Environment

The disposal of nuclear waste is a critical environmental issue that requires careful consideration to ensure safety and prevent contamination. The correct method for managing and disposing of this waste is crucial in minimizing potential hazards. Let's analyze the options provided:

1. Shoot the waste into space: Although this method could theoretically remove nuclear waste from Earth, it is highly impractical and risky. The cost of launching waste into space is prohibitive, and there is a considerable risk of an accident during launch. An accident could lead to radioactive contamination in the atmosphere.
2. Bury the waste under Antarctic ice-cover: This option poses significant environmental risks. The Antarctic ice is subject to movement and melting, especially due to climate change. Burying waste in such an unstable environment could lead to leaks and contamination of the environment.
3. Dump the waste within rocks under deep ocean: Oceanic disposal poses potential hazards to marine life and the ecosystem. The possibility of leaks and the challenges of monitoring and access make this method unsuitable for the disposal of nuclear waste.
4. Bury the waste within rocks deep below the Earth's surface: This method is considered the most suitable and widely recognized as the best practice for nuclear waste disposal. Deep geological disposal involves isolating radioactive waste in stable geological formations deep underground. This method minimizes the risk of radiation exposure and environmental contamination over long periods. The depth provides a natural barrier to radioactive emissions.

The most suitable method, backed by scientific consensus, is burying the waste within rocks deep below the Earth's surface. This method ensures long-term isolation from the biosphere and is designed to contain radioactive materials even through natural events such as earthquakes.

In conclusion, safe geological disposal prevents nuclear waste from posing health and environmental risks, making this method the preferable choice for effective nuclear waste management.

The question asks about the application of Polyblend, a fine powder made from recycled modified plastic. To determine the correct use of Polyblend, let's analyze each option:

1. Making plastic sacks: Plastic sacks are commonly manufactured using new or recycled plastic materials rather than by employing fine powders like Polyblend. This option is unlikely because it does not align with traditional practices of creating plastic materials.
2. Use as a fertilizer: Fertilizers are typically made from organic materials or synthesized chemicals that provide essential nutrients to plants. Polyblend, being a recycled plastic, does not contain the necessary nutrients to be used as a fertilizer. Therefore, this option can be ruled out.
3. Construction of roads: Polyblend is indeed recognized as a valuable material in road construction. When mixed with bitumen, Polyblend enhances the properties of the road surface, making it more durable and less susceptible to water damage. This usage of recycled plastics in road construction has been successfully implemented in various parts of India, leading to improved road infrastructure. Thus, this option is correct.
4. Making tubes and pipes: While plastic is commonly used in manufacturing tubes and pipes, these products are generally made using solid plastic materials, not in powdered form like Polyblend. Therefore, this is not a typical or practical application of Polyblend.

Upon examining all options, the most appropriate application of Polyblend is in the construction of roads. The use of Polyblend provides environmental benefits and enhances road quality, making it a sustainable and practical choice.