RRB NTPC Undergraduate CBT 1 2025 PYQs

Concept: Decode each symbol from left to right and build the family tree.

1. M × N: M is the father of N. N ÷ O: N is the mother of O.
2. O – P: O is the brother of P; P + Q: P is the sister of Q; Q – R: Q is the brother of R.
3. So O, P, Q, R are siblings – R is a child of N.
4. M is the father of R’s mother → R’s mother’s father.

Trick: Siblings share parents – once R joins the O-P-Q group, R’s mother is N.

Answer: (D) Mother's father

Concept: A person who is a Consultant, a Banker and an Advocate lies in the region common to all three circles.

1. The central region (common to Bankers, Advocates and Consultants) shows 32.
2. 17 = Bankers and Consultants only; 11 = Advocates and Consultants only; 19 = Bankers and Advocates only – none of these is in all three.

Trick: “X as well as Y and Z” = the central triple-overlap number.

Answer: (B) $32$

Concept: Letters common to both words take the digits common to both codes.

1. FISH → 1 9 6 3; HITS → 6 9 8 3.
2. Common letters H, I, S ↔ common digits 6, 9, 3.
3. F appears only in FISH ↔ 1; T appears only in HITS ↔ 8.

Trick: Eliminate the common letters and digits; the leftover pair is the answer.

Answer: (A) 8

Concept: Look at the differences between consecutive terms.

1. Differences: $8,16,24,32$ (multiples of 8).
2. Next difference $=40$.
3. $291+40=331$

Trick: Differences = table of 8.

Answer: (B) $331$

Concept: Look for Consonant – Consonant – Vowel (vowels: A, E, I, O, U; Y is a consonant).

1. C Y A ✓
2. L K E ✓
3. J C O ✓
4. P T I ✓ – total 4 (G in “I G I” fails as I before it is a vowel).

Trick: Start from each vowel and look at the two letters before it – both must be consonants.

Answer: (C) 4

Concept: Replace letters by operators, then apply BODMAS.

1. $220+56÷14-17\times 12$
2. $=220+4-204$
3. $=20$

Trick: Do ÷ and × first: $56÷14=4$, $17\times 12=204$.

Answer: (D) $20$

Concept: Compare each letter with its partner.

1. NPS → KMP: each letter $-3$. DOQ → ALN: each letter $-3$.
2. HDP → EAM: H$-3$=E, D$-3$=A, P$-3$=M ✓.
3. SEL → OAI is $-4$; EHL → CFI is $-2,-2,-3$; DHG → BEC is $-2,-3,-4$.

Trick: Check the first letter of each option with $-3$: only H→E works.

Answer: (C) HDP : EAM

Concept: Look for Even – Even – Even.

1. Even digits in the series: 8, 4, 2, 8, 6, 6, 6.
2. Only 6 6 stand together: the first 6 is preceded by 5 (odd), the second is followed by 1 (odd).
3. No even digit has even digits on both sides → none.

Trick: You need three even digits in a row – scan for that block first.

Answer: (B) None

Concept: Compare the change from the first cluster to the second.

1. NV → JR: $-4,-4$; GT → CP: $-4,-4$; QF → MB: $-4,-4$.
2. HL → FD: H$-2$=F, L$-8$=D – different.

Trick: Check just the first letters: N→J, G→C, Q→M are all $-4$; H→F is $-2$.

Answer: (C) HL – FD

Concept: Decode W = F $ K @ L * G step by step (= son, $ sister, @ wife, * father).

1. W = F: W is the son of F.
2. F $ K: F is the sister of K. K @ L: K is the wife of L.
3. L * G: L is the father of G, so K (L’s wife) is G’s mother.
4. F is G’s mother’s sister, and W is her son → mother’s sister’s son.

Trick: Wife of the father = mother; the mother’s sister’s son is a maternal cousin (mausi’s son).

Answer: (C) Mother's sister's son

Concept: Split the series into two alternate series.

1. Odd positions: $4,8,16,32$ – each $\times 2$.
2. Even positions: $4,12,28,?$ – differences $8,16$, so next difference $32$.
3. $?=28+32=60$

Trick: When numbers jump irregularly, check alternate terms first.

Answer: (D) $60$

Concept: Replace letters by signs, then apply BODMAS.

1. A = $÷$, B = $\times$, C = $+$, D = $-$
2. $1-40÷7\times 7+46$
3. $40÷7\times 7=40$ (left to right), so $1-40+46=7$

Trick: $÷7$ and $\times 7$ cancel each other – no fractions needed.

Answer: (D) $7$

Concept: Write the position values of the letters and find the gaps.

1. NRT: $14,18,20$ → $+4,+2$; JNP: $10,14,16$ → $+4,+2$
2. SWY: $19,23,25$ → $+4,+2$
3. QUO: $17,21,15$ → $+4,-6$ ✗

Trick: EJOTY: E5, J10, O15, T20, Y25 – reach any letter quickly.

Answer: (D) QUO

Concept: Check the gap between consecutive letters (wrapping Z → A).

1. MKI: $13,11,9$ → $-2,-2$; QOM: $17,15,13$ → $-2,-2$
2. BZX: B → Z → X is also $-2,-2$ (going back past A)
3. CBY: $3,2,25$ → $-1,-3$ ✗

Trick: In backward series, after A comes Z – B$-2$ = Z.

Answer: (C) CBY

Concept: Treat each letter position and the number separately.

1. 1st letter: O → G → Y → Q → I (each $-8$)
2. 2nd letter: K → C → U → M → E ($-8$); 3rd letter: H → Z → R → J → B ($-8$)
3. Numbers: $41,47,53,59,65$ (each $+6$)

Trick: Moving back 8 = moving forward 18 (since $26-8=18$).

Answer: (C) IEB 65

Concept: Take first differences, then look for a pattern in them.

1. Differences: $9,17,22,30,35$
2. Second differences: $8,5,8,5$ → next is $8$
3. Next difference $=35+8=43$; $?=123+43=166$

Trick: Alternating $+8,+5$ in the differences = two-level series.

Answer: (D) $166$

Concept: Find the shift for each letter of the first pair and verify it on the second pair.

1. FACN → LFIS: F$+6$=L, A$+5$=F, C$+6$=I, N$+5$=S
2. DUAH → JZGM: same $+6,+5,+6,+5$ ✓
3. VJSW: V$+6$=B, J$+5$=O, S$+6$=Y, W$+5$=B → BOYB

Trick: Wrap round: V(22)$+6=28-26=2$ = B.

Answer: (C) BOYB

Concept: Replace letters by signs and use BODMAS.

1. P = $\times$, Q = $÷$, R = $-$, S = $+$
2. $(96÷12)\times 5+(42÷7)\times 8-12\times 5$
3. $=8\times 5+6\times 8-60=40+48-60=28$

Trick: Solve brackets first, then all $\times$, then $+/-$.

Answer: (C) $28$

Concept: Each cluster is of the form X Y X; track letters and numbers separately.

1. Outer letters: R → N → J → F → B (each $-4$)
2. Middle letter: T → P → L → H → D (each $-4$)
3. Numbers: $77,72,67,62,57$ (each $-5$)

Trick: Middle letter is always 2 ahead of the outer letter: B + 2 = D.

Answer: (A) BDB 57

Concept: Total = rank from top + rank from bottom $-1$ (the person is counted twice).

1. Rank from top $=25$, rank from bottom $=67$
2. Total $=25+67-1=91$

Trick: Always subtract 1 – Raman is included in both counts.

Answer: (D) $91$