Rau’s IAS Prelims Compass 2025 Science and Technology PDF

What is inside

Snapshot

Why a separate science magazine

Science questions in the Prelims paper often begin from a headline: a launch, a vaccine, a new material, a policy on semiconductors or a milestone in quantum computing. The question then asks for the underlying idea. This magazine collects such headlines for the cycle and presents them with enough background to answer the follow-up.

How to read it

Go through it theme by theme instead of page by page. Spend longer on topics that carry a basic science concept, such as how a technology works, what its applications are, and which Indian institution is involved. Skip lines of general commentary and keep the technical core.

1. Make a list of missions, programmes and projects with the agencies that run them.
2. Note the full forms of acronyms; the exam likes to test them.
3. Write a one-line definition for each new term.

Position in the syllabus

Prelims General Studies includes general science and developments in science and technology as an item, with current events as a companion topic. Mains Paper 3 develops the same area into applications and indigenisation. A Prelims magazine serves the first, so read its facts accurately and do not expect long argumentation.

Study approach for the final months

• Read the magazine once in full.
• Revisit only the pages you marked, a week later.
• Pair it with a topic-wise quiz to test recall.

A short question drill

Every week, write ten questions of your own from the pages you read, using the Prelims statement format with four options. Trade them with a study partner if you can. Setting questions forces you to notice the exact wording in a text, which is the habit the exam rewards.

Common wording traps

Science questions in the objective format like absolute words such as only, always and all. When a statement about a technology sounds too sweeping, it is often the wrong one. While reading, note the limits of each technology, including what it cannot do, as those boundaries give you the confidence to reject overstated options.

Remember

Because this is a 2025 edition, its facts will age, so check for updates if you are preparing for a later year. Competer also offers printed UPSC current affairs notes for readers who prefer paper.