REHS Exam Preparation Questions and Correct Answers

1. A factor or agent which increases the risk of cancer is known as a a. teratogen b. mutagen c. carcinogen d. fomite carcinogen 2. The four major causes of death among all age groups of Americans include all of the following except. a. homicide b. accidents c. malignant neoplasms d. heart disease homicide 3. In recent years, the largest number of rabies cases were associated with a. skunks b. bats c. dogs d. raccons. skunks 4. Asbestosis is caused by fine silicate fibers retained in the a. kidneys b. lungs c. colon d. abdomen lungs 5. An illness due to a specific infectious agent or its toxic product which is transmitted from a reservoir to a susceptible host either directly or indirectly is called a. an infectious disease b. a communicable disease c. a genetic disease d. a noncommunicable disease a communicable disease 6. Rocky mountain spotted fever is spread by a. flies b. spiders c. cockroaches d. ticks ticks 7. Mycotoxins are poisonous chemicals produced by a. bacteria b. vertebrates c. viruses d. fungi fungi 8. The study of the occurrence, frequency, and distribution of disease is a. entomology b. biology c. endocrinology d. epidemiology epidemiology 9. Which of the following organisms are most resistant to unfavorable environmental conditions and indicate past or possibly intermittent pollution? a. fecal streptococci b. escherichia coli c. aerobacter aerogenes d. clostridium sporulates clostridium sporulates 10. Engineering controls are a. controls that isolate or remove hazards from the work place b. less effective than good training c. the last option that should be considered d. less effective than personal protection processes controls that isolate or remove hazards from the workplace 11. Which of the following is not considered a satisfactory solution to the problem of chemical contamination in Well systems? a. abandoning the well b. boiling the water c. building a new, properly constructed, drilled well boiling the water 12. Which of the following chemicals is most widely used to destroy microorganisms? a. chlorine b. copper sulfate c. chloramine d. hydrogen sulfate chlorine 13. Which of the following is not a practical method for removal of cadmium? a. ion exchange b. lime softening c. reverse osmosis d. iron coagulation reverse osmosis 14. Which of the following is not a commonly accepted method of device to prevent backsiphonage? a. vacuum breakers b. cross-connections c. air gap separation d. back pressure units cross-connections 15. This substance is the first product of the decomposition of organic matter. Its presence in water usually Indicates "fresh pollution" of sanitary significance. What is it? a. ammonia b. sugar c. carbon dioxide d. hydrogen sulfide ammonia