Free CIH Practice Test

In order to become certified as an industrial hygienist, one must pass the Certified Industrial Hygienist (CIH) exam developed by the American Board of Industrial Hygiene. This exam is designed to ensure that certified individuals will have reached a high level of training and professional achievement. The exam consists of 250 multiple-choice questions, to be answered during two 3 1/2 hour sessions. The questions on the examination will come from the following eight content domains: basic sciences; occupational disease, illness, injury, and surveillance; health hazards; work environments; program management principles; evaluation practices; hazard controls; and community stressors.

The examination is completed on a computer, and students will be provided with a list of basic equations, the precise content of which can be found at the American Board of Industrial Hygiene website. Candidates will receive a verdict of pass or fail immediately after the examination. Scoring is based on the number of questions answered correctly, with no penalty for incorrect answers. For this reason, candidates are advised to make the best guess on those questions they do not know for certain. The CIH exam is offered in the spring between April 1 and May 31 and then the fall between October 1 and November 30. The exam is administered by Thomson Prometric at locations around the country; prospective candidates should register at the American Board of Industrial Hygiene website.

Practice Questions

1. Which of the following is NOT a common symptom of pneumoconiosis?

  1. Hypertension
  2. chronic cough
  3. cyanosis
  4. dyspnea

2. The employees of a factory are exposed to noise of 95 dB for three hours, 90 dB for two hours, and 100 dB for one hour. The rest of the noise exposure is less than regulated levels. What calculation will be used to determine whether the factory is in compliance with OSHA noise regulations?

  1. 95/3 + 90/2 + 100
  2. 3/95 + 2/95 + 1/100
  3. 4/3 + 8/2 + 2
  4. + 2/8 +1/2

3. Which of the following temperature measurements is required to determine whether a work environment is likely to cause heat stress?

  1. dry bulb temperature
  2. globe temperature
  3. natural wet bulb temperature
  4. All of the above

4. If 20 mg of a narcotic substance causes a rat weighing 200 g to sleep for two hours, approximately what dose would be required to produce the same effect on a 100 kg person?

  1. 1 g
  2. 10 g
  3. 10 kg
  4. 100 mg

5. In metallurgy, what is the name of the process in which a metal is produced from ore by leaching and then plating onto a cathode?

  1. electrowinning
  2. sintering
  3. pickling
  4. electrolytic purification

Answers

1. A: Hypertension, or high blood pressure, is not a common symptom of pneumoconiosis. Pneumoconiosis is an umbrella term for the damage sustained by those who have inhaled solids. When it is suffered by miners, it is commonly known as black lung disease. The chronic cough, often associated with bronchitis or heart trouble, is associated with pneumoconiosis. Cyanosis is a shortage of oxygen. Dyspnea is shortness of breath.

2. D: The calculation that must be used here is + 2/8 + ½ = 1 ½. Because this value is greater than one, the factory is not in compliance with OSHA noise regulations. Compliance is determined by adding up a series of fractions, in which the numerator is the time exposed at a given level and the denominator is the permissible time of exposure at that level. Workers may only be exposed to sound at 95 dB for four hours per day, to sound at 90 dB for 8 hours per day, and to sound at 100 dB for 2 hours a day.

3. D: Dry bulb temperature, globe temperature, and natural wet bulb temperature are all required to determine whether a work environment is likely to cause heat stress. These three measures are required to create the Wet Bulb Globe Temperature index. Dry bulb temperature is the measure obtained with an ordinary thermometer. Globe temperature is obtained by inserting the thermometer bulb into a small copper sphere painted black on the outside. Typically, globe temperature will be higher than dry bulb temperature. Natural wet bulb temperature is obtained by using a thermometer with a wick that transports water to the thermometer bulb. Typically, the evaporation of this water will cool the bulb, so the wet bulb temperature is usually lower than the dry bulb temperature.

4. B: If 20 mg of a narcotic substance causes a rat weighing 200 g to sleep for two hours, approximately 10 g would be required to produce the same effect on a 100 kg person. This calculation requires two steps. To begin with, it is necessary to calculate the dose rate for the substance. The dose rate is typically expressed in mg/kg, so in this case the calculation is performed 20 mg/200 g x 1000 g/1 kg = 100 mg/kg. The next step is to apply this dose rate to a person of the given size: 100 mg/kg x 100 kg = 10,000 mg, or 10 g.

5. A: In metallurgy, electrowinning is the name of the process in which the metal is produced from ore by leaching and then plating onto a cathode. In electrowinning, ore is leached with a dilute sulfuric acid. Copper is then stripped from this solution into a kerosene solution using a phenolic agent, then re-extracted into sulfuric acid as a concentrated solution. Finally, copper is plated out of the solution, and the acid is recycled back through the extraction process. Sintering, meanwhile, is the process of heating ore with flux to burn off sulfur. Pickling is the process of cleaning a metal surface with acid. Electrolytic purification is the process of extracting pure metal at the cathode from an impure metal anode or an ore.

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Last Updated: 03/01/2017


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