Environmental Applications — Prelims Questions

Which of the following statements about the environmental applications of nanotechnology is/are correct? 1. Carbon nanotubes are primarily used for their photocatalytic properties in water purification. 2. Nano-scale Zero-Valent Iron (nZVI) is effective in degrading chlorinated organic compounds in soil. 3. Graphene-based nanosensors offer high sensitivity for detecting pollutants at very low concentrations. Select the correct answer using the code given below:

Consider the following applications of nanomaterials: 1. Enhancing efficiency of solar cells. 2. Degradation of airborne VOCs using photocatalysis. 3. In-situ immobilization of heavy metals in soil. 4. Real-time detection of trace pollutants in water. Which of the above are considered 'environmental applications' of nanotechnology?

With reference to the regulatory framework for nanotechnology in India, consider the following statements: 1. The Environment (Protection) Act, 1986, explicitly mentions 'nanomaterials' for regulation. 2. The National Green Tribunal (NGT) has no jurisdiction over cases involving environmental impacts of nanotechnology. 3. The Bureau of Indian Standards (BIS) is involved in developing guidelines for nanomaterials. Which of the statements given above is/are correct?

Which of the following nanomaterials is primarily known for its broad-spectrum antimicrobial properties in water treatment, but also raises concerns about potential ecotoxicity?

Consider the following statements regarding the 'Green Nanotechnology' approach: 1. It focuses on developing nanomaterials that are environmentally benign throughout their lifecycle. 2. It prioritizes maximizing the energy consumption during nanomaterial synthesis to ensure high purity. 3. It encourages the use of hazardous chemicals in synthesis if they lead to superior product performance. Which of the statements given above is/are correct?