Which of the following is primarily known as a selective absorber of ultraviolet radiation?
A. water vapour
B. carbon dioxide
C. clouds
D. ozone
Answer: D
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The influenza virus is typically spread by
A. body fluid contact or airborne emissions. B. sharing needles. C. resistance to cleaning chemicals. D. body fluid contact only. E. airborne emissions only.
Which continent has the greatest number of inhabitants?
A) North America B) South America C) Europe D) Africa E) Asia
Which of the following types of electromagnetic radiation are arranged in the proper decreasing order of energy?
A) Infrared, x rays, AM radio B) Microwaves, ultraviolet, green light C) Radio waves, gamma rays, ultraviolet D) Blue light, infrared, AM radio
In five half-lives, one-sixteenth of a radioactive substance will remain. Indicate whether the statement is true or false