Practice test 2. Corrections
The land on a 100-acre farm is equally suited for grazing cattle and growing corn, OF the ways of distributing land use, which would produce the greatest number of calories for human consumption?
0 for cattle, 100 for corn
A sample of radioactive waste has a half-life of 10 years and an activity level of 2 curies. After how many years will the activity level of this sample be 0.25 curie?
30 years
Which of the following best shows the process of evolution
A population of mosquitoes develops resistance to a pesticide.
Which of the following procedures would be best for remediating the effects of soil salinization?
Addition of large amounts of water to leach out salts.
The amount of sediment deposited at the mouth of a river system is likely to be increased by the pretense upstream of which of the following?
Artificial levees
Which of the following substances is released by CFC's and catalyzes a chain reaction that breaks down ozone in the upper atmosphere?
Chlorine
Which constitutes the greatest percent of domestic use of water in the United States?
Flushing toilets
_______ is measured by the amount of Ca2+ and Mg2+
Hardness
In the removal of a pollutant from wastewater, which of the following is true of the cost per unit of pollutant removed?
It increases as the concentration of the pollutant decreases
Which element constitutes the highest percentage of mass in Earth's crust?
Oxygen
Living organisms must acquire energy from their environment . Examples of adaptations that help organisms acquire this energy include which of the following?
The dark, heat-absorbing coloration of a reptile and the fangs and claws of a lion.
El Nino, a periodic warming of ocean surface waters, occurs in which of the following regions?
Tropical East PAcific
All of the following substances are derived from petroleum except...
cellulose
Zero population growth is associated with....
phases 1 and 4. (pre-industrial and post-industrial)
Which of the following is an inorganic compound?
table salt
