Railway Science (Environment – Environmental Wastes)

Total Questions: 37

31. What is the best method to dispose of hospital waste? [RRC Group D 28/09/2022 (Afternoon)]

Correct Answer: (b) Sterilise and separate metals from cotton
Solution:

Biomedical waste or hospital waste is any kind of waste containing infectious (or potentially infectious) materials. Incineration is a waste treatment process that involves the combustion of substances contained in waste materials. Other biomedical waste disposal methods - Microwave irradiation, Land disposal, Chemical disinfection, etc.

32. The ideal waste disposal method in case of metal is: [RRC Group D 06/10/2022 (Morning)]

Correct Answer: (b) recycling
Solution:

Composting is a controlled, aerobic (oxygen-required) process that converts organic materials into a nutrient-rich soil amendment or mulch through natural decomposition.
Reusing helps sustain the environment for future generations. Reduces the amount of waste that will need to be recycled or sent to landfills and incinerators.
Both combustion and incineration refer to burning, but the application of the term is different. The term combustion refers to a chemical reaction, while incineration refers to the destruction of material such as waste.

33. What is the primary difference between domestic and industrial solid waste? [RRC Group D 06/10/2022 (Afternoon)]

Correct Answer: (d) The former is heterogeneous in composition.
Solution:

Domestic waste is produced in the home. Examples - organic, toxic, recyclable, and soiled. Industrial waste is produced by industries, manufacturing processes, and resource extraction. E-waste needs to be brought to a specialised recycling centre – not placed in a kerbside bin. Landfill site - An area of land used to dump domestic waste.

34. Match the columns. [RRC Group D 07/10/2022 (Morning)]

Correct Answer: (a) I-B; II-A; III-C

35. When we consider biodegradable substances, we see that the common property is that _______. [RRC Group D 11/10/2022 (Afternoon)]

Correct Answer: (c) they are all biological in origin
Solution:

A biodegradable substance or material is one that may quickly break down by bacteria or any other natural organisms without contributing to pollution. Examples: leftover foodstuffs, kitchen waste like fruits and vegetable peels, etc.

36. The best practice that is involved in biological waste disposal is: [RRC Group D 11/10/2022 (Evening)]

Correct Answer: (a) incineration
Solution:

The process of burning hazardous materials at temperatures high enough to destroy contaminants.

37. What is the colour code of the dustbin in which non-biodegradable wastes are kept? [RRB NTPC CBT - I (08/03/2021) Evening]

Correct Answer: (c) Blue
Solution:

Types of dustbins: Blue Dustbin (contains recyclable and non-biodegradable wastes) - It is used to collect dry and recyclable wastes. Example - Newspapers, paints, aerosol cans, lights, broken bulbs, plastic bottles, gift wrappers.
Red Dustbin (contains non-recyclable and non-biodegradable wastes) - It is used to collect biomedical wastes. Example - Needles, surgical knives, cotton dressings, pop casts, tissues, sanitary napkins etc.
Green Dustbin (contains recyclable and biodegradable waste) - It is used to collect organic and wet wastes. Example - fruits, vegetables and peels, coconut shells, tea bags etc.