26. Teflon, the tough and fire resistant polymer,
containing the halogen:
Flourine
27. The glass used to make optical instruments:
Flint glass
28. Molish test is used to detect the presence of:
Carbohydrates
29. The acid used to make permanent writing on
the surface of glass:
Hydrofluric acid
30. What is the full form of LPG?
Liquified Petroleum
Gas
31. Cyclonite is also known as:
RDX
32. A non metal other than carbon which shows allotropy is:
Sulphur
33. The radioactive isotope used to determine the
activity of thyroid gland is:
Iodine-131
34. Camphor can be separated from sand by:
Sublimation
35. Which halogen is contained in DDT?
Chlorine
36. Smoke, fog and mist are examples of:
Aerosols
37. Iron that contains the highest percentage of
carbon:
Pig Iron
38. Acidity in milk is caused by:
The activity of enzymes
39. Which element has the lowest melting point?
Helium
40. The element with the highest density
Osmium
41. The lightest metal:
Lithium
42. The element with the highest boiling point:
Tungsten
43. Which element has the second highest density?
Iridium
44. The most abundant metal in human body:
Calcium
45. What percent of the atmosphere is Oxygen?
20.95
46. What percent of the mass of human body is
Oxygen?
65
47. The most common element on the earth’s crust
by mass:
Oxygen
48. The most abundant element in the moon:
Oxygen
49. Which metal has the highest melting point?
Tungsten
50. The most abundant metal in the whole earth:
Iron
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