RRB ALP CBT 1 17 Feb 2026 Shift 1 – Question Paper

Concept: Successive changes multiply: final = $1.10\times 1.20\times 1.15$ of the original.

1. $1.1\times 1.2=1.32$
2. $1.32\times 1.15=1.518$
3. Increase $=51.8\mathrm{\%}$

Short trick: Two-step formula $a+b+\frac{ab}{100}$: 10 and 20 → 32; then 32 and 15 → $32+15+4.8=51.8\mathrm{\%}$.

Answer: (B) 51.8%

Concept: Each position of the groups moves back by 6 letters (cyclic).

1. 1st letters: C → W → Q → K → E (−6 each)
2. 2nd letters: L → F → Z → T → N (−6)
3. 3rd letters: W → Q → K → E → Y (−6)

Short trick: Check only the first letter: K − 6 = E leaves ENY/ENT/ECD; second letter T − 6 = N leaves ENY/ENT; third E − 6 = Y → ENY.

Answer: (B) ENY

Concept: Sound is a mechanical wave: particles only vibrate about their mean positions; the disturbance (energy) moves forward.

1. A vibrating source compresses and rarefies the nearby layer of medium
2. Each particle passes the disturbance to the next and returns to its place
3. So the disturbance travels, not the particles

Short trick: Memory hook: a "Mexican wave" in a stadium – the wave goes round, the people stay in their seats.

Answer: (D) The disturbance created by the sound source

Concept: The World Para Athletics Championships 2025 were held in New Delhi (Jawaharlal Nehru Stadium), 27 Sept – 5 Oct 2025.

1. It was the first time India hosted this championship
2. India achieved its best-ever medal haul at the event

Short trick: Hook: "Para-games at the capital" – Delhi, JLN Stadium.

Answer: (B) New Delhi