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Monday, 23 April 2018

Physical Science - Questions & Answers - 2


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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