Q1991. Conceptually, communication satellites like those in the GSAT series act as a relay station in space using:
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Q1992. 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.
Q1993. 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.
Q1994. 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.
Q1995. 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.
Q1996. 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?
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.
Q1997. 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.
Q1998. 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.
Q1999. 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?
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.
Q2000. Conceptually, NavIC satellites broadcast signals in which frequency bands to provide position data?
Explanation
To provide accurate position information, the satellites broadcast their signals on two specific parts of the radio spectrum. Using two different bands helps in correcting errors caused by the atmosphere, leading to better accuracy. This choice of frequencies also ensures that the system can work well with modern receivers found in smartphones and other mobile devices. It is a standard technical feature that allows the navigation service to provide reliable data for both civilian and strategic users across the entire region.Answer key for these questions
| Q | Correct answer |
|---|---|
| 1991 | (b) Transponders in C, Ku, and Ka bands. |
| 1992 | (b) High-resolution optical spy imagery. |
| 1993 | (a) GSAT-7 (Rukmini) : Dedicated communication for the Indian Navy |
| 1994 | (c) Multiple spot beams for frequency reuse. |
| 1995 | (d) Enabling Tele-medicine and expert consultation via VSAT. |
| 1996 | (b) I, II, and IV only |
| 1997 | (a) Standard Positioning Service (SPS) and Restricted Service (RS) |
| 1998 | (b) 7 |
| 1999 | (a) Statement I is correct but Statement II is incorrect. |
| 2000 | (a) L5 and S bands |
Frequently asked questions
How many RAS Prelims practice MCQs are there on RAS Prelims?
This page has 9654 practice MCQs on the RAS Prelims syllabus. Each has the correct answer, and most have an explanation.
How should I practise MCQs for RAS Prelims?
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.
Are these actual RAS Prelims past-paper questions?
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.