is mainly made up of which among the following?
A. Protein
B. Calcium Carbonate
C. Silica
D. Sodium Carbonate
✅ The correct answer is option B.
670. Which among the following does not come under carbon Group of Periodic Table?
A. silicon
B. germanium
C. tin
D. selenium
✅ The correct answer is option D.