1113 RAS Prelims practice MCQs on science and technology are on this page, in 6 chapters. They cover the basics of everyday science, computers and information technology, defence and space technology in India, genetics, biotechnology and nanotechnology, science and technology policies and government programmes, and recent advances with Indian contributors and indigenisation. Each question has an answer and an explanation.
Practice questions based on the RPSC RAS Prelims syllabus. They follow the exam pattern but are not past-paper questions.
Showing 571–580 of 1113 questions
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RAS PrelimsScience and Technology · Defence and Space Technology in India
Q571. Consider the following statements: Statement I: GSAT-3, also known as EDUSAT, was India’s first exclusive satellite dedicated to the educational sector. Statement II: EDUSAT was a low earth orbit satellite meant to map university campuses. Which of the above statement(s) is/are correct?
Explanation
This particular satellite was a major milestone as it was the first in the world entirely dedicated to educational services. It allowed for interactive classrooms and distance learning across the country. However, it was placed in a high-altitude orbit to provide wide coverage, not in a low orbit for mapping. Suggestions that it was used for campus imaging are false, as its primary purpose was to deliver high-quality educational content via satellite links to thousands of remote schools and colleges.
RAS PrelimsScience and Technology · Defence and Space Technology in India
Q572. Conceptually, communication satellites like those in the GSAT series act as a relay station in space using:
Explanation
Communication satellites function by receiving signals from the ground, amplifying them, and then sending them back down to a wide area. This is done using specialized electronic devices that operate on different parts of the radio spectrum. Each frequency band is suited for different tasks, such as high-quality television or reliable data networks. This technology allows for the seamless transfer of information across the country, making the satellites an essential part of the modern national telecommunications and broadcasting infrastructure.
RAS PrelimsScience and Technology · Defence and Space Technology in India
Q573. Which of the following services is generally NOT provided by the standard INSAT/GSAT communication satellites?
Explanation
While these satellites provide many vital services like television broadcasting, internet access, and search and rescue support, they are not designed for high-resolution photography. Taking detailed pictures of the ground is the job of specialized Earth observation satellites that usually fly much closer to the planet. The high-altitude communication fleet is focused on relaying radio signals over vast areas, which is a fundamentally different task from using telescopes to capture detailed images of the surface for strategic intelligence or monitoring.
RAS PrelimsScience and Technology · Defence and Space Technology in India
Q574. Identify the correctly matched pair regarding specialized GSAT satellites:
Explanation
The space agency has developed several satellites tailored to the needs of specific users. One of these provides secure and reliable communication links for the naval fleet across the entire Indian Ocean region. Other similar satellites have been launched for the air force or to provide services for neighboring countries. Correctly matching these spacecraft to their primary users highlights how space technology is used to meet the specific strategic and developmental requirements of different branches of the military and the government.
RAS PrelimsScience and Technology · Defence and Space Technology in India
Q575. By definition, a High Throughput Satellite (HTS) in the GSAT fleet provides significantly more data capacity than traditional satellites by using:
Explanation
This advanced type of satellite provides much more data capacity than older models by using a specialized design. Instead of one wide signal covering everything, it uses many smaller, focused beams. This allows the same radio frequencies to be used several times in different areas, significantly increasing the total amount of information the satellite can handle. This technology is essential for providing high-speed internet and other data-heavy services to a large number of users across the country simultaneously.
RAS PrelimsScience and Technology · Defence and Space Technology in India
Q576. The most appropriate benefit of deploying GSAT networks for India’s rural health sector is:
Explanation
One of the most important uses of satellite technology is connecting remote areas with high-quality medical expertise. By providing reliable data links, these satellites allow doctors in rural clinics to consult with specialists in large cities. This helps in diagnosing and treating patients who might otherwise not have access to advanced care. This practical application of space science has a direct and positive impact on the health and well-being of people living in the most distant parts of the country.
RAS PrelimsScience and Technology · Defence and Space Technology in India
Q577. Consider the following statements regarding NavIC: I. It is India’s independent regional navigation satellite system. II. Its operational name is Navigation with Indian Constellation. III. The constellation currently consists of 24 satellites. IV. It provides coverage over the Indian landmass and extending up to 1500 km around it. Which of the above statement(s) is/are correct?
Explanation
This system is a locally developed navigation service that provides accurate positioning and timing information. It is designed to cover the entire country and a large area around its borders. While it provides essential data for both civilian and strategic users, the current group of satellites is much smaller than the dozens used by global systems. Statements about its name, purpose, and coverage area are correct, but the claim that it already has twenty-four satellites is not accurate.
RAS PrelimsScience and Technology · Defence and Space Technology in India
Q578. NavIC provides two types of services. These are:
Explanation
The navigation system provides two distinct levels of data. One is open to everyone and can be used by common devices like smartphones for everyday travel. The other is a highly secure and more accurate signal that is meant only for authorized government and military users. This dual-service approach ensures that the general public benefits from the technology while also providing the specialized and protected data needed for national security and other critical strategic and scientific applications.
RAS PrelimsScience and Technology · Defence and Space Technology in India
Q579. The space segment of the IRNSS (NavIC) originally consists of a constellation of how many satellites?
Explanation
The original design for the regional navigation system required a specific number of satellites to provide full and reliable coverage. This small group of seven spacecraft was placed in carefully chosen orbits to ensure they are always visible from any part of the country. This efficient configuration provides high accuracy for the intended area without the need for the dozens of satellites required by systems that aim for global coverage. It represents a major accomplishment in indigenous satellite network design and operation.
RAS PrelimsScience and Technology · Defence and Space Technology in India
Q580. Consider the following statements: Statement I: The NavIC constellation utilizes satellites placed in both Geostationary and Geosynchronous orbits. Statement II: NavIC relies on atomic clocks imported from Russia. Which of the above statement(s) is/are correct?
Explanation
The navigation system uses a mix of high-altitude orbits to keep the satellites in view of the region at all times. This includes some that stay in one spot and others that move in a figure-eight pattern. While some early components were imported, the long-term goal has been to develop these critical parts indigenously. Suggestions that the system relies entirely on foreign-made clocks are incorrect, as successful efforts have been made to produce and use locally built atomic clocks for the satellites.
Answer key for these questions
Q
Correct answer
571
(a) Statement I is correct but Statement II is incorrect.
572
(b) Transponders in C, Ku, and Ka bands.
573
(b) High-resolution optical spy imagery.
574
(a) GSAT-7 (Rukmini) : Dedicated communication for the Indian Navy
575
(c) Multiple spot beams for frequency reuse.
576
(d) Enabling Tele-medicine and expert consultation via VSAT.
577
(b) I, II, and IV only
578
(a) Standard Positioning Service (SPS) and Restricted Service (RS)
579
(b) 7
580
(a) Statement I is correct but Statement II is incorrect.
Key facts from Science and Technology
The RPSC paper is General Knowledge and General Science, so science questions come with a strong dose of applied and recent topics.
Everyday science questions test the laws and terms of physics, chemistry and biology through examples.
Defence and space questions pair a missile, satellite or mission with its year and organisation.
Policy questions ask for the year, the body and the aim of schemes like STIP, the National Quantum Mission and BioE3.
Health, environment and agriculture are on a separate page, with their own chapters.
Frequently asked questions
How many RAS Prelims practice MCQs are there on Science and Technology?
This page has 1113 practice MCQs on Science and Technology. Each has the correct answer, and most have an explanation.
Which chapters does the science and technology set cover?
Six chapters: basics of everyday science; computers, information and communication technology; defence and space technology in India; genetics, biotechnology and nanotechnology; science and technology policies and government programmes; and recent advances, Indian contributors and indigenisation.
Is science and technology part of the RAS Prelims syllabus?
Yes. The RPSC paper is called General Knowledge and General Science, and its syllabus lists science and technology topics along with environment, health, agriculture and government programmes, so questions can come from any of these areas.
How should I prepare science for RAS Prelims?
Revise the concepts by examples, then learn the missions, schemes and scientists with their year and organisation. Attempt each chapter, read the explanations and keep a list of the facts you missed.
