RRB NTPC Undergraduate CBT 1 2024 PYQs

Concept: Replace each symbol by its meaning, then apply BODMAS.

1. $9-3\times 756+84÷3$ becomes $9÷3+756-84\times 3$.
2. $=3+756-252$.
3. $=507$.

Trick: Write the substituted expression fully before solving — the mistake usually happens in substitution.

Answer: (D) 507

Concept: Plot each move with A at the origin: east is +x, north is +y.

1. 6 km east → (6, 0). Left (north) 4 → (6, 4).
2. Left (west) 9 → (−3, 4). Left (south) 7 → (−3, −3).
3. Left (east) 3 → (0, −3) = P.
4. P is 3 km directly south of A → drive 3 km to the north.

Trick: Net: East $6-9+3=0$, North $4-7=-3$ → P is 3 km south of A.

Answer: (C) 3 km to the north

Concept: Codes may be jumbled; the letter common to both words takes the digit common to both codes.

1. GLUE → 4627 and LOAD → 1375.
2. Common letter: L. Common digit: 7.
3. So L = 7.

Trick: Common letter ↔ common digit — no need to decode the rest.

Answer: (B) 7

Concept: Check gaps between consecutive letters (counting cyclically).

1. GC-OK: G −4 C, C +12 O, O −4 K.
2. HD-PL: −4, +12, −4; NJ-VR: −4, +12, −4.
3. TP-AX: T −4 P, but P → A is +11 and A → X is −3 → odd.

Trick: Compare the first letters of the two clusters: G→O, H→P, N→V are all +8; T→A is +7.

Answer: (A) TP-AX

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

1. DEAR → 4627 and TURN → 1375.
2. Common letter: R. Common digit: 7.
3. So R = 7.

Trick: Common letter ↔ common digit.

Answer: (B) 7

Concept: Number positions from the bottom (1) to the top (7).

1. Only three below G → G at 4. Two between G and B → B at 1 or 7.
2. Only A above F → A 7, F 6; so B at 1.
3. D above E above C in 2, 3, 5 → C 2, E 3, D 5.
4. Above E: G, D, F, A → 4 boxes.

Trick: 'Only A is above F' fills the top two places at once.

Answer: (B) 4

Concept: Facing north; number seats 1 (left) to 7 (right).

1. Only D to the right of A → A 6, D 7.
2. One between R and A → R 4. Two between Q and R → Q 1.
3. P, B, C in 2, 3, 5 with P left of B left of C → P 2, B 3, C 5.
4. Between P (2) and C (5): B, R → two people.

Trick: People between seats $x$ and $y$ $=|x-y|-1=5-2-1=2$.

Answer: (D) Two

Concept: Draw a family tree: generations vertically, siblings on one line.

1. X is the father of D; D (female) is the mother of G.
2. G, I and E are siblings (G brother of I, I sister of E), so D is E's mother.
3. X is the father of E's mother → mother's father (maternal grandfather).

Trick: Husband's father would need E to be married to D's son — but D is E's mother, so it is a blood link.

Answer: (B) Mother's father

Concept: Change every digit as per its odd/even nature, then pick positions.

1. 2736158: 2→1, 7→9, 3→5, 6→5, 1→3, 5→7, 8→7 → 1955377.
2. 3rd from left = 5; 3rd from right = 3.
3. Sum $=5+3=8$.

Trick: In a 7-digit number, 3rd from left and 3rd from right are the 3rd and 5th digits — change only those: $3\to 5$, $1\to 3$.

Answer: (B) 8

Concept: Look at the differences between consecutive terms.

1. Differences: $42-31=11$, $57-42=15$, $76-57=19$, $99-76=23$.
2. Differences increase by 4 → next difference 27.
3. $99+27=126$.

Trick: Second differences constant (4) → keep adding 4 to the gap.

Answer: (A) 126

Concept: Fix the definite positions first (ends and counts), then place the pairs.

1. No one left of V ⇒ V at position 1; four between V and I ⇒ I at 6.
2. Three to the right of K ⇒ K at 4.
3. J immediately left of W: only free pair is 2-3 ⇒ J2, W3.
4. L not next to K (4) ⇒ L at 7, U at 5.

Trick: In a 7-seat row, 'n people to the right' ⇒ position $7-n$.

Answer: (A) L

Concept: Check every number: the element just before it and just after it must both be symbols.

1. Series: 7 1 $ % 3 $ % 8 < 7 8 1 8 # < 7 @ * 5 5 +
2. % 3 $ ✓ ; % 8 < ✓ ; < 7 @ ✓
3. < 7 8 ✗ ; * 5 5 ✗ ; other numbers have a number beside them.
4. Such numbers: 3, 8, 7 ⇒ Three

Trick: Scan only the numbers and look at both neighbours.

Answer: (D) Three

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

1. Total $=27+34-1=60$

Yaad rakhein: Subtract 1 because the person is counted twice.

Answer: (B) 60

Concept: Common letters get common digits; the leftover letter takes the leftover digit.

1. MORE → 1432, MOVE → 3254
2. Common letters M, O, E ↔ common digits 2, 3, 4
3. R → 1 (left in first), V → 5 (left in second)

Trick: Eliminate common letters/digits, compare the remainders.

Answer: (B) 5

Concept: Draw nested circles: Kiwis inside Bananas inside Grapes.

1. All kiwis are bananas and all bananas are grapes ⇒ all kiwis are grapes. (I) follows.
2. All bananas are grapes ⇒ some grapes are bananas (conversion). (II) follows.

Yaad rakhein: 'All A are B' always gives 'Some B are A'.

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

Concept: Start from the definite clue 'only M to the right of K'.

1. K at 6, M at 7.
2. One person between I and K ⇒ I at 4.
3. Two between J and I ⇒ J at 1 (7 is taken).
4. L, O, N in 2, 3, 5 with L left of O left of N ⇒ L2, O3, N5.
5. Between N(5) and L(2): O, I ⇒ Two

Trick: Seats between positions $p$ and $q$ $=|p-q|-1=5-2-1=2$.

Answer: (A) Two

Concept: Build the family tree from S downwards.

1. T is the daughter of S and A is T's brother ⇒ A is S's son.
2. O is A's wife ⇒ O is S's son's wife.
3. B is O's father ⇒ B is S's son's wife's father.

Trick: Trace the path S → A → O → B and read each link.

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

Concept: Round each value to the nearest convenient number, then follow BODMAS.

1. $\sqrt[3]{63.998}\approx \sqrt[3]{64}=4$
2. $\frac{5}{4}$ of $120\%$ of $400=\frac{5}{4}\times 480=600$
3. $29.99÷3.01\approx 30÷3=10$
4. $?\approx 4+600-10=594$

Trick: 'of' is multiplication; do it before $+$ and $-$.

Answer: (B) 594

Concept: Find the shift of each letter in the given pairs.

1. X→B, A→E, Y→C, A→E: each $+4$
2. G→K, J→N, H→L, J→N: each $+4$
3. M+4=Q, P+4=T, N+4=R, P+4=T ⇒ QTRT

Trick: Repeated letter (P, P) must give repeated letter (T, T).

Answer: (D) QTRT

Concept: Track net east-west and north-south displacement from A.

1. West 9, left → South 3, right → West 11, right → North 4, right → East 20.
2. East-West: $-9-11+20=0$
3. North-South: $-3+4=+1$ ⇒ P is 1 km north of A.
4. To return: 1 km towards south.

Trick: Left from West = South; right from South = West.

Answer: (A) 1 km to the south