Occupational Health and Ergonomics Q&A PDF

Occupa onal Health and Ergonomics Q&A Ques ons 1. Which of the following is the most common occupa onal disease? a) Siderosis b) Asbestosis c) Derma s d) Glanders Ans) C 2. Exposure to petroleum products, grease, and solvents account for the most probab...

Occupa onal Health and Ergonomics Q&A Ques ons 1. Which of the following is the most common occupa onal disease? a) Siderosis b) Asbestosis c) Derma s d) Glanders Ans) C 2. Exposure to petroleum products, grease, and solvents account for the most probable cause of which of the following occupa onal disease? a) Derma s b) Carpal Tunnel syndrome c) Glanders d) Siderosis Ans) A 3. Which of the following statements BEST describes Cumula ve Trauma Disorders (CTD)? a) Disorders caused a result of repeated movement of body parts b) Disorders caused as a result of exposure to chemicals over a rela ve long period of me c) Mental and psychological disorders developed over a period of me as a result of work related stress. d) Any disorder, physical or psychological, which is work related and has a cumula ve effect over a given period of me. Ans) A 4. Assuming that NIOSH recommended Weight Limit (RWL) is 16lb. What is the Li Index (LI) for li ing a 22lb weight? a) 1.375 b) 0.727 c) 1.896 d) 2.749 Ans). A 5. A pocket dosimeter is a device that is used to measure employee exposure to which of the following? a) Radia on b) Noise c) Vibra on d) Airborne hazardous chemicals concentra on Ans). A 6. A container has dimensions of 20 x 20 x 10 feet and contains nitrogen. Assume that 18.9 3 of carbon dioxide (CO2) is released into this container. The concentra on of CO2 expressed in volume frac on is: a) 2.3 b) 0.006 c) 0.0047 d) 0.65 Ans) C 7. In the control of heat stress, an increase in air velocity a) Increases heat transfer rates by convec on b) Decreases heat transfer rates by convec on c) Heat transfer is only depended on the temperature of air d) Increases heat transfer rate by conduc on Ans) A 8. Dilu on ven la on is best suited for which of the following situa ons? a) When highly inflammable gaes are present b) When highly toxic air contaminants are present c) When air contaminants are not highly flammable or toxic and are not produced at high rates d) When contaminants that are toxic or flammable are produced by a fixed source Ans) C 9. A solvent is evapora ng at the rate of 0.9 3/min in a room having dimensions of 20 x 15 x 10. The ven la on rate in the room is 1,500 3/min. Assuming STP condi ons, the concentra on of solvent vapor in a room a er two hours is? a) 300ppm b) 600ppm c) 0.06ppm d) 0.5ppm Ans) B 10. When designing or opera ng a local exhaust system, one important factor is : a) That the system fails if any fugi ve emissions occur b) Design to remove all emi ed contaminants c) The exhaust air volume flow rate must be propor onal to the contaminant genera on rate. d) Local exhaust systems do not provide dilu on ven la on Ans) B 11. What is the noise dose for a worker who is exposed to 95dBA source for a period of 5 hours? a) 165% b) 125% c) 93% d) 315% Ans) B 12.In a machine shop, a worker is exposed to the following levels of noise: Noise Leve, dBA Dura on, Hours 91 3 105 1 98 2 The noise dose expressed in percentage of the OSHA permissible exposure is  a) 423% b) 87% c) 219% d) 215% Ans) C 13.The cochlea is the main element of the: a) Inner ear b) Middle ear c) Outer ear d) Tympanic membrane Ans) A 15. Noise Induced Hearing Loss(NIHL) results from over-exposure to high levels of noise. NIHL depends on sound intensity and the exposure me. Which of the following statement is generally true regarding NIHL? a) High frequency noise is more damaging b) Low frequency noise is more damaging c) NIHL depends only om the sound intensity and me of exposure. d) Only (b) and (C) above Ans) A 16. Which of the following statements is true regarding radioisotops of a given material which are capable of radioac ve decay.? a) Same atomic number but different atomic mass b) Same atomic number and same atomic mass c) Different atomic number, different atomic mass d) Different atomic number, same atomic mass Ans). A 17. The half-life of Radon 222Rn86 is 3.8 days. If we start with one gram of radon, how many days would it take to reduce the weight to 1/16 of a gram? a) 7.6 b) 11.4 c) 15.2 d) 19.0 Ans) C 18. The amount of radia on emi ed by a source at 2feet away from the source is 0.06rem. What level of radia on we expect to measure at 6 feet away from the source? a) 0.02 b) 6.66x10-3 rem c) 0.12 rem d) 0.18 rem Ans) B 19. A Geiger-Mueller radia on measuring instrument is suitable for measuring which of the following types of ionizing radia on? a) Gamma Rays b) Alpha Rays c) Beta Rays d) All of the above Ans) d 20. Erythema is caused by: a) Over-exposure to beta rays b) Over-exposure to sensi zers c) Over- exposure to materials having high flash point d) Over-exposure to sunlight Ans) D 21. Scotoma which is loss of vision in a por on of the visual field is most likely to be caused by which of the following types of non-ionizing radia on? a) RF Radia on b) Microwave c) Infrared d) Ultraviolet Ans) C 22. Simple asphyxiant are those chemicals which: a) Can interfere with normal haemoglobin func on and deprive the body of oxygen. b) Cause suffoca on by reducing oxygen concentra on. c) Are inert gases but once in the body are more reac ve with blood than oxygen. d) Only (a) and (c) above. Ans) B