Interview Questions Answers CHEMICALS
3. To
signal necessary precautions.
4. To comply with regulations.
9. Q. Is the sniffing of chemicals a safe means of identification of them?
A. Chemicals should never be sniffed as a means of identification, as some chemicals can be harmful even below the threshold of smell.
10. Q. Give two possible hazards that may be encountered by people using Epoxy Resin.
A. 1. Hazardous Fumes.
2. Flammable Vapors.
3. Dermatitis
11. Q. Name two essential things you should do before working on a pipeline?
A. 1. Isolate it.
2.
Drain it.
3.
Clean it.
4. Determine Content.
12. Q. How would you neutralize spilt acid?
A. Use an alkali or plenty of water.
13. Q. Is Carbon tetrachloride a safe cleaning fluid, qualify your answer?
A. No, it is toxic.
14 Q. To what height should a fixed vessel containing a dangerous material be fenced?
A. 3 feet or 0.92 m.
15 Q. Name two measures that should be provided to immediately limit the effect of an exposure to corrosive liquids?
A. 1.. Means of drenching persons with cold water.
2. Eye wash bottles.
16.. Q. Name two measures that should be provided to immediately l the effect of an exposure to corrosive liquids?
A. Petrol
17. Q. In a mixture of Alcohol and water, which liquid will be on top?
A. Neither, they Mix.
18 Q. In a mixture of Mercury and water, which liquid will be on top?
A. Water.
19. Q. In safety circles what does P.P.E. mean?
A. Personal Protective Equipment
20. Q. What does the risk phrase R45 mean?
A. May cause cancer.
21. Q. What does the risk phrase R40 mean?
A. Possible risk of irreversible eff
22. Q. What does the risk phrase R61 mean?
A. May cause harm to the unborn child.
23. Q. What is the meaning of the term T.W.A. explain your answer?
A. Time Weighted Average. - It is a measure of the average exposure to a chemical agent for a conventional 8 hour day/ 40 hour week.
24. Q. What is the term used to express the airborne concentration of substances and conditions under which it is believed that most workers may be repeatedly exposed day after day without adverse effect?
A. Threshold Limit Value.
25. Q. Where clothes contaminated with a toxic substance have to be laundered, what should be done before they are sent to the laundry?
A. They should be detoxified before being set to the laundry.
26. Q. How would you describe a substance which may on contact with living tissue destroy it, and what sign is used to indicate this substance?
A. Corrosive - This is depicted by a test tube pouring drops of liquid onto a material with fumes rising from the material.
27. Q. How would you describe a substance which if ingested or inhaled may be deemed more than harmful and an irritant in terms of harming you, and what sign is used to indicate this substance?
A. Toxic or Poisonous - This is depicted by Skull and Crossbones.
28. Q. How would you describe a substance which may on contact with flame, heat, or l spark, burst into flame and what sign is used to indicate this substance?
A. Flammable - This is depicted by tongues of flame.
29. Q. What four precautions must be taken before allowing repairs to proceed on an unidentified pipeline in a chemical plant?
A. 1. Identify the line and its contents.
2. Isolate
and depressurize the line.
3. Drain
and flush the line.
4. Gas
free the line if necessary.
5. Issue a permit to work to cover the specific repair.
30. Q. Give the meaning of the four following chemical industry terms, Aqueous, Immiscible, Inert, and Emulsion?
A. Aqueous:- Contains Water.
Immiscible:- Does not mix.
Inert:- Non Reactive.
Emulsion:- Suspension in liquids
31. Q. Give four possible hazards associated with the use of gas cylinder?
A. 1. Some gases are stored at high pressure.
2. Leaks of flammable or toxic gases.
3. Gas cylinders exposed to high temperature.
4. Liquid flow from acetylene cylinders.
5. Lack of Cylinder Identification.
6. Handling and transporting heavy cylinders.
32. Q.
A.1. Ingestion.
2.Inhalation.
3.Absorption.
4. Injection.
33. Q. Give four ways by which you may express the concentration of air conta?
A.1. Parts per Million.
2. Milligrams per Litre.
3. Percentage by Volume.
4. Milligrams per Cubic Mtr.
34. Q. What is the % oxygen in the air?
A. 21%
35. Q. What are the safe oxygen limits for entry to a confined space without an air supply?
A. Not less than 19% but it is important to
know what has reduced the oxygen level.
36. Q. Name a common solvent which reacts violently with Bromine?
A. Acetone.
37. Q. What would you use to treat a bromine spillage?
A. 10% Sodium Thiosulphate.
38. Q. What gas can be formed if acid comes in contact with Sodium Cyanide?
A. Hydrogen Cyanide.
39. Q. What is the term used to describe substances which pose a hazard to the environment?
A. Ecotoxic
40. Q. Acute toxicity tests give data on the effects of a short-term exposu to a substance. What is the most commonly quoted test of acute toxicity?
A. LD 50 (Lethal Dose 50) in mg/kg.
41. Q. What is the word used to describe a chemical reaction which absorbs heat?
A. Endothermic Reaction.
42. Q. What is the word used to describe a chemical reaction which gives out heat?
A.
Exothermic Reaction.
43. Q. The OEL (8Hr) for Phenol is 2 ppm and is followed by a "skin" designation.What does this mean?
A. A potential exposure route is via skin absorption including mucous
membranes and eyes.
44. Q. There has been much media attention focused on the risks associate with Organophosphorus compounds used in connection wi particular work activity. Can you name the activity?
A. Sheep Dips used to control parasitic problems in sheep.
45. Q. Benzene, which is a known human carcinogen, is found in concentrations upto 1% in a material in wide scale daily use. Can you name the material?
A. Petrol.
46. Q. Many dangerous materials are required by European Community Directives to have a Tactile Warning of Dang packaging. What is meant by this and whom does it aid?
A . A roughened or embossed area which when touched by a blind or partially sighted person alerts them to the dangerous nature of the material. .
47. Q. What is the difference between hazard and hazardous?
A .a) Hazard is the potential to cause harmful effects,
b) Hazardous means potentially harmful.
48. Q. What is the difference between toxic and toxicity?
A.
a) Toxic means the ability to cause harmful
health effects,
b) Toxicity is a measure of the degree to which something is toxic.
49. Q. Three of the following gases are flammable, name them?
A.. 1. Acetylene.
2. Carbon Dioxide.
3. Carbon Monoxide.
4. Chlorine.
5. Chloroethane.
6. Chlorotetrafluromethane.
A.1, 3 & 5.
50 Q. Three of the following gases are flammable, name them?
A .1.
Ethylene.
2.
Phosgene.
3. Hydrogen Chloride
4. Hydrogen Cyanide.
5.
Hydrogen
Oxide.
6. Propylene. A. 1, 4 & 6.
51. Q. Three of the following gases are flammable, name them?
A. 1.
Ammonia.
2.
Butane.
3.
Chlorodifluromethane.
4.
Cyclopropane.
5.
Dichlorodifluromethane.
6. Helium. A. 1, 2 & 4.
52 Q. Name three of the factors on which the severity of a chemical burn depends?
A.1. Corrosiveness of the chemical.
2. Concentration of the chemical.
3. Temperature of the chemical.
4. Duration of contact.
5. Area or extent of the burn.
53 Q. The term LD 50 is often recorded in data dealing with to x chemicals. What does it signify?
A. Lethal Dose - 50% Kill. i.e. the dose that killed 50% of the test animals.
54 Q. The term S.T.E.L. is used in relation to the amount of Chemical Exposure of Persons. What does it mean and what periods are involved?
A. 1. Short Term Exposure Limit.
2. 15 Minute Periods.
55 Q. Occupational Exposure Limits (OEL's) are normally expressed in terms of applying to either short or longer times of exposure. What are the two time periods that may be involved?
A. 15 Minutes or 8 Hours.
56 Q. Industrial solvents have many uses. Give the 2 most common hazards to a person you might expect, giving a reason in each case associated with these solvents?
A.
1. Fire Risk Solvents can be very
volatile and vapours easily attain their flammable range.
2. Damage to Health.They may be Toxic, Narcotic, Irritant, or have othersystemic effects.
57. Q. What is a fume cupboard?
A. A special ventilated and enclosed area in which laboratory work with harmful gases and vapours can be carried out safely.
58. Q. State the correct procedure for diluting concentrated sulphuric acid with water, and explain the hazards should this procedure reversed?
A. 1. Add the acid slowly to the water
while stirring continuously.
2. If
water is added to the acid an Exothermic (Heat Releasing) Reactionoccurs.This
can be violent if the water is added rapidly.
59. Q. A cryogenic fluid is one whose vapour must be cooled below room temperature before it can be liquefied by an increase in pressure. Which if any of the following substances are cryogen fluids?
A. 1.
Hydrogen.
2.
Oxygen.
3. Nitrogen. A. All.
60. Q. A cryogenic fluid is one whose vapour must be cooled below room temperature before it can be liquefied by an increase in pressure. How many if any, of the following are cryogenic fluids?
A . 1.
Carbon
Monoxide.
2.
Carbon
Dioxide.
3. Ozone. A. All
61. Q. Both Sodium and Phosphorus ignite spontaneously in air. How should they be stored, and can they be stored together?
A. Sodium must be stored under paraffin, Phosphorus under water. They should not be stored near each other as confusion would be dangerous - Sodium reacts violently with water
.
6 2 . Q. What do you understand by the following terms (a) Acute Toxicity(b) Chronic toxicity?
A. (a) Acute Toxicity refers to the situation where a substance produces harmful effects quickly i.e. Seconds, Minutes, Hours.
(b) Chronic Toxicity refers to the situation where a substance produces harmful effects in a long period of time i.e. Month of years.
63. Q. Bromine is regarded as a particularly dangerous chemical in the laboratory. Give three reasons for this assumption?
A. 1. High Density.
2. Highly Corrosive.
3. Reacts Violently with many materials Can be absorbed through the skin.
3. It
could be flammable.
4. It
could scald.
5. It
could create a slipping hazard.
6. It
may cause an electrical short circuit.
7. It
may react chemically with material on the floor.
A.
1. Gases - Gas Cylinders, Compressors
etc.
2. Vapours
- Solvents, Paint, Dry Cleaning etc.
3. Aerosols - Spraying Liquids etc.
4. Liquids
- Spills, or Splashes etc.
67. Q. What hazards result from a mercury spill, and how should these hazards be dealt with?
A. 1. Mercury vapour, which is highly toxic, exists in the air above the spill, hence it is a significant respiratory hazard.
2. The mercury should be collected with appropriate equipment or chemical neutralised.
68. Q. What is the maximum level of combustible gas permitted in he area where a hot work permit is in operation ?
A. 1. Not more than 20% of lower flammable
limit.
A. 1. Potassium Metal.
2. Sodium Chloride.
3. Sodium Metal.
4. Mercury.
5. Silicon Carbide
6. Sodium Cyanide.
A.1 & 3.
70. Q. The Saint Andrew’s Cross (X) symbol with a dotted i associated is an indicator of a substance being explicitly less hazardous than a?
A. (1)Toxic
Substance.
(2)Flammable
Substance.
(3)Corrosive Substance. A.
71 Q. what is the full name of the regulations to chemicals? A. The “Safety, Health and Welfare at Work (Chemical Agents) Regulations 2001” (S.I. 619 of 2001).,
72. Q. What does OELV stand foe andhow is it defined within the 2001 regulations?
A. .(a) “occupational exposure limit value"
(b) means, unless otherwise specified, the limit of the average of the concentration of a chemical agent in the air within the breathing zone of a worker in relation to a specified reference period, a time- weighted afterwards approved by the Authority.
73. Q. What is the difference between (a) carcinogen, (b) carcinogenic and (c) carcinogenicity?
A. (a) A Carcinogen is a substance that can cause cancer. (b) Carcinogenic means able to cause.
(c) Carcinogenicity is the ability of a substance to cause cancer.
74. Q. The Chemical Agents Regulations 2001 oblige the employer to determine which hazardous substances are present in the workplace and assess the risk to employees and others, resulting from the presence of these chemicalagents.What specific actions must the employer take. Name three?
A. 1. Prevent and control exposure to hazardous chemical agent
2. Implement specific protection and prevention measures
3. Make arrangements to deal with accidents, incidents and emergencies Ensure that employees are properly informed, trained and supervised.
A.
1. Sensitization
2. Asthma
3. Skin
irritation or dermatitis
4. Cancer
5. Poisoning
6. Burns
7. Heritable genetic damage
8. Fertility impairment
9. Harm to the unborn child
10. Loss of consciousness
11. Eye irritation.
76. Q. There are two different types of occupational sensitization: skin and respiratory. List three typical symptoms of each?
A. Typical symptoms of skin sensitivity are:
1. swelling,
2. redness,
3. itching,
4. pain,
5. blistering.
Sensitization of the respiratory system may result in symptoms similar to a asthmatic attack. These symptoms include:
1. wheezing,
2. difficulty
in breathing,
3. chest
tightness,
4. coughing,
shortness of breath.
77. Q. What is meant by Health Surveillance as defined in the 2001 Chemical Agents Regulations?
A. The assessment of an individual employee to determine the state of health of that individual, as related to exposure to specific chemical agent at work and includes biological monitoring.
78. Q. What must a user of lead paint in Ireland do?
A.
The user of the lead paint in Ireland
needs to justify that they are using the paint to restore or maintain a work of
art or historic building.
79. Q. The Safety Data Sheet (SDS) is the EC term for the document giving health and safety information about a chemical. Current legislation a defined format containing 16 obligatory headings eight of the headings?
de
List
A. 1. Identification of the substance/preparation and of the company/ undertaking;
2. Hazards
identification;
3. Composition/information
on ingredients;
4. First-aid
measures;
5. Fire-fighting
measures;
6. Accidental
release measures;
7. Handling
and storage;
8. Exposure
controls/personal protection;
9. Physical
and chemical properties;
10. Stability
and reactivity;
11. Toxicological
information;
12. Ecological
information;
13. Disposal
considerations;
14. Transport
information
15. Regulatory
information
16.Other information
80. Q. In current CPL legislation there are 15 categories of classification of a dangerous preparation. List eight of these categories?
A.
In accordance with the classification
requirements of these Regulations, a dangerous substance or preparation must be
classified as one or more of the following:
Physiochemical Effects: -
1. Explosive,
2. Oxidising,
3. Extremely
flammable,
4. Highly
flammable,
5. Flammable
Toxicological Effects:
1. Very toxic,
2. Toxic,
3. Harmful,
4. Corrosive,
5. Irritant
6. Sensitising
Specific Effects on Human Health: -
1. Carcinogenic,
2. Mutagenic,
3. Toxic
for reproduction
Environmental
Effects: -
81. Q List five product categories that have full exemption from REACH the legislation? .
A.
1. Radioactive Substances
2. Substances
transported or under customs supervision
3. Waste
as defined in Directive 2006/12/EC
4. Substance
used exclusively as a non-isolated intermediate
A.
1. Frost Bite.
2. Respiratory
Ailments.
3. Chemical
Burns.
4. Low
temperature embrittlement of some metals.
5. Some
react violently when combined with other cf's
6. Some
react violently when combined with their surroundings.
83. Q. Give eight safety recommendations which should be a chemical store?
A. 1. The chemicals should be stored by
categories ie Corrosive,Toxic, Reactive, Flammable etc.
2. Do not have shelves above shoulder height.
3. Separate all reactive and non-compatibles.
4. Provide
an adequate ventilation system.
5. Fire
fighting equipment should be designed specifically for the store andit’s
contents
6. The
store structure should be fire resistant.
7. The
contents should be identified and listed externally.
8. Safety showers and eye
wash facilities must be provided.
9. Electric services to flame proof standard
1.
.
Comments
Post a Comment