21. Study of the evolution of man as an animal:
a) Chronology
b) Anthropology
c) Archaeology
d) Ethnology
22. Big history refers to:
a) Ancient Civilizations to Modern Times
b) Big Bang to Present
c) World Wars to Current Events
d) Prehistoric Era to the Industrial Revolution
23. Iron is an essential mineral which is needed for our body for the production of _________.
a) Hemoglobin
b) Bone
c) Teeth
d) Thyroxine
24. What is the most important layer of the earth:
a) Mantle
b) Crust
c) Core
d) None of these
25. The process of movement of molecules from a higher concentration place to a lower concentration places is known as:
a) Diffusion
b) Evaporation
c) Sublimation
d) Condensation
26. It is not advisable to sleep under a tree at night because of the release of:
a) More oxygen
b) less oxygen
c) carbon dioxide
d) carbon monoxide
27. When water freezes, it expands in volume by about:
a) 3%
b) 6%
c) 9%
d) 10%
28. Which of the following is most elastic material?
a) Rubber
b) Sponge
c) Glass
d) Steel
29. The most important stimulant in tea leaves is:
a) Caffeine
b) Brucine
c) Phenylalanine
d) Theine
30. Which gas can be accumulated in poorly ventilated buildings:
a) Xenon
b) Hydrogen
c) Radon
d) Helium
