[Works Manager, 2018]
16. The substance most commonly used as a food preservative is:
Sodium bicarbonate
Tartaric acid
Acetic acid
Benzoic acid
17. A chemical reaction that takes place with the evolution of heat is called a/an:
Reversible reaction
Endothermic reaction
Thermal reaction
Exothermic reaction
18. Protein responsible for blood clotting is
Albumin A
Globulin
Fibroin
Fibrinogen
19. Goitre is caused by the deficiency of :
Calcium
Iron
Phosphorus
Iodine
20. Size of nanoparticles is in the range of:
10–9 m
10–9 cm
10–19 cm
1019 cm