Match List I with List II List I (Toxic Metal of MSW) List II (Source) A. Arsenic I Paints B. Lead II Rubber products C. Mercury III Wood preservatives D. Zinc IV Fluorescent lamps Choose the correct answer from the options given below:
A - III, B - I, C - IV, D - II
Understanding Toxic Metals in Municipal Solid Waste (MSW)
Municipal Solid Waste (MSW) often contains various toxic metals that can pose environmental and health risks if not managed properly. Identifying the sources of these metals in MSW is crucial for effective waste management and pollution control.
Matching Toxic Metals with Sources in MSW
The question asks us to match specific toxic metals found in MSW (List I) with their common sources (List II). Let's analyze the provided matches:
- Arsenic (A) is commonly found in Wood preservatives (III).
- Lead (B) is often present in old Paints (I).
- Mercury (C) is a key component in Fluorescent lamps (IV) and other electrical devices.
- Zinc (D) can be found in various sources, including Rubber products (II).
Based on this analysis, the correct matching is A - III, B - I, C - IV, D - II.
Detailed Explanation of Matches
Let's look closer at each toxic metal and its source in MSW:
- Arsenic (A) from Wood Preservatives (III): Chromated copper arsenate (CCA) was historically a widely used wood preservative. Although its use has been restricted in many residential applications, older treated wood items entering the waste stream can contribute arsenic to MSW.
- Lead (B) from Paints (I): Lead-based paints were commonly used in homes and other structures for many years. As buildings are renovated or demolished, debris containing lead paint enters MSW.
- Mercury (C) from Fluorescent Lamps (IV): Fluorescent lamps contain a small amount of mercury vapor necessary for their operation. When these lamps break or are discarded, mercury can be released into the environment. Other sources include certain batteries and electrical switches.
- Zinc (D) from Rubber Products (II): Zinc oxide is widely used as an activator, reinforcing agent, and curing agent in the production of rubber products like tires, footwear, and various molded goods. Discarded rubber items can be a source of zinc in MSW.
Here is a summary table of the correct matches:
| Toxic Metal (List I) | Source (List II) |
|---|---|
| Arsenic (A) | Wood preservatives (III) |
| Lead (B) | Paints (I) |
| Mercury (C) | Fluorescent lamps (IV) |
| Zinc (D) | Rubber products (II) |
Revision Table: Toxic Metals and Sources in MSW
| Toxic Metal | Primary Source in MSW |
|---|---|
| Arsenic | Wood preservatives |
| Lead | Paints, Batteries, Ceramics |
| Mercury | Fluorescent lamps, Thermometers, Batteries, Switches |
| Zinc | Rubber products, Batteries, Galvanized materials |
Additional Information on Toxic Metals in MSW
Toxic metals in MSW are a concern because they do not break down in the environment. When waste is landfilled, these metals can leach into the soil and groundwater, potentially contaminating drinking water sources. Incineration can release volatile metals like mercury into the air or concentrate non-volatile metals in the ash, which then requires special handling. Proper waste sorting, recycling (e.g., for batteries, fluorescent lamps), and managing hazardous waste streams separately are essential to mitigate the risks associated with toxic metals in MSW.
Other toxic metals sometimes found in MSW include Cadmium (from batteries, plastics) and Chromium (from leather, pigments).
Important Questions from People
Given below are two statements :
Statement I: Michael Polanyi, a physical chemist and philosopher of science, has argued that our explicit knowing depends on a vast subterranean layer of tacit human knowing.
Statement II: According to Polanyi, "If we did not have bodies and selves" we could not know any of what we know at an articulate conceptual, logical, empirical level".
In the light of the above statements, choose the most appropriate answer from the options given below :
Given below are two statements :
Statement I : Interrogative education begins with the premise that we are embedded in a communal reality.
Statement II : We cannot know this communal reality truly and well unless we ourselves are consciously and actively in community with it as knowers.
In the light of the above statements, choose the most appropriate answer from the options given below :
Match List I with List II
List I (Pollution Source)
List II (Category)
A.
Sewage
I.
Thermal Pollution
B.
Agriculture fertilizers
II.
Sediments
C.
Land Erosion
III.
Oxygen demanding waste
D.
Power Plants
IV.
Plants Nutrients
Choose the correct answer from the options given below:Through enrichment process, concentration of which uranium isotope is increased in the natural uranium?
Who among the following thinkers observed that light and heat are only different forms of the same essential substance and also speaks of gravity as the cause of falling?
