11. Gypsum is added to clinker during cement manufacturing to:
A. Decrease the rate of setting of cement
B. Bind the particles of calcium silicate
C. Facilitate the formation of colloidal gel
D. Impart strength to cement
12. Which one among the following elements/ions is essential in small quantities for the development of healthy teeth but causes mottling of the teeth if consumed in higher quantities?
A. Fluoride
B. Chloride
C. Iron
D. Potassium
13. Contact lenses are made from:
A. Polyvinyl chloride
B. Teflon
C. Polystyrene
D. Lucite
14. Which one among the following metals is used for making boats because it does not corrode by seawater?
A. Nickel
B. Tungsten
C. Antimony
D. Titanium
15. Which one among the following is a strong-smelling agent added to an LPG cylinder to help in the detection of gas leakage?
A. Thioethanol
B. Ethanol
C. Methane
D. Chloroform
16. Which one among the following substances evolves heat when dissolved in water?
A. Potassium nitrate
B. Glucose
C. Sodium chloride
D. Calcium oxide
17. Dead organs are generally stored in formalin. Formalin is:
A. Aqueous formaldehyde
B. Aqueous ferrous sulphate
C. Aqueous formic acid
D. Aqueous ferric alum
18. Which of the following acid is present in Tamarind?
(A) Lactic acid
(B) Formic acid
C) Tartaric acid
(D) Citric acid
19. ‘s’ and ‘p’ block elements are called?
A) Representative elements
(B) Outer transition elements
(C) Inner transition elements
(D) Zero group elements
20. The concept of four elements on earth was introduced by?
A) Empedocles
(B) Al Kundi
(C) Bu Ali Sina
(D) Aristotle
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