Science and Technology as a GK topic for SSC MTS is not about memorising textbook derivations. It is about knowing who did what, when, and with what tool — and being able to place key inventions, missions, and discoveries in context.
Think of this section as three broad buckets:
Bucket 1 — Scientific Discoveries & Inventors. Questions ask you to match a scientist to their discovery, or pin a year to a breakthrough. The Camillo Golgi–nerve staining question from 2023 is a perfect example. SSC loves scientists who won Nobel Prizes or made a first of some kind.
Bucket 2 — Space Technology. ISRO missions (Chandrayaan, Mangalyaan, Gaganyaan), the International Space Station, orbit altitudes, and satellite classifications appear regularly. This sub-area has grown in question frequency as ISRO has made global headlines.
Bucket 3 — Everyday Technology & Fuels. CNG vs LPG vs petrol, nuclear reactors, renewable energy, and recent tech (5G, electric vehicles, semiconductors) fall here. The angle is always practical: what is it used for, why is it preferred, what is the key property?
Here is the analogy that ties this together: imagine Science and Technology GK as a newspaper from different years. Some pages are old (Golgi's 1873 discovery), some are from last decade (ISRO's Mangalyaan, 2013), and some are from last year (recent launches). Your job is to read across all these pages and pick the headline fact from each story.
The SSC MTS pattern favours direct, single-fact questions. You will almost never be asked to explain how something works. You will be asked who, when, which, how far, what altitude, what gas. That means your preparation strategy should prioritise anchoring one solid data point per concept rather than deep-reading each topic.
ISRO's Major Missions — the facts you need
Orbit Classifications — anchor these numbers
| Orbit | Altitude Range | Key Example | |---|---|---| | Low Earth Orbit (LEO) | 160–2,000 km | ISS (~400 km), Chandrayaan | | Medium Earth Orbit (MEO) | 2,000–35,786 km | GPS satellites | | Geostationary Orbit (GEO) | ~35,786 km | INSAT weather satellites |
The ISS orbits at approximately 400 km in LEO. This number appears directly in PYQs — lock it in.
Satellite Types by Purpose
Key systems and their roles (at the level SSC tests):
CNG vs LPG — the classic confusion point
CH₄), compressed to high pressure. Used in vehicles — especially public transport buses, auto-rickshaws, taxis. Cleaner combustion, lower particulate emission compared to petrol/diesel.Nuclear Technology
These come up as direct one-liner questions in SSC MTS:
The ISS is at 400 km — not 5,000, not 22,000, not 1,000. The wrong options in the PYQ are designed to catch you if you confuse ISS altitude with GEO altitude (35,786 km) or MEO. Pattern anchor: ISS is in LEO, and LEO tops out at 2,000 km. Of the four options (400, 1,000, 5,000, 22,000), only 400 fits LEO. Eliminate by orbit type, not by rote memory. Standard guessing time: 30s. Elimination method: 8s.
CNG → Commuter vehicles (buses, autos, taxis). LPG → Kitchen Ladle (cooking). Both are gas fuels, but the usage context splits cleanly. When a question says "fuel used in vehicles," the answer is CNG, not LPG — even though LPG can power vehicles, CNG is the dominant and intended answer in Indian government-exam context. This pattern holds across SSC, RRB, and UPSC Prelims questions. Saves you a 50-50 guess every time.
Camillo Golgi is tested on two distinct facts: (1) invented the black reaction staining technique for nerve tissue, (2) published the first photograph of a stained nerve cell in 1873. The distractor in PYQs is always Paul Ehrlich (who also worked on staining, but for bacteria and immune cells — the precursor to chemotherapy). Golgi = nerve staining. Ehrlich = bacteria/immunology staining. Two seconds of contrast locks this in permanently.
Build a chain: 1975 (Aryabhata, first satellite) → 2008 (Chandrayaan-1, Moon) → 2013 (Mangalyaan, Mars — first Asian country, first attempt) → 2023 (Chandrayaan-3, south pole first) → 2023 (Aditya-L1, Sun). Each link is a "first of some kind." If you memorise the chain in order, year-based questions resolve instantly. Standard look-up time: 20s. Chain recall: 5s.
BrahMos is named from Brahmaputra (India) + Moskva (Russia). This naming fact is a common filler in options — and knowing the joint India-Russia origin prevents you from confusing it with a purely indigenous system. Tejas = India only (HAL). BrahMos = India + Russia. Two-second split that eliminates wrong options in defence technology questions.
When you see a Science & Technology GK question in the exam, run this quick decision tree:
Step 1 — Classify the question type. Is it asking about a person (who invented/discovered)? A place or number (altitude, distance, year)? A mission or programme name? Or a fuel/material property?
Step 2 — Apply the right anchor.
Step 3 — Eliminate aggressively. SSC MTS options are usually designed so that two distractors are obviously wrong. Drop those first. Then apply your anchor fact to split the remaining two.
Step 4 — Do not overthink recent events. If the question is about something from the last 2 years and you are unsure, pick the option that matches India's known direction — ISRO, indigenous defence, digital payments. SSC MTS leans toward India-positive achievements in its Science & Technology questions.
Total time per question: target 25–40 seconds.
Why this question: This question tests knowledge of a specific historical scientific first — a category SSC MTS returns to repeatedly because it has a clean, verifiable single answer.
Solving path: The question pins a year (1873) and a specific technique (black reaction, nerve tissue photograph). Paul Ehrlich worked on staining but for immunology and bacteria — eliminate. William Harvey is famous for blood circulation — unrelated. Gunter Blobel worked on protein transport within cells — different era and field. Camillo Golgi is the only scientist associated with nerve tissue staining and the black reaction technique. Select option 4.
Why this question: Fuel-type questions are frequent in SSC MTS because they connect everyday technology to environmental awareness — a favourite theme. The CNG vs LPG confusion catches many aspirants.
Solving path: Nitrogen gas and Helium gas are inert/non-combustible and not used as vehicle fuels — eliminate both immediately. That leaves LPG and CNG. LPG is primarily used for cooking (domestic cylinders). CNG is the gas specifically used in vehicles, particularly public transport across Indian cities. Select Compressed Natural Gas (option 4).
Why this question: Orbit altitude is a classic number-based question. SSC MTS uses large wrong numbers (5,000, 22,000) to exploit aspirants who confuse ISS altitude with satellite belt altitudes. This is a pure elimination question if you know orbit categories.
Solving path: The ISS is described as being in "low Earth orbit." LEO ranges from about 160 km to 2,000 km. Eliminate 5,000 km and 22,000 km immediately — those are MEO range figures. Between 400 km and 1,000 km: the ISS specifically orbits at approximately 400 km, a well-documented figure. Select 400 (option 3).
Confusing CNG and LPG for vehicle use. LPG can power vehicles, but in the Indian exam context and in real-world dominant usage, CNG is the answer for vehicle fuel questions. Do not let the fact that LPG-powered vehicles exist confuse you here.
Placing the ISS at GEO altitude. Many aspirants know that communication satellites are at ~36,000 km and incorrectly apply that number to the ISS. The ISS is in LEO at ~400 km — a completely different altitude band.
Mixing up Golgi with Ehrlich for staining techniques. Both scientists worked on biological staining, but Ehrlich's work was on bacterial and immunological staining. Golgi's black reaction was specifically for nerve tissue. The year 1873 and the phrase "nerve cell photograph" are your anchors.
Assuming Mangalyaan was not India's first Mars mission. Some options include distractor missions. Mangalyaan (2013) was India's first and only Mars mission so far, and the first by any Asian country.
Confusing Tejas with BrahMos on indigenous vs joint development. Tejas is entirely indigenous (HAL). BrahMos is a joint India-Russia project. Questions sometimes ask "which is India's own" — the answer is Tejas.
Ignoring NavIC in satellite navigation questions. GPS is American. GLONASS is Russian. Galileo is European. NavIC is India's own navigation satellite system. If a question asks specifically about India's navigation system, it is NavIC — not GPS.