Q591. Identify the correctly matched pair of the Aditya-L1 payload and its specific target of study:
Science and Technology: RAS Prelims MCQs
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 591–600 of 1113 questions
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Q592. Which of the following layers of the Sun is inherently impossible to be directly studied via remote sensing instruments on Aditya-L1?
Explanation
While the observatory can use advanced cameras and sensors to study the different outer layers of the sun, it cannot see into the very center. The middle of the sun is hidden behind thousands of kilometers of dense material, making it impossible to observe directly with light or other signals. Scientists study the core using other methods like computer models or specialized particle detectors on Earth. The mission is focused on the parts of the sun that can be seen from space.
Q593. By definition, a Lagrange point in space is a position where:
Explanation
These are unique spots in space between two large objects, like the sun and the Earth, where a smaller object can stay in a fixed position. At these points, the pull of gravity from both large bodies perfectly balances the force of the small object’s motion. This creates a stable location that is perfect for placing satellites or observatories that need to stay in one place relative to the planets or the sun, allowing for long-term and continuous observation.
Q594. What is a key practical effect of Coronal Mass Ejections (CMEs) and solar flares that Aditya-L1 seeks to monitor for Earth’s benefit?
Explanation
Massive explosions of energy from the sun can send powerful clouds of particles toward our planet. When these clouds arrive, they can interfere with the electronics on satellites and even cause problems for power lines on the ground. By monitoring these events, the solar observatory helps provide warnings so that companies can protect their equipment. This is a very practical benefit of the mission, as it helps to keep our global communication and energy systems safe from the sun’s activity.
Q595. What is the most appropriate overall significance of the Aditya-L1 mission for India’s space programme?
Explanation
The successful launch and operation of this mission represent a major milestone, as it is the country’s first dedicated space observatory for the sun. It places the nation in a small group of spacefaring powers with the ability to conduct long-term solar research from deep space. The data collected will improve our understanding of the sun and help protect our technology from solar storms. This mission is a clear sign of the growing maturity and ambition of the national space program.
Q596. Which of the following nitrogenous bases is a purine found in the DNA double helix?
Explanation
Purines are nitrogenous bases containing a double-ring structure consisting of a six-membered ring fused to a five-membered ring. In the DNA double helix, the two primary purines are adenine and guanine. Adenine pairs specifically with the pyrimidine thymine through hydrogen bonding, ensuring the structural stability and consistent diameter of the genetic material across various biological organisms.
Q597. In the Watson-Crick model of DNA, how many hydrogen bonds pair Adenine with Thymine?
Explanation
The Watson-Crick model describes the specific base-pairing rules that stabilize the double helix structure. In this molecular arrangement, adenine forms exactly two hydrogen bonds with thymine to ensure complementary pairing. This specific interaction maintains the uniform width of the DNA molecule while allowing for the efficient storage and replication of genetic information during cellular division processes.
Q598. What is the fundamental structural unit of a DNA molecule?
Explanation
A nucleotide serves as the primary structural building block of the deoxyribonucleic acid molecule. Each individual unit consists of three distinct components: a pentose sugar called deoxyribose, a phosphate group, and one of four nitrogenous bases. These units link together via phosphodiester bonds to form long polynucleotide chains, which encode the genetic instructions necessary for life.
Q599. Consider the following statements regarding the DNA double helix:
I. The two strands run in an antiparallel direction.
II. The backbone is constituted by sugar-phosphate.
III. The pitch of the helix is 3.4 nanometers.
Which of the above statements are correct?
I. The two strands run in an antiparallel direction.
II. The backbone is constituted by sugar-phosphate.
III. The pitch of the helix is 3.4 nanometers.
Which of the above statements are correct?
Explanation
The B-form DNA double helix exhibits several defining structural characteristics essential for its biological function. The two strands run in opposite directions, known as an antiparallel orientation. The external backbone is composed of repeating deoxyribose sugar and phosphate units. Furthermore, the helix completes one full turn every 3.4 nanometers, accommodating approximately ten base pairs per turn.
Q600. Given below are two statements, one labeled as
Assertion (A) and the other as Reason (R):
Assertion (A): The two strands of DNA can be separated by heating.
Reason (R): The strands of DNA are held together by weak hydrogen bonds between the nitrogenous bases.
Select the correct answer from the codes given below:
Assertion (A) and the other as Reason (R):
Assertion (A): The two strands of DNA can be separated by heating.
Reason (R): The strands of DNA are held together by weak hydrogen bonds between the nitrogenous bases.
Select the correct answer from the codes given below:
Explanation
Heating DNA provides thermal energy that disrupts the weak hydrogen bonds holding the two complementary strands together. Because these bonds are non-covalent, they break more easily than the covalent phosphodiester backbone when exposed to high temperatures. This separation process, known as denaturation, is fundamental for molecular techniques like polymerase chain reactions and occurs naturally during DNA replication.Answer key for these questions
| Q | Correct answer |
|---|---|
| 591 | (d) VELC : Studying the solar corona and CMEs. |
| 592 | (d) Solar Core |
| 593 | (b) Two-body gravity balances centrifugal force. |
| 594 | (d) Solar weather disrupting satellites and grids. |
| 595 | (a) Operational deep space solar observatories. |
| 596 | (b) Adenine |
| 597 | (b) Two |
| 598 | (c) Nucleotide |
| 599 | (d) I, II and III |
| 600 | (a) Both A and R are true and R is the correct explanation of A. |
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.