Infrared waves are used in the night vision apparatus such as night vision goggles.
A. Babylonian
B. Greek
C. Egyptian
D. Aztec
Note : The Egyptians appear to have been the first to develop a solar calendar, using as a fix point the annual sunrise reappearance of the Dog star– Sirius, or Sothis in the eastern sky, which coincided with annual flooding of the River Nile. They constructed a calendar of 365 days, consisting of 12 months of 30 days each, with 5 days added at the year’s end. The Egyptians failure to account for the extra fraction of a day, however, caused their calendar to drift gradually into erro.
A. Meteorology
B. Weatherology
C. Ecology
D. Geology
A. Treaty among nations to reduce nuclear arsenals
B. Climate control treaty
C. Treaty to protect ozone layer
D. Trade policy about tarrifs
A. WBC
B. Platelets
C. RBC
D. All of the above
A. Iron
B. Tungsten
C. Copper
D. Silver
Of all metals in pure form, tungsten has the highest melting point (3422 °C, 6192 °F), lowest vapor pressure (at temperatures above 1650 °C, 3000 °F), and the highest tensile strength.
Fine organic or inorganic particles suspended in air is called _______________?
A. particulate pollutant
B. gaseous pollutant
C. aerosol
D. none of these