RRB NTPC Undergraduate CBT 1 2025 PYQs

Concept: Treat the first letter, second letter and number as three separate series.

1. First letters M, N, P, S: $+1,+2,+3$ → next $+4$: S + 4 = W.
2. Second letters U, Q, N, L: $-4,-3,-2$ → next $-1$: L − 1 = K.
3. Numbers $1,4,16,64$: $\times 4$ → $256$. Term = WK256.

Trick: Only option D starts with W – the first-letter series alone settles it.

Answer: (D) WK256

Concept: Vowels move one step forward, consonants one step back; then read the required position.

1. CURRENT: C→B, U→V, R→Q, R→Q, E→F, N→M, T→S.
2. New group: B V Q Q F M S.
3. Fourth from the left = Q.

Trick: Only the 4th letter is asked – the 4th letter of CURRENT is R (consonant) → R − 1 = Q. No need to convert the whole word.

Answer: (B) Q

Concept: Number seats 1–7 from the left (all face north, so right = higher number).

1. 'Only E sits to the left of K' → E = 1, K = 2. Four people between E and T → T = 6.
2. I, C, R are consecutive with C in the middle; free seats 3, 4, 5, 7 → they take 3, 4, 5. I is not next to T (6) → I = 3, C = 4, R = 5.
3. S takes the last seat, 7 – the extreme right.

Trick: 'Only X sits to the left of Y' pins X and Y to seats 1 and 2 – the strongest clue, start there.

Answer: (A) S

Concept: Number positions 1 (bottom) to 7 (top) and convert each 'between' clue into a distance.

1. Five boxes above D → D = 2. Three between D and C → C = 6. Four between C and S → S = 1.
2. Only E between C and B → B = 4, E = 5 (B = 8 is impossible). R above C → R = 7.
3. Q takes the last place, 3. Between Q (3) and S (1) there is only D → one box.

Trick: 'n boxes between' $=$ distance $n+1$; choose the side that stays within 1–7.

Answer: (B) One

Concept: Decode the expression pair by pair, then build the family tree.

1. S + D: S is the son of D. D ÷ F: D is the father of F → S and F are siblings. F – H: F is the brother of H → H is also D's child, so S is H's brother.
2. H × K: H is the wife of K.
3. So S is the brother of K's wife → K's wife's brother (brother-in-law).

Trick: Gender from the code: 'son', 'brother' make S, F male; 'wife' makes H female – then the relation reads off the tree.

Answer: (A) Wife's brother

Concept: Look for the pattern consonant–consonant–vowel and count the middle letter.

1. Vowels present: E (positions 6, 9, 15), A (16), U (21). Check the letter just before each vowel and the one before that.
2. H J E (4–6) ✓; K D E (7–9) ✓; V N E (13–15) ✓; R Z U (19–21) ✓. Before A (16) is E (a vowel) – not counted.
3. Total = 4.

Trick: Start from each vowel and look two letters back – far faster than scanning every consonant.

Answer: (A) Four

Concept: Split into three letter series and one number series.

1. 1st letters N, P, R, T ($+2$) → V; 2nd letters F, I, L, O ($+3$) → R; 3rd letters G, K, O, S ($+4$) → W.
2. Numbers $49,36,25,16=7^2,6^2,5^2,4^2$ → $3^2=9$.
3. Next term: VRW 9.

Trick: Perfect squares counting down → next is 9; this alone leaves A and C, and the first letter V picks A.

Answer: (A) VRW 9

Concept: Decode each symbol, note genders, and climb the family tree from W to S.

1. S + T: S is the husband of T. T – U: T is the mother of U → S is U's father.
2. U ÷ V: U is the father of V. V × W: V is the sister of W → U is also W's father.
3. So S is the father of W's father → father's father (paternal grandfather). W × Y only tells that W is female.

Trick: 'Husband of the mother' = father; stack two father-steps and you get the grandfather.

Answer: (B) Father's father

Concept: Each letter moves by a fixed step (wrapping Z → A) and the number changes by a constant.

1. E → X → Q → J: each $-7$ (E(5) − 7 = −2 → X(24)). Next: J(10) − 7 = C(3).
2. A → T → M → F: $-7$ → F(6) − 7 = −1 → Y(25). W → P → I → B: $-7$ → B(2) − 7 = −5 → U(21).
3. Numbers $91,98,105,112$: $+7$ → $119$. Term: CYU 119.

Trick: Every letter $-7$ and number $+7$ – one step for all; when the count goes below 1, add 26.

Answer: (A) CYU 119

Concept: A word common to two sentences has the code common to both coded sentences.

1. 'van elf sand' = ld ii ne and 'elf poem desk' = ir le ii.
2. The only common word is 'elf'; the only common code is 'ii'.
3. Hence elf = ii.

Trick: Match common words with common codes first – one glance solves most sentence-coding questions.

Answer: (C) ii

Concept: In a three-circle Venn diagram, "Teachers who are also Dentists but not Surgeons" is the part of the Teacher–Dentist overlap that lies outside the Surgeons circle.

1. The Teachers and Dentists circles overlap in two regions: one inside Surgeons (23) and one outside Surgeons (29).
2. We need only the region outside the Surgeons circle → 29.
3. 14 = only Teachers, 16 = Teachers and Surgeons only, 5 = only Surgeons – none of these fit the condition.

Trick: "A and B but not C" → take the A∩B lens and drop the central (all-three) number.

Answer: (C) 29

Concept: Write the alphabet positions and check how each letter of a cluster moves to the next cluster.

1. 1st letters: M(13) → J(10) → G(7) → D(4) → ? : each time $-3$, so next = A(1).
2. 2nd letters: F(6) → C(3) → Z(26) → W(23) → ? : $-3$ each, so next = T(20).
3. 3rd letters: J(10) → G(7) → D(4) → A(1) → ? : $-3$, so next = X(24).
4. Required cluster = ATX.

Trick: All three letters fall by 3 – check only one letter of each option: the first letter must be A and the last must be X.

Answer: (C) ATX

Concept: Rearrange the digits in increasing order and then count positions from both ends.

1. Digits of 52178436 in ascending order: 1 2 3 4 5 6 7 8.
2. Third from the left = 3; third from the right = 6.
3. Sum $=3+6=9$.

Trick: The eight digits here are exactly 1–8, so the ascending number is simply 12345678 – no sorting effort needed.

Answer: (C) 9

Concept: Sort the digits in ascending order, then read the required positions.

1. Digits of 36857219 in ascending order: 1 2 3 5 6 7 8 9 (note: no 4).
2. Second from the left = 2; third from the right = 7.
3. Sum $=2+7=9$.

Trick: Write the sorted digits in a line and count from the right by pointing with a finger – most errors come from miscounting "third from the right".

Answer: (B) 9

Concept: Check every D in the series: the letter just before it must be a vowel (A, E, I, O, U) and the letter just after it must be a consonant.

1. Series: K D D U R V U D E C Q D V A D R D G D E D Z D J.
2. D's with a vowel before them: UDE (after it is E, a vowel – rejected), ADR (R is a consonant – accepted), EDZ (Z is a consonant – accepted).
3. All other D's have a consonant before them (K, D, Q, R, G, Z) – rejected.
4. Count = 2.

Trick: First underline the vowels (U, U, E, A, E) – only the D's right after a vowel need checking.

Answer: (B) Two

Concept: Find the shift applied to each letter of the first cluster to get the second cluster.

1. DIP → GLS: D+3 = G, I+3 = L, P+3 = S. BST → EVW: B+3 = E, S+3 = V, T+3 = W. Rule: every letter $+3$.
2. HKD → KNG: H+3 = K, K+3 = N, D+3 = G ✓.
3. TEL → VHP is (+2, +3, +4); CIG → FKJ is (+3, +2, +3); EHL → IFP is (+4, −2, +4) – none follow the rule.

Trick: Test only the first letter of each option for "+3": T→V (+2 ✗), H→K ✓, C→F ✓, E→I ✗; then check the second letter of the two survivors.

Answer: (B) HKD : KNG

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

1. S – D: S is the brother of D. D + F: D is the son of F. So S is also a son of F.
2. F ÷ H: F is the father of H. H × K: H is the wife of K, so H is female and K is her husband.
3. S and H are children of the same father F, so S is H's brother; H is K's wife.
4. Hence S is K's wife's brother.

Trick: Draw one generation line for all children of F (S, D, H); the person at the far end (K) is only connected by marriage, so the answer must contain "wife's".

Answer: (C) Wife's brother

Concept: Find the differences between consecutive terms; they often form a simple pattern.

1. $70-67=3$, $97-85=12$, $112-97=15$ → differences are multiples of 3: 3, 6, 9, 12, 15.
2. So ? $=70+6=76$, and check: $76+9=85$ ✓.

Trick: When the last two differences are 12 and 15, go backwards in steps of 3 (9, 6, 3) to fill the gap.

Answer: (C) 76

Concept: Apply the rule letter by letter: vowel → next letter, consonant → previous letter.

1. C U R R E N T → C−1 = B, U+1 = V, R−1 = Q, R−1 = Q, E+1 = F, N−1 = M, T−1 = S.
2. New group: B V Q Q F M S.
3. Third from the right: S (1st), M (2nd), F (3rd).

Trick: Only the vowels U and E move forward; every other letter steps back one – write the new letters directly under the word.

Answer: (C) F

Concept: Find one operation that links the three numbers of each given set.

1. (2, 7, 14): $2\times 7=14$. (3, 16, 48): $3\times 16=48$. Rule: third number = product of the first two.
2. (5, 3, 15): $5\times 3=15$ ✓.
3. (4, 6, 20): $24\ne 20$; (8, 6, 56): $48\ne 56$; (6, 7, 48): $42\ne 48$.

Trick: When the third number is clearly bigger, test multiplication of the first two before anything else.

Answer: (B) (5, 3, 15)