What percentage of earth’s water supply is fresh water___________?
A. 3%
B. 5%
C. 21%
D. None of these
A. 3%
B. 5%
C. 21%
D. None of these
		A. 5,000 to 10,000
B. 10,000 to 15,000
C. 15,000 to 20,000
D. 20,000 to 25,000
The average adult at rest inhales and exhales something like 7 or 8 liters (about one-fourth of a cubic foot) of air per minute. That totals something like 11,000 liters of air (388 cubic feet) in a day.
The air that is inhaled is about 20-percent oxygen, and the air that is exhaled is about 15-percent oxygen, so about 5-percent of the volume of air is consumed in each breath and converted to carbon dioxide. Therefore, a human being uses about 550 liters of pure oxygen (19 cubic feet) per day.
Water is a highly effective coolant for a car engine because _________?
		A. Water is good conductor of heat
B. Water has very high specific heat capacity
C. Water boils at a comparatively high temperature
D. Evaporation of water produces lot of cooling
When our sun reaches the end of its red giant phase, it will turn into a___________?
		A. Supernova
B. White Dwarf
C. Black Hole
D. Neutron Star
A. Sun
B. Moon
C. Galaxy
D. Meteorites
		A. Glaucoma
B. Hemophilia
C. Cataract
D. Diphtheria
		A. 2
B. 3
C. 4
D. 5