Q961. The Raman Effect demonstrates which specific type of scattering when monochromatic light passes through a transparent medium?
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.
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Q962. National Science Day is celebrated in India on February 28 every year to commemorate which of the following events?
Explanation
National Science Day is celebrated annually on February 28 to honor the announcement of the Raman Effect in 1928. This event serves to highlight the importance of scientific temper and acknowledge the contributions of Indian scientists. Unlike birth anniversaries, this celebration focuses on the specific date when this monumental physical discovery was formally presented to the world.
Q963. Consider the following statements regarding the Raman Effect:
Statement I: The lines in the scattered spectrum with lower frequencies than the incident light are called Stokes lines.
Statement II: The lines with higher frequencies than the incident light are called anti-Stokes lines.
Which of the following is correct?
Statement I: The lines in the scattered spectrum with lower frequencies than the incident light are called Stokes lines.
Statement II: The lines with higher frequencies than the incident light are called anti-Stokes lines.
Which of the following is correct?
Explanation
In the Raman spectrum, the frequency shifts are categorized based on energy exchange. Stokes lines occur when photons lose energy to molecules, resulting in lower scattered frequencies. Conversely, anti-Stokes lines appear when photons gain energy from vibrationally excited molecules, leading to higher scattered frequencies. Both statements accurately define these essential features observed in the inelastic scattering of light.
Q964. Match the following Indian scientists in List I with their key contributions in List II and select the correct answer using the given options.
| Indian Scientist | Key Contribution |
|---|---|
| A. C.V. Raman | i. Ionization equation |
| B. Srinivasa Ramanujan | ii. Cosmic ray cascade theory |
| C. Homi J. Bhabha | iii. Inelastic scattering of light |
| D. Meghnad Saha | iv. Mock theta functions |
Explanation
Indian scientists made diverse contributions across various disciplines. Sir C.V. Raman discovered the inelastic scattering of light, while Srinivasa Ramanujan worked on mock theta functions. Homi J. Bhabha developed the cosmic ray cascade theory, and Meghnad Saha formulated the ionization equation for astrophysics. These mappings accurately reflect the primary research areas and legacy of each prominent scientific figure.
Q965. Which of the following statements about C.V. Raman is incorrect?
Explanation
While C.V. Raman was a pioneering physicist and the first Asian Nobel laureate in science, he did not lead the Indian space program. That role was held by Vikram Sarabhai. Raman’s major leadership roles included establishing the Raman Research Institute and receiving the Bharat Ratna. He focused primarily on light, acoustics, and building domestic scientific research institutions.
Q966. Identify the odd one out among the practical applications of Raman spectroscopy.
Explanation
Raman spectroscopy is utilized to identify molecular fingerprints in various materials. It is highly effective for determining chemical structures in pharmaceuticals, verifying historical artworks, and detecting specific hazardous substances like narcotics or explosives. However, measuring vehicle speed relies on the Doppler effect of radio or light waves, which is a fundamentally different physical principle than inelastic molecular scattering.
Q967. In Raman scattering, what is the primary cause of the change in wavelength of the scattered light?
Explanation
The shift in wavelength during Raman scattering results from the interaction between incident photons and the vibrational or rotational energy levels of molecules. When a photon collides with a molecule, it may transfer energy to it or gain energy from it. This energy exchange alters the photon’s frequency, creating the distinct spectral lines used in chemical analysis.
Q968. Which of the following is an exception to the primary areas of research conducted by C.V. Raman during his career?
Explanation
Throughout his illustrious career, C.V. Raman investigated a wide range of physical phenomena. His research encompassed the acoustics of musical instruments, the physiology of human vision, and the magnetic properties of crystals. While he was deeply interested in the natural world, he did not conduct research in agricultural genetics, which was a field led by other specialized biological scientists.
Q969. Consider the following statements regarding the legacy of C.V. Raman:
I. He founded the Indian Journal of Physics.
II. He discovered the Raman Effect while working at the Indian Association for the Cultivation of Science.
III. He worked extensively on the acoustics of the tabla and mridangam.
Which of the above statement(s) is/are correct?
I. He founded the Indian Journal of Physics.
II. He discovered the Raman Effect while working at the Indian Association for the Cultivation of Science.
III. He worked extensively on the acoustics of the tabla and mridangam.
Which of the above statement(s) is/are correct?
Explanation
Sir C.V. Raman left a profound legacy in Indian science through institutional building and diverse research. He founded the Indian Journal of Physics and discovered the Raman Effect at the Indian Association for the Cultivation of Science. Additionally, his curiosity led him to study the physics of Indian percussion instruments like the tabla and mridangam, demonstrating his interdisciplinary approach.
Q970. The number 1729 is famously known as the Hardy-Ramanujan number. What is the unique mathematical property of this number?
Explanation
The number 1729 is famously linked to a conversation between G.H. Hardy and Srinivasa Ramanujan. It is the smallest positive integer that can be represented as the sum of two cubes in two different ways: one cubed plus twelve cubed, and nine cubed plus ten cubed. This observation highlights Ramanujan’s extraordinary intuition and deep familiarity with integers.Answer key for these questions
| Q | Correct answer |
|---|---|
| 961 | (a) Inelastic scattering where scattered light shifts in frequency |
| 962 | (c) The discovery of the Raman Effect |
| 963 | (a) Both Statement I and Statement II are correct |
| 964 | (c) A-iii, B-iv, C-ii, D-i |
| 965 | (b) He served as the first Chairman of the Indian Space Research Organisation. |
| 966 | (d) Measuring the speed of moving vehicles using Doppler shift |
| 967 | (a) Energy exchange between incident photons and molecular vibrational states |
| 968 | (c) Genetic mutation in agricultural crops |
| 969 | (d) I, II, and III |
| 970 | (d) The smallest number expressible as the sum of two cubes in two ways |
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.