Science and Technology

Why Science & Technology Pays Off in AFCAT

The AFCAT General Awareness paper carries a meaningful share of marks, and Science & Technology is a regular, predictable contributor. Unlike Numerical Ability, these questions are pure recall — one fact, one mark, in five seconds.

For Air Force aspirants there is a bonus: examiners lean heavily on space and defence — ISRO launches, indigenous fighter aircraft, missiles and naval/air systems. Reading these once with intent gives you a strong, low-effort scoring base.

The smart strategy is to treat this topic as a memory bank, not a study project. You do not derive anything or solve sums; you simply recognise a name, a unit or a one-line fact and tick the right option. Because the syllabus repeats the same high-frequency facts year after year, a focused revision sheet beats hours of unfocused reading. The aim of this Cavalier guide is exactly that: give you the dependable, oft-repeated facts in a layout you can revise in a single sitting and again on exam morning.

ISRO and India's Space Programme

The Indian Space Research Organisation (ISRO), headquartered in Bengaluru, drives India's space effort. A few anchor facts get asked repeatedly:

• Chandrayaan-3 — in 2023 India became the first nation to soft-land near the Moon's south pole; the lander was named Vikram and the rover Pragyan.
• Mangalyaan (Mars Orbiter Mission) — 2013–14; India was the first country to reach Mars orbit on its maiden attempt.
• Aditya-L1 — India's first dedicated solar observatory, placed near the Sun–Earth Lagrange point L1.

Know the workhorse launch vehicles too:

• PSLV (Polar Satellite Launch Vehicle) — reliable, used for Earth-observation and many small satellites.
• GSLV / LVM3 — heavier payloads and communication satellites; LVM3 carried Chandrayaan-3.

It also helps to separate the two kinds of objects examiners blur together. A launch vehicle is the rocket that lifts the payload, while a satellite is the payload that stays in orbit and does the work. So PSLV and GSLV are rockets, whereas INSAT and GSAT (communication), Cartosat (mapping and reconnaissance) and the NavIC/IRNSS constellation (regional navigation) are satellites. India's human-spaceflight programme, Gaganyaan, is another frequently asked name — it aims to send Indian astronauts, called Gaganauts, to space aboard an Indian vehicle. Knowing which agency or programme owns which name is usually enough to answer the question.

DRDO, Missiles and Defence Technology

The Defence Research and Development Organisation (DRDO) develops India's indigenous defence systems. AFCAT especially likes the missile family:

• Agni — surface-to-surface ballistic missiles; long range (Agni-V is intercontinental class).
• Prithvi — short-range surface-to-surface ballistic missile.
• Akash — medium-range surface-to-air missile.
• Nag — anti-tank guided missile.
• BrahMos — supersonic cruise missile, a India–Russia joint venture, named after the Brahmaputra and Moskva rivers.

A second layer worth a glance is the difference between a ballistic and a cruise missile. A ballistic missile follows a high, arching trajectory — powered briefly, then falling under gravity like a thrown stone — which is why Agni and Prithvi are grouped together. A cruise missile such as BrahMos flies low and stays powered throughout, steering like a small pilotless aircraft toward its target. BrahMos is also notable as the world's fastest operational supersonic cruise missile and has air, land and sea-launched versions, which makes it a natural Air Force favourite in AFCAT. DRDO is headquartered in New Delhi, a small fact that occasionally appears on its own.

Air Force Aircraft and Systems

As an Air Force exam, AFCAT rewards aircraft awareness. Keep these straight:

• HAL Tejas — indigenous Light Combat Aircraft (LCA) built by Hindustan Aeronautics Limited.
• Rafale — multirole fighter inducted from France (Dassault).
• Sukhoi Su-30 MKI — mainstay air-superiority fighter, built under licence by HAL.
• Tejas, Prachand (LCH) — the Light Combat Helicopter, also HAL.

Supporting systems worth a line: the S-400 is a long-range surface-to-air missile defence system, and AWACS / Netra provide airborne early warning by carrying a rotating radar high above the battlefield. Two more names recur: HAL (Hindustan Aeronautics Limited), the public-sector firm that builds most Indian military aircraft, and the indigenous AMCA (Advanced Medium Combat Aircraft), India's fifth-generation stealth fighter under development. When a question lists fighters, the trick is to spot the indigenous one (Tejas, AMCA) versus the imported ones (Rafale from France, Su-30 from Russia). Also remember that India operates a three-service structure — Army, Navy and Air Force — under the Ministry of Defence, with the Chief of Defence Staff (CDS) as a single-point military adviser.

Everyday Physics Facts

Basic physics shows up as quick application questions. The high-frequency facts:

• Sound needs a medium and travels fastest in solids, slower in liquids, slowest in gases — the reverse of light.
• Light travels fastest in vacuum (≈ 3 × 10⁸ m/s) and bends (refracts) entering a denser medium.
• A convex lens converges light (used to correct hypermetropia / long-sight); a concave lens diverges it (corrects myopia / short-sight).
• The unit of force is the newton; of power the watt; of pressure the pascal.

A few more reliable physics one-liners are worth memorising. Echo is the reflection of sound, used in SONAR to measure ocean depth; RADAR uses radio waves to detect aircraft and is central to air-defence, which makes it AFCAT-relevant. The SI unit of electric current is the ampere, of resistance the ohm, of energy the joule, and of frequency the hertz. Mirrors also recur: a concave mirror can form magnified images and is used in shaving mirrors and headlights, while a convex mirror always gives a smaller, wider view, which is why it is used as a vehicle rear-view mirror. Understanding the everyday use of each device makes these questions almost automatic.

Everyday Chemistry You Should Know

Chemistry questions are usually about common substances and gases:

• Common salt = sodium chloride (NaCl); baking soda = sodium bicarbonate (NaHCO₃); washing soda = sodium carbonate.
• CO₂ turns lime water milky; O₂ supports combustion; N₂ makes up about 78% of air.
• An acid turns blue litmus red (pH < 7); a base turns red litmus blue (pH > 7); pure water is neutral at pH 7.
• The lightest element is hydrogen; the most abundant gas in air is nitrogen.

Biology and Human Body Essentials

Biology questions cluster around the human body, diseases and nutrition:

• The powerhouse of the cell is the mitochondrion; photosynthesis happens in the chloroplast.
• Vitamin C deficiency causes scurvy; Vitamin D deficiency causes rickets; Vitamin A deficiency causes night blindness.
• The human body has 206 bones in an adult; blood is pumped by a four-chambered heart.
• Insulin (from the pancreas) regulates blood sugar; its deficiency causes diabetes.

It also pays to separate diseases by the type of organism that causes them, because AFCAT loves this distinction. Viral diseases include dengue, polio, rabies, measles and COVID-19; bacterial diseases include tuberculosis, cholera, typhoid and tetanus; while malaria is caused by a protozoan spread by the female Anopheles mosquito. On nutrition, remember that proteins are the body's building blocks, carbohydrates and fats supply energy, and minerals such as iron (for haemoglobin) and calcium (for bones and teeth) keep the body functioning. Blood groups, the role of the kidney in filtering blood, and the lungs in gas exchange are other small facts that round out this cluster nicely.

Computers and Information Technology

A short, predictable cluster of computer basics appears almost every cycle:

• CPU is the brain of the computer; RAM is volatile (temporary) memory, ROM is non-volatile.
• 1 byte = 8 bits; sizes scale KB → MB → GB → TB.
• The full forms matter: HTTP (HyperText Transfer Protocol), URL (Uniform Resource Locator), GUI (Graphical User Interface), CPU (Central Processing Unit).
• Input devices: keyboard, mouse, scanner; output devices: monitor, printer, speaker.

Worked Example: Reasoning to the Answer

Even factual GA can be cracked by elimination when memory is shaky. Watch the method.

By tying each option to its one defining tag (range + type), you reach the answer even if only one fact is firm.

Traps and How to Dodge Them

Examiners reuse a small set of confusions. Pre-empt them:

• Aircraft vs engine: Tejas (aircraft) vs Kaveri (engine).
• Launch vehicle vs satellite: PSLV/GSLV are rockets; INSAT, GSAT, Cartosat are satellites.
• Ballistic vs cruise: Agni/Prithvi are ballistic; BrahMos is cruise.
• Vitamin–disease pairs: mixing C/D/A deficiencies is the classic distractor.

Previous-Year Style Practice

Practise framing facts as both ‘name the mission’ and ‘name the feature’ questions; AFCAT swaps the asked variable freely.

Quick Revision