Modern Scientists — Set 1

Correct Answer: C. A.P.J. Abdul Kalam

• **A.P.J. Abdul Kalam** = is widely known as the 'Missile Man of India' for his pivotal role in developing ballistic missile and nuclear weapons programs. • **2002 to 2007** — He served as the 11th President of India during this period. • 💡 Wrong-option analysis: [Vikram Sarabhai]: known as the Father of the Indian Space Program; [Satish Dhawan]: former Chairman of ISRO, known for space program leadership; [Homi J. Bhabha]: known as the Father of the Indian Nuclear Program.

Correct Answer: C. Homi J. Bhabha

• **Homi J. Bhabha** = is widely regarded as the 'Father of the Indian Nuclear Program' for his foundational work in establishing India's nuclear capabilities. • **three-stage** — He formulated the `three-stage` nuclear power programme, a long-term plan to utilize India's vast thorium reserves. • 💡 Wrong-option analysis: [M.G.K. Menon]: an Indian physicist and policymaker, involved in cosmic ray physics and science administration; [C.N.R. Rao]: a chemist known for his work in solid-state and materials chemistry; [Raja Ramanna]: a prominent Indian physicist who played a key role in India's nuclear weapons program after Bhabha.

Correct Answer: A. Vikram Sarabhai

• **Vikram Sarabhai** = founded the Indian Space Research Organization (ISRO) and is recognized as the 'Father of the Indian Space Program'. • **1969** — He established ISRO in `1969`, laying the foundation for India's indigenous space capabilities. • 💡 Wrong-option analysis: [U.R. Rao]: a renowned space scientist who served as Chairman of ISRO and initiated the INSAT series; [K. Kasturirangan]: a former Chairman of ISRO, known for his leadership in satellite development; [Satish Dhawan]: a former Chairman of ISRO, instrumental in the development of India's satellite launch vehicles.

Correct Answer: A. The Raman Effect

• **Raman Effect** = describes the change in the wavelength of light that occurs when a light beam is deflected by molecules. • **1930** — C.V. Raman was awarded the Nobel Prize in Physics in `1930` for this groundbreaking discovery. • 💡 Wrong-option analysis: [Thermal Ionization]: a process related to ionization in gases at high temperatures, not Raman's discovery; [Superconductivity]: a phenomenon where materials conduct electricity with zero resistance, discovered by Heike Kamerlingh Onnes; [Cosmic Radiation]: high-energy particles originating from outside the Solar System, studied by various physicists like Victor Hess.

Correct Answer: D. Meghnad Saha

• **Meghnad Saha** = developed the 'Saha Ionization Equation,' which is fundamental to astrophysics for understanding the physical and chemical conditions in stars. • **1920** — He published his ionization equation in `1920`, revolutionizing the field of stellar spectroscopy. • 💡 Wrong-option analysis: [Jayant Narlikar]: an astrophysicist known for his work in cosmology, particularly the steady-state theory; [Subrahmanyan Chandrasekhar]: a Nobel laureate known for his work on the structure and evolution of stars, specifically the Chandrasekhar Limit; [S.N. Bose]: a physicist known for his work on quantum mechanics and the Bose-Einstein statistics.

Correct Answer: D. Bose-Einstein Statistics

• **Bose-Einstein Statistics** = describes the statistical mechanics of identical particles with integer spin, now called bosons, and was developed by S.N. Bose and Albert Einstein. • **1924** — Bose sent his paper on quantum statistics to Einstein in `1924`, which Einstein translated and published. • 💡 Wrong-option analysis: [Photoelectric Effect]: explained by Albert Einstein, but not his collaboration with Bose; [General Relativity]: developed by Albert Einstein independently of Bose; [Quantum Entanglement]: a quantum mechanical phenomenon, initially described by Einstein, Podolsky, and Rosen, but not a collaboration with Bose.

Correct Answer: C. Hargobind Khorana

• **Hargobind Khorana** = was an Indian-American biochemist who received the Nobel Prize in Physiology or Medicine for his groundbreaking work on genetic code interpretation. • **1968** — He shared the Nobel Prize in `1968` with Marshall W. Nirenberg and Robert W. Holley. • 💡 Wrong-option analysis: [Amartya Sen]: an economist who won the Nobel Memorial Prize in Economic Sciences; [Subrahmanyan Chandrasekhar]: a physicist who won the Nobel Prize in Physics for his work on stellar evolution; [Venkatraman Ramakrishnan]: a chemist who won the Nobel Prize in Chemistry for his studies on the ribosome (in 2009).

Correct Answer: A. M.S. Swaminathan

• **M.S. Swaminathan** = is globally recognized as the 'Father of the Green Revolution in India' for his leadership in introducing and developing high-yielding crop varieties. • **1960s** — His pioneering work in the `1960s` transformed India from a food-deficient nation to a self-sufficient one. • 💡 Wrong-option analysis: [Salim Ali]: an ornithologist, known as the 'Birdman of India'; [Verghese Kurien]: known as the 'Father of the White Revolution' for his work in dairy development; [Birbal Sahni]: a paleobotanist, known for his studies on plant fossils.

Correct Answer: D. The evolution of stars

• **stellar evolution** = Subrahmanyan Chandrasekhar won the Nobel Prize for his theoretical studies on the physical processes important to the structure and evolution of stars. • **1983** — He shared the Nobel Prize in Physics in `1983` with William A. Fowler for their independent theoretical studies. • 💡 Wrong-option analysis: [Solid state physics]: a branch of physics that deals with the properties of solid materials, not Chandrasekhar's primary work; [Black holes]: while his work contributed to understanding their formation, his prize was for the broader concept of stellar evolution and the Chandrasekhar Limit; [Quantum mechanics]: a fundamental theory in physics that describes the behavior of matter and energy at the atomic and subatomic level, not his prize-winning work.

Correct Answer: D. Verghese Kurien

• **Verghese Kurien** = is widely known as the 'Father of the White Revolution' in India for his pivotal role in transforming the country's dairy industry. • **1970** — He launched 'Operation Flood', the world's largest dairy development program, in `1970`. • 💡 Wrong-option analysis: [M.S. Swaminathan]: known as the 'Father of the Green Revolution' for his work in crop improvement; [Tribhuvandas Patel]: instrumental in forming the Kaira District Co-operative Milk Producers' Union, which later became Amul; [H.M. Dalaya]: a dairy engineer and pioneer of modern dairy technology in India, who worked closely with Kurien.