1. With reference to 2D materials, consider the following statements:

1. They are materials that are only one atom thick but exhibit unique electrical, thermal, and mechanical properties.
2. Graphene, the first 2D material isolated, led to the Nobel Prize in Physics in 2010.
3. Transition Metal Dichalcogenides (TMDCs) like MoS? and WS? have direct band gaps, unlike bulk silicon.

Which of the statements given above are correct?

• 1 and 2 only
• 2 and 3 only
• 1 and 3 only
• 1, 2 and 3

2. Which of the following tribes are classified as PVTGs?

1. Sentinelese
2. Baiga
3. Todas
4. Bhils

Select the correct answer using the code given below:

• 1 and 2 only
• 2 and 3 only
• 1, 2 and 3 only
• 1, 2, 3 and 4

3. The Environment Audit Rules, 2025 provide for which of the following functions of environment auditors?

1. Sampling and analysing emissions and effluents.
2. Computing environmental compensation for violations.
3. Verification under the Green Credit Rules, E-Waste Rules, and Plastic Waste Rules.
4. Issuing environmental clearance certificates for new projects.

Select the correct answer using the code given below:

• 1, 2 and 3 only
• 2, 3 and 4 only
• 1, 3 and 4 only
• 1, 2, 3 and 4

4. According to the Sample Registration System (SRS) Statistical Report 2023, which of the following trends were observed?

1. Total Fertility Rate (TFR) fell below the replacement level.
2. Infant Mortality Rate (IMR) declined to a historic low.
3. Sex Ratio at Birth improved to near parity.

Select he correct answer using the code given below:

• 1 and 2 only
• 2 and 3 only
• 1 and 3 only
• 1, 2 and 3

5. With reference to the Health AI Global Regulatory Network (GRN), consider the following:

1. It is a Geneva-based non-profit consortium of health regulators.
2. It maintains a global directory of registered AI health tools to support transparency.
3. India’s participation is led by ICMR–NIRDHDS and IndiaAI.

Which of the statements given above are correct?

• 1 and 2 only
• 2 and 3 only
• 1 and 3 only
• 1, 2 and 3