Environmental Biotechnology Questions and Answers – Treatment of Hazardous Wastes

This set of Environmental Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Treatment of Hazardous Wastes”.

1. Which of the following characteristics is not important to hazardous wastes?
a) Quantity
b) Concentration
c) Color
d) Physical or chemical properties
View Answer

Answer: c
Explanation: Quantity, concentration, physical or chemical properties or infectious characteristics are important to hazardous wastes as they define their properties and categories them into solid wastes that are hazardous to the next environment or humans. But color is not a very important property to define the characteristics of hazardous wastes as it doesn’t interfere with the property.

2. Which of the following is not an ill-effect of improper handling of hazardous waste?
a) Increase in mortality rate
b) Irreversible illness
c) Threat to the environment
d) Decrease in mortality rate
View Answer

Answer: d
Explanation: Increase in mortality rate, irreversible illness, threat to the environment and humans when not disposed of properly are several ill-effects of improper handling of hazardous waste. But this definitely doesn’t decrease the mortality rate as it poses serious threats and potential hazard to human health.

3. It is the responsibility of the civilians to take care of the disposed of hazardous wastes.
a) True
b) False
View Answer

Answer: b
Explanation: It is the prime responsibility of the operators or the occupier or the dweller to take care of the hazardous wastes, its disposal and handle it properly to avoid its adverse effect on the environment and human health under the law set by the Indian government.

4. Which of the following is not a serious hazardous characteristic of the waste?
a) Toxicity
b) Ignitability
c) Corrosiveness
d) Degradability
View Answer

Answer: d
Explanation: Degradability is not a hazardous characteristic of the waste; it is always a good approach if the waste can be degraded safely without causing any major damage to the environment. But toxicity, ignitability, corrosiveness and reactivity are a few serious hazardous characteristics of the waste, which if not treated poses serious health hazards and environmental damage.

5. Which of the following is not a hazardous waste of petrochemical processes?
a) Tarry residue
b) Oily sludge
c) Slop oil
d) Vegetable oil
View Answer

Answer: d
Explanation: Tarry residue, oily sludge, slop oil, spent catalyst, organic residues, etc. are the hazardous waste of petrochemical processes which should be handled correctly and disposed of carefully without causing any damage to the environment. Vegetable oil doesn’t pose any threat as it’s a kitchen waste and not waste of petrochemical processes.
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6. Which of the following is not generated in waste treatment processes?
a) Sludge
b) Ash
c) Organic solvents
d) Noise
View Answer

Answer: d
Explanation: Noise is not a waste that is generated in the waste treatment processes as it is a sound which affects the environment but physically doesn’t. And it is not generated in waste treatment processes. Whereas, sludge, ash, organic solvents are generated during various processes like incineration, wet scrubbers, distillation etc. These are generated in waste treatment processes and can be a serious threat to the environment if not disposed of properly.

7. In provision of the rules, which of the following is not appropriate with respect to the hazardous wastes?
a) Packaging
b) Labelling
c) Transport
d) Very expensive
View Answer

Answer: d
Explanation: Packaging, labelling and transport of hazardous wastes should be done properly in order to avoid any hazardous contamination of the wastes with the environment and with humans. But the cost price of the waste is irrelevant here as these factors deals with the handling of the wastes.

8. Spent hardening salt is a potentially hazardous waste in which of the following processes?
a) Hardening of steel
b) Hardening of rock salt
c) Hardening of gold
d) Hardening of coal
View Answer

Answer: a
Explanation: Hardening of steel generates a hazardous waste i.e. Spent hardening salt, cyanide, nitrate and nitrate sludge which is very much hazardous to the environment and human health, so, it should be disposed of properly. But Hardening of rock salt, hardening of gold, hardening of coal doesn’t produce the wastes listed above because of different processing.

9. Which of the following combination methods can be used to process the hazardous wastes?
a) Landfill
b) Solidification
c) Incineration
d) Chemical oxidation
View Answer

Answer: a
Explanation: Solidification, incineration, chemical oxidation, aerobic oxidation or anaerobic fermentation are the combination methods that can be used to process the hazardous wastes, designed to treat or dispose of the hazardous wastes safely. But landfill is also a method used to dispose of the hazardous waste but it is not a combination method.

10. What can be a hazardous waste in the purification processes for organic solvents?
a) Spent carbon
b) Methane
c) High water content
d) Less water contents
View Answer

Answer: a
Explanation: Hazardous waste in the purification processes for organic solvents usually generate wastes like spent carbon, spent catalyst and filters with organic liquids in them. Methane, high water content, less water content, are the wastes generated in other treatment methods and not in the purification processes for organic solvents.

11. Flue gas dust is a hazardous waste of zinc production.
a) True
b) False
View Answer

Answer: a
Explanation: Flue gas dust is a hazardous waste of the secondary zinc production specifically as, the hazardous waste in the production processes usually generate wastes like zinc fines, dust, ash and sludge and filter press cake out of zinc sulphate. Other wastes from zinc ash/gliding are also generated.

Sanfoundry Global Education & Learning Series – Environmental Biotechnology.

To practice all areas of Environmental Biotechnology, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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