Q541. Environmental Impact Assessment (EIA) is systematically defined as:
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Q542. Which scientist proposed the planetary model of the atom, where electrons revolve in discrete circular orbits around the nucleus?
Explanation
Niels Bohr proposed a revolutionary atomic model in 1913, often described as the planetary model. He suggested that electrons revolve around the nucleus in specific, discrete circular orbits with fixed energy levels. In this model, electrons can only exist in these allowed orbits and can jump between them by absorbing or emitting energy, explaining the unique spectral lines observed in hydrogen atoms.
Q543. The town planning of the Mature Harappan phase at Kalibangan is characterized by:
Explanation
Kalibangan in the Mature Harappan phase was planned on a grid, with streets running roughly north-south and east-west. This is the classic Harappan town plan.
Q544. Which of the following options represents the correct sequence of countries and religions as specified for exemption under the Citizenship Amendment Act (CAA), 2019?
Explanation
The CAA 2019 specifically identifies three neighboring countries: Pakistan, Bangladesh, and Afghanistan. It provides benefits to illegal migrants belonging to six religious minority communities from these countries: Hindus, Sikhs, Buddhists, Jains, Parsis, and Christians. The Act excludes other neighboring countries like Sri Lanka or Myanmar and does not include the majority religious community of the three specified countries.
Q545. During the Environmental Impact Assessment (EIA) process in India, the purpose of the "Public Hearing" phase is primarily to:
Explanation
The public hearing is a crucial step in the EIA process in India. It provides a formal platform for local residents and stakeholders to express their concerns regarding the proposed project’s impact on their environment and livelihoods. This participatory approach ensures transparency and allows the government to incorporate local knowledge and community feedback into the final environmental clearance decision, balancing industrial needs with community welfare.
Q546. Ernest Rutherford’s gold foil experiment led to the discovery of the:
Explanation
Ernest Rutherford’s famous gold foil experiment involved firing alpha particles at a thin sheet of gold. While most particles passed through, some were deflected at large angles. This unexpected result led to the conclusion that atoms are mostly empty space, with their positive charge and most of their mass concentrated in a tiny, dense central region which Rutherford named the atomic nucleus.
Q547. A distinguishing religious or ritualistic feature found at Kalibangan, often absent in many other major Harappan sites, is the presence of:
Explanation
A unique ritualistic feature of Kalibangan is the presence of several fire altars, or Havan Kunds. These were discovered both in the citadel and in individual houses in the lower town. Built on prominent mud-brick platforms, these altars often contained ash, charcoal, and animal bones. This suggests that the people of Kalibangan practiced distinct religious rituals involving fire and ritualistic offerings.
Q548. Consider the following geographical areas in India:
I. Tribal areas of Assam, Meghalaya, Mizoram or Tripura included in the Sixth Schedule.
II. Areas notified under the Inner Line Permit (ILP) regime under the Bengal Eastern Frontier Regulation, 1873.
III. Coastal districts of Gujarat and Maharashtra.
Which of the above combination of areas are explicitly exempted from the provisions of the Citizenship Amendment Act (CAA), 2019?
I. Tribal areas of Assam, Meghalaya, Mizoram or Tripura included in the Sixth Schedule.
II. Areas notified under the Inner Line Permit (ILP) regime under the Bengal Eastern Frontier Regulation, 1873.
III. Coastal districts of Gujarat and Maharashtra.
Which of the above combination of areas are explicitly exempted from the provisions of the Citizenship Amendment Act (CAA), 2019?
Explanation
The provisions of the Citizenship Amendment Act, 2019, do not apply to the tribal areas of Assam, Meghalaya, Mizoram, and Tripura which are included in the Sixth Schedule of the Constitution. Additionally, the Act exempts areas that are notified under the ‘Inner Line Permit’ regime. This was done to protect the unique cultural and social identity of the indigenous populations.
Q549. In the EIA process, the step that determines the extent and specific issues to be addressed in the assessment study, setting the Terms of Reference (ToR), is known as:
Explanation
Scoping is the stage in the EIA process where the specific boundaries and key issues of the study are defined. During this phase, the Terms of Reference are set, which guide the investigators on what impacts to prioritize and what data to collect. Effective scoping ensures that the assessment focuses on the most significant environmental risks, making the study more efficient and relevant for the decision-making process.
Q550. Arrange the following atomic models in chronological order of their proposal:
I. Bohr’s model
II. Dalton’s solid sphere model
III. Thomson’s plum pudding model
IV. Rutherford’s nuclear model
Which of the following is the correct order?
I. Bohr’s model
II. Dalton’s solid sphere model
III. Thomson’s plum pudding model
IV. Rutherford’s nuclear model
Which of the following is the correct order?
Explanation
The understanding of atomic structure evolved through several key models. John Dalton first proposed the solid sphere model in the early eighteen-hundreds. J.J. Thomson followed with the "plum pudding" model after discovering the electron. Ernest Rutherford then introduced the nuclear model based on his scattering experiments. Finally, Niels Bohr refined this by adding quantized electron orbits, creating the modern planetary model.Answer key for these questions
| Q | Correct answer |
|---|---|
| 541 | (b) Pre-decision impact evaluation. |
| 542 | (b) Niels Bohr |
| 543 | (b) A grid pattern aligning streets roughly north-south and east-west |
| 544 | (b) Pakistan, Bangladesh, Afghanistan; Hindus, Sikhs, Buddhists, Jains, Parsis, Christians |
| 545 | (b) Recording local stakeholder concerns. |
| 546 | (b) Atomic nucleus |
| 547 | (a) Fire altars (Havan Kunds) built on prominent brick platforms |
| 548 | (a) I and II only |
| 549 | (a) Scoping |
| 550 | (a) II, III, IV, I |
Frequently asked questions
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This page has 9654 practice MCQs on the RAS Prelims syllabus. Each has the correct answer, and most have an explanation.
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Attempt each question first, then open the answer and read the explanation. Practise one chapter at a time, note the facts you got wrong and revise them. Repeat the chapter after a few days.
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No. These are practice questions written for the RAS Prelims syllabus. They follow the pattern the exam uses: factual questions, statement-based questions, match-the-list and assertion-reason.