Home / Exams / NDA / NDA_II_2023 / Question
NDA · 2023 Science & Technology › Physics & Chemistry
The flash of lightning is seen before the thunderstorm is heard. It verifies that
🔎 The pattern behind this question
This is the same idea UPSC keeps returning to. Start a free trial to see the answer and the full map.
Across examsCSE 3 · NDA 2 · CDS 1
Evolution“Speed of light” tested across 5 years (1985–2023)

Study how UPSC repeats — not just the papers

₹199 / 1 year · Founding Member

Full access unlocks the three things no PYQ PDF gives you:
① Cross-exam learning — see the same idea recur across CSE, CAPF, CDS and NDA.
② Topic evolution — how each idea is framed, year by year.
③ Question intelligence — every PYQ + answer, linked to related concepts and similar questions.

e.g. Round Table Conference: CDS 2017 → CSE 2017 → … → CAPF 2024

15 days free, no card required — then ₹199 for 1 year.

Start your 15-day free trial →
💬 Feedback

Send feedback