Science and Technology: Notes और MCQ Practice

आसान भाषा में:

RRB NTPC में Science and Technology से direct questions पूछे जाते हैं, जो mainly Space missions, Defense tech, Nuclear energy और Basic Computers के around revolve करते हैं। इसमें ISRO के launch vehicles, DRDO की missiles और National scientific achievements सबसे high-scoring topics हैं। बस static facts और current tech developments का सही link बनाना है।

Important Facts & Rules:

• Launch Vehicles (ISRO):
• PSLV: Workhorse of ISRO (4-stage: Solid-Liquid-Solid-Liquid).
• LVM3 / GSLV Mk-III: Heavy-lift launcher (used in Chandrayaan-2, Chandrayaan-3).
• Missile Classification:
• Ballistic Missile (e.g., Agni, Prithvi): Parabolic trajectory, guided only in initial phase.
• Cruise Missile (e.g., BrahMos): Jet-propelled, stays within atmosphere, precision guidance.
• Nuclear Energy: India का first research reactor Apsara (1956) था। Reactors में Moderator के रूप में Heavy Water (D₂O) या Graphite use होता है।
• Computer Basics: 1 Byte = 8 Bits, 1 Nibble = 4 Bits. India's fastest AI supercomputer = AIRAWAT.

2 Quick Tricks:

1. IGMDP Missiles के लिए 'PATNA' याद रखें:

• P - Prithvi (Surface-to-Surface)
• A - Agni (Surface-to-Surface)
• T - Trishul (Surface-to-Air)
• N - Nag (Anti-Tank Guided Missile)
• A - Akash (Surface-to-Air)

1. Orbit Heights Shortcut: LEO (Low Earth Orbit) < 2000 km, जबकि GEO (Geostationary Orbit) = लगभग 36,000 km (Time period = 24 hours, Earth के साथ sync).

2 Common Mistakes:

• Nuclear Fission vs Fusion: Exam में confuse न हों—Nuclear Power Plants और Atom Bomb में Nuclear Fission (Heavy nucleus splits) होता है, जबकि Sun की energy और Hydrogen Bomb में Nuclear Fusion होता है।
• BrahMos Missile Type: कई students इसे Ballistic mark कर देते हैं, याद रखें BrahMos एक Supersonic Cruise Missile है (Indo-Russian joint venture)।

Science and Technology for RRB NTPC

1. Concept

In the RRB NTPC General Awareness section, Science and Technology focuses on contemporary Indian developments and foundational milestones in space exploration, defence technology, nuclear research, information technology, and biotechnology.

Rather than deep theoretical engineering, questions test your awareness of:

• Space Science: The Indian Space Research Organisation (ISRO), satellites, launch vehicles, and interplanetary missions.
• Defence Technology: The Defence Research and Development Organisation (DRDO), missile systems, fighter aircraft, submarines, and radars.
• Nuclear Energy: Atomic power stations in India, research reactors, and regulatory bodies.
• Computing & IT: Supercomputers in India, artificial intelligence initiatives, and basic digital terms.

2. Important Facts, Organisations, and Milestones

Space Research (ISRO)

• Foundation: Formed on August 15, 1969. Headquarters: Bengaluru, Karnataka.
• Key Spaceports:
• Satish Dhawan Space Centre (SDSC / SHAR) at Sriharikota, Andhra Pradesh (primary satellite launching station).
• Thumba Equatorial Rocket Launching Station (TERLS) at Thiruvananthapuram, Kerala (sounding rockets).
• First Satellite: Aryabhata (launched on April 19, 1975, using a Soviet Kosmos-3M launch vehicle).
• Launch Vehicles:
• PSLV (Polar Satellite Launch Vehicle): Known as the "Workhorse of ISRO"; 4-stage engine (Solid-Liquid-Solid-Liquid).
• GSLV (Geosynchronous Satellite Launch Vehicle): Uses cryogenic fuel in its 3rd stage.
• LVM3 (Launch Vehicle Mark-3): Heaviest operational rocket of ISRO (used for Chandrayaan-2, Chandrayaan-3, and OneWeb launches).
• Prominent Missions:
• Chandrayaan-1 (2008): Confirmed water molecules on the Moon (launched by PSLV-C11).
• Mars Orbiter Mission / MOM (2013): Launched by PSLV-C25; India was first nation to reach Martian orbit in its maiden attempt.
• Chandrayaan-3 (2023): Landed near the lunar south pole (Lander: Vikram; Rover: Pragyan).
• Aditya-L1 (2023): India's first solar observatory mission, placed around Lagrange Point 1 (L1).

Defence Technology (DRDO)

• Foundation: Established in 1958 under the Ministry of Defence. Headquarters: New Delhi.
• Integrated Guided Missile Development Programme (IGMDP): Conceived by Dr. A.P.J. Abdul Kalam (started 1983, completed 2008). Developed 5 core missile systems:
• Prithvi: Surface-to-Surface, short-range ballistic missile.
• Agni: Surface-to-Surface, medium-to-intercontinental ballistic missile.
• Trishul: Surface-to-Air, short-range missile.
• Nag: Third-generation "fire-and-forget" anti-tank guided missile (air-launched version: Helina/Dhruvastra).
• Akash: Surface-to-Air, medium-range missile.
• BrahMos: Supersonic cruise missile jointly developed by India (DRDO) and Russia (NPOM), named after the Brahmaputra and Moskva rivers.
• Missile Defence & Radars: K-15 Sagarika (submarine-launched), Astra (Beyond Visual Range Air-to-Air), Swathi (weapon locating radar).

Nuclear Science

• Pioneers & Bodies: Dr. Homi Jehangir Bhabha is the Father of the Indian Nuclear Programme. Department of Atomic Energy (DAE) set up in 1954; Bhabha Atomic Research Centre (BARC) at Trombay, Mumbai.
• First Research Reactor: Apsara (1956, Asia's first research reactor).
• Nuclear Tests:
• Pokhran-I (1974): Code-named "Smiling Buddha".
• Pokhran-II (1998): Code-named "Operation Shakti".
• Major Nuclear Power Plants in India:
• Tarapur: Maharashtra (India's first commercial nuclear power plant, 1969)
• Rawatbhata: Rajasthan
• Kudankulam & Kalpakkam (MAPS): Tamil Nadu
• Kaiga: Karnataka
• Kakrapar: Gujarat
• Narora: Uttar Pradesh

Supercomputing & IT

• First Indigenous Supercomputer: PARAM 8000, built by C-DAC (Centre for Development of Advanced Computing) in 1991 under Dr. Vijay Bhatkar.
• National Supercomputing Mission (NSM): Deployed indigenous systems like PARAM Shivay, PARAM Shakti, PARAM Pravega, and AIRAWAT (AI supercomputer at C-DAC Pune).

3. Exam-Style Solved Examples

Example 1

Question: Which rocket launched India's Chandrayaan-3 mission from Sriharikota?

• (A) PSLV-C56
• (B) LVM3-M4
• (C) GSLV-F10
• (D) SSLV-D2

Solution:

• Step 1: Recall the mass and vehicle class of Chandrayaan-3. The composite module weighed nearly 3,900 kg, which requires ISRO's heaviest launch vehicle.
• Step 2: The launch vehicle was LVM3 (Launch Vehicle Mark-3), specifically flight number M4.
• Correct Answer: (B) LVM3-M4

Example 2

Question: The missile 'Nag' developed under India's IGMDP falls under which category?

• (A) Surface-to-Air missile
• (B) Anti-tank guided missile
• (C) Air-to-Air missile
• (D) Submarine-launched ballistic missile

Solution:

• Step 1: Break down the acronym PATNA under IGMDP: Prithvi (Surface-to-Surface), Agni (Surface-to-Surface), Trishul (Surface-to-Air), Nag (Anti-tank), Akash (Surface-to-Air).
• Step 2: 'Nag' is a fire-and-forget anti-tank guided missile with thermal imaging guidance.
• Correct Answer: (B) Anti-tank guided missile

Example 3

Question: Match the nuclear power plant with its corresponding state:

1. Kakrapar — A. Karnataka
2. Kaiga — B. Gujarat
3. Narora — C. Uttar Pradesh

• (A) 1-A, 2-B, 3-C
• (B) 1-B, 2-A, 3-C
• (C) 1-C, 2-A, 3-B
• (D) 1-B, 2-C, 3-A

Solution:

• Step 1: Kakrapar is located near Surat in Gujarat (1 -> B).
• Step 2: Kaiga is located on the Kali river in Karnataka (2 -> A).
• Step 3: Narora is situated in Bulandshahr district, Uttar Pradesh (3 -> C).
• Correct Answer: (B) 1-B, 2-A, 3-C

Example 4

Question: What is the primary purpose of the 'BrahMos' missile?

• (A) Intercontinental ballistic weapon
• (B) Supersonic cruise missile
• (C) Anti-satellite interception system
• (D) Low-orbit communication satellite

Solution:

• Step 1: Analyze the missile class. BrahMos operates with a ramjet engine, maintaining supersonic speed (around Mach 2.8 to 3.0) throughout its flight trajectory inside the atmosphere.
• Step 2: A missile that flies aerodynamically within the atmosphere at constant speed is a cruise missile, not a ballistic missile.
• Correct Answer: (B) Supersonic cruise missile

4. Shortcuts and Memory Tricks

1. The IGMDP Missiles: "PATNA"

• P = Prithvi (Surface-to-Surface)
• A = Agni (Surface-to-Surface)
• T = Trishul (Surface-to-Air)
• N = Nag (Anti-tank)
• A = Akash (Surface-to-Air)

1. Remembering Nuclear Plant Locations:

• K-K-K Rule:
• Kaiga = Karnataka
• Kakrapar = Kalue (vegetable) / Gujarat (rhymes with Kakra snacks in Gujarat)
• Kudankulam / Kalpakkam = Tamil Nadu (both end in southern Dravidian names)
• Narora = Northern India (Uttar Pradesh)
• Tarapur = Maharashtra (near Mumbai / *T*ara of Bollywood)

1. PSLV Stages (4 Stages): "S-L-S-L"

• Stage 1: Solid (HTPB propellant)
• Stage 2: Liquid (Vikas engine, UDMH + N2O4)
• Stage 3: Solid
• Stage 4: Liquid

5. Common Mistakes to Avoid

• Launching Station vs. Missile Testing Range:
• Satellites are primarily launched from Sriharikota (Andhra Pradesh).
• Missiles (DRDO) are primarily tested from Integrated Test Range (ITR), Chandipur / Dr. APJ Abdul Kalam Island (Odisha). Do not mix these up in the exam.
• Ballistic vs. Cruise Missile:
• Ballistic missiles (e.g., Agni, Prithvi) follow an arcing, projectile-like path leaving and re-entering the atmosphere.
• Cruise missiles (e.g., BrahMos, Nirbhay) fly within the atmosphere, self-powered at low altitudes to evade radar.
• Aryabhata Launch Vehicle:
• Do not select an Indian rocket (like SLV-3 or PSLV) for Aryabhata. India had not yet developed a successful satellite launch vehicle in 1975; it was launched by the Soviet Union. India's first successful indigenous rocket launch was SLV-3 in 1980 (carrying the Rohini satellite).
• Lander vs. Rover Names:
• For both Chandrayaan-2 and Chandrayaan-3, the Lander is Vikram (named after Dr. Vikram Sarabhai), and the Rover is Pragyan (meaning wisdom). Do not swap them.