- What is meant by the term “enriched” uranium?
(A) Pure uranium, with no other elements present
(B) All nuclei are U-238 in the sample
(C) Uranium that has been rinsed in heavy water to enrich it
(D) Uranium that has a higher proportion of U-235 nuclei than normal
(E) Uranium that has had plutonium added to it- Which of the following is NOT a benefit associated with Integrated Pest
Management (IPM)?
(A) More reliable and effective pest control
(B) Reduction in the use of the most hazardous pesticides
(C) Lessening the chance of pesticide resistance developing
(D) Total elimination of pest species
(E) All of the choices are benefits of integrated pest management. - Which of the following statements about the role of carbon dioxide (CO 2 )
in the carbon cycle are TRUE?
I. Carbon dioxide is produced during photosynthesis.
II. Carbon dioxide concentration in the atmosphere decreases when
trees are cut down and the trees decay.
III. The primary nonanthropomorphic source of carbon dioxide is
outgassing from Earth’s interior.(A) I only
(B) II only
(C) III only
(D) II and III only
(E) I, II, and IIIQuestions 49 and 50 refer to the following air pollutants.
(A) Nitrogen dioxide (NO 2 )
(B) Peroxyacl nitrates (PANs)
(C) Volatile organic compounds (VOCs)
(D) Ozone (O 3 )
(E) Particulates (PM 10 )