RRB NTPC Undergraduate CBT 1 2024 PYQs

Concept: Trace each move on a grid; facing west, a right turn means north.

1. 325 m west → showroom; right turn → north 220 m → fitness centre.
2. Right → east 200 m; right → south 220 m: he is back on the starting line.
3. Gap from start $=325-200=125\text{m}$

Trick: The two 220 m legs cancel; only east–west matters: $325-200=125$.

Answer: (A) 125 m

Concept: Swap the signs first, then apply BODMAS.

1. $28+125\times 5-12÷3$ becomes $28-125÷5+12\times 3$
2. $=28-25+36$
3. $=39$

Trick: Rewrite the whole expression with new signs before calculating – never swap mid-way.

Answer: (C) 39

Concept: Find the single operation linking each pair.

1. $37+25=62$; $52+25=77$ → rule: add 25.
2. Check options: $81+25=106$ ✗, $69+25=94$ ✗, $64+25=89$ ✗, $46+25=71$ ✓

Trick: When both pairs show the same difference, just look for that difference in the options.

Answer: (D) 46, 71

Concept: Track each letter position and the number separately.

1. 1st letters: N, J, F, B, X, T (each −4).
2. 2nd letters: U, Q, M, I, E, A (−4); 3rd letters: B, X, T, P, L, H (−4).
3. Numbers: 63, 54, 45, 36, 27, 18 (−9).

Trick: After B, going back 4 wraps around: B → X; after E → A, after L → H.

Answer: (D) TAH 18

Concept: Compare position gaps: 1st → 2nd and 2nd → 3rd letter.

1. ORM: 15, 18, 13 → +3, −5; VYT: 22, 25, 20 → +3, −5; RUP: 18, 21, 16 → +3, −5.
2. LOI: 12, 15, 9 → +3, −6 ✗

Yaad rakhein: EJOTY – E5, J10, O15, T20, Y25 helps convert letters fast.

Answer: (D) LOI

Concept: Check the differences between consecutive terms.

1. Differences: 17, 21, 25, 29, 33 (each +4).
2. Next $=145+33=178$

Trick: Second differences constant (+4) → next difference is simply last + 4.

Answer: (D) 178

Concept: Check the gap inside each cluster and between the clusters.

1. SV-UX: S+3 = V, S+2 = U, U+3 = X. DG-FI and BE-DG follow the same +3 / +2 / +3 pattern.
2. EI-HK: E+4 = I ✗ (gap is 4, not 3).

Trick: Check the internal gap of the first cluster first – it exposes the odd one fastest.

Answer: (D) EI-HK

Concept: Fix the definite positions first, then test the cases.

1. S = 3rd from left, Z = 8th (right end).
2. Only U between S and W: W at 5 (U at 4) or W at 1 (U at 2). If W = 1, V must be at 2, which is U – impossible. So U = 4, W = 5.
3. T next to S and Y → T = 2, Y = 1; V next to W → V = 6; X = 7.
4. Order: Y T S U W V X Z → right of W: V, X, Z = 3.

Trick: Use "only U sits between" to make two cases and kill one quickly.

Answer: (A) Three

Concept: Check the differences between consecutive terms.

1. Differences: 88, 96, 104, 112 (each +8).
2. Next difference $=120$ → $842+120=962$

Trick: Differences rising by a fixed amount → keep adding that amount.

Answer: (C) 962

Concept: Draw the least-overlap Venn diagram; a conclusion follows only if it is true in every possible diagram.

1. Forests lie inside Hills; Deserts overlap Hills.
2. I: "All hills are forests" – Hills can be bigger than Forests → not certain ✗.
3. II: "Some deserts are hills" – conversion of "Some hills are deserts" ✓.

Yaad rakhein: "Some A are B" ⇔ "Some B are A" always; "All A are B" never gives "All B are A".

Answer: (A) Only Conclusion II follows

Concept: "All A are B" and "All B are C" give nested circles A ⊂ B ⊂ C.

1. Bottles ⊂ Ludo ⊂ Dancers.
2. I: Ludo lies inside Dancers, so some dancers are ludo ✓.
3. II: Bottles lie inside Ludo, which lies inside Dancers → all bottles are dancers ✓.

Yaad rakhein: All + All = All (A → C), and every "All A are B" also gives "Some B are A".

Answer: (A) Both conclusions (I) and (II) follow.

Concept: Track each letter position and the number separately.

1. 1st letters: I, M, Q, U, Y (+4).
2. 2nd letters: U, R, O, L, I (−3); 3rd letters: P, N, L, J, H (−2).
3. Numbers: −1, −3, −9, −27, −81 (×3).

Trick: The number part alone (×3 → −9) cuts the options to C and D; the 3rd letter L picks C.

Answer: (C) QOL −9

Concept: Total $=$ rank from top $+$ rank from bottom $-1$.

1. Total $=7+38-1$
2. $=44$

Trick: Subtract 1 because Shekhar is counted in both ranks.

Answer: (C) 44

Concept: Decode the chain step by step and draw a family tree.

1. Q ÷ E: Q is the father of E. E − R: E is the sister of R → Q is also R's father.
2. R × C: R is the wife of C. C + D: C is the son of D.
3. For D: C = son, R = son's wife, Q = son's wife's father.

Trick: Read the chain from D's side backwards: son → his wife → her father.

Answer: (C) Son's wife's father

Concept: Find the shift for each letter position.

1. HOLN → XGBF: H−10 = X, O−8 = G, L−10 = B, N−8 = F (pattern −10, −8, −10, −8).
2. Check TIXH → JANZ: T−10 = J, I−8 = A, X−10 = N, H−8 = Z ✓
3. PKTJ: P−10 = F, K−8 = C, T−10 = J, J−8 = B → FCJB

Trick: −10 is the same as +16; wrapping round the alphabet is allowed (H−8 → Z).

Answer: (D) FCJB

Concept: Compare position gaps: 1st → 2nd and 2nd → 3rd letter.

1. HOK: 8, 15, 11 → +7, −4; FMI: 6, 13, 9 → +7, −4; LSO: 12, 19, 15 → +7, −4.
2. JQN: 10, 17, 14 → +7, −3 ✗

Trick: All have +7 first, so only the second gap decides.

Answer: (A) JQN

Concept: Swap the signs first, then apply BODMAS.

1. $26\times 2-21+7÷4$ becomes $26÷2+21-7\times 4$
2. $=13+21-28$
3. $=6$

Trick: Rewrite the whole expression with the new signs before calculating.

Answer: (B) 6

Concept: Look at the alternate pattern of differences.

1. 934 −10 → 924 +1 → 925 −10 → 915 +1 → 916 −10 → 906
2. Next: $906+1=907$, then $907-10=897$ ✓

Trick: Always verify with the term after the blank (897).

Answer: (C) 907

Concept: The letter common to both words takes the digit common to both codes.

1. MAZE → 3527, AIDS → 2416.
2. Common letter: A; common digit: 2.
3. So A = 2.

Trick: Codes are jumbled, so match by common elements, not by position.

Answer: (B) 2

Concept: Find the shift for each letter position.

1. WPKD → TNHB: W−3 = T, P−2 = N, K−3 = H, D−2 = B (pattern −3, −2, −3, −2).
2. Check KHYV → HFVT ✓
3. BBPP: B−3 = Y, B−2 = Z, P−3 = M, P−2 = N → YZMN

Trick: Going back from B wraps round: B−1 = A, B−2 = Z, B−3 = Y.

Answer: (C) YZMN