RRB ALP CBT 1 18 Feb 2026 Shift 1 – Question Paper

Concept: Mean proportional of $a$ and $b$ is $\sqrt{ab}$.

1. $\sqrt{49\times 64}=\sqrt{49}\times \sqrt{64}$
2. $=7\times 8=56$

Short trick: Both are perfect squares, so just multiply their roots: $7\times 8$.

Answer: (A) 56

Concept: Replace the letters by signs, then apply BODMAS.

1. 79 − 12 × 4 + 100 ÷ 5
2. = 79 − 48 + 20
3. = 51

Short trick: Do × and ÷ first (48 and 20), then 79 − 48 + 20 = 51.

Answer: (A) 51

Concept: In an onion-peel mount stained with safranin/iodine, the nucleus and cell wall take up the stain strongly, the cytoplasm only faintly.

1. The nucleus is rich in DNA/chromatin and stains dark.
2. The cytoplasm is mostly water with few stain-binding materials, so it is very lightly stained.
3. Hence cytoplasm: very little stained.

Short trick: Memory hook: "Nucleus dark, cytoplasm light" — the nucleus looks like a dark dot in a pale cell.

Answer: (A) Very little stained

Concept: The Digital Personal Data Protection (DPDP) Rules, 2025 were notified to operationalise the Digital Personal Data Protection Act, 2023.

1. The DPDP Act, 2023 sets out rights of data principals and duties of data fiduciaries and creates the Data Protection Board of India.
2. The Rules, 2025 give the procedures (consent managers, breach intimation, Board functioning) needed to implement the Act.

Short trick: Rules always carry the same name as their parent Act: DPDP Rules → DPDP Act, 2023.

Answer: (A) Digital Personal Data Protection Act, 2023