RRB NTPC CBT 1 2021 General Intelligence & Reasoning Questions with Solutions

Explanation

Tracing the family relations generation by generation from top to bottom: A is the father of B (generation 1 down). B is the father of C, making C the grandchild of A (generation 2 down). C and his wife F have a son D, making D the child of C (generation 3 down).

Since D is a male relative located three generations below A, D is the great-grandson of A.

Explanation

Combining the universal affirmative statements, 'All calendars are mice' and 'All mice are dogs', yields 'All calendars are dogs' via hypothetical syllogism. Therefore, Conclusion 1 logically follows. Furthermore, an 'All A are B' proposition converts to 'Some B are A', which means 'All calendars are dogs' directly implies 'Some dogs are calendars'. Thus, Conclusion 2 also logically follows.

Explanation

Cloth is the basic raw material used to manufacture a Shirt. Similarly, Wood is the basic raw material used to manufacture Furniture.

Explanation

Since R is the father of P and S is the mother of P, S and R are married to each other as the parents of the same child. Thus, S is the wife of R and R is the husband of S, making their relationship Wife and Husband.

Explanation

The given series follows a pattern where the difference between consecutive terms increases by 18 at each step:

41 − 14 = 27 86 − 41 = 45 (which is 27 + 18) ? − 86 = 63 (which is 45 + 18) 230 − ? = 81 (which is 63 + 18) 329 − 230 = 99 (which is 81 + 18)

Adding 63 to 86 gives 149.

Explanation

Assumption 1 is not implicit because stating that education is necessary to eradicate social evils does not guarantee a quick resolution or that education alone will solve every social evil. Extreme qualifiers such as quickly and all go beyond the scope of the statement. Assumption 2 is not implicit because advocating for education as a solution does not mean every uneducated person practices social evils.

Explanation

An umpire is the chief official responsible for enforcing the rules and making decisions during a cricket match. Similarly, a referee is the official who presides over a volleyball match to enforce rules and maintain fair play.

Explanation

The given sequence is an alternating series formed by combining two separate patterns:

The letters at odd positions (1st, 3rd, 5th, 7th, 9th) decrease by 2 positions in reverse alphabetical order: W (23) → U (21) → S (19) → Q (17) → O (15).

The letters at even positions (2nd, 4th, 6th, 8th, 10th) decrease by 1 position in reverse alphabetical order: G (7) → F (6) → E (5) → D (4) → C (3).

Explanation

Total number of students = Position from left + Position from right - 1

Substituting the given values: Total = 9 + 12 - 1 = 20

Since the same student is counted twice (once from the left end and once from the right end), subtracting 1 gives the exact count of students in the line.

Explanation

Steel is an alloy, which is a composite material created by mixing iron with carbon and other elements. Unlike pure chemical elements that consist of a single type of atom and appear on the periodic table, steel is a manufactured mixture.

Explanation

The 12-letter word is rearranged based on position shifting. Labeling the letter positions from 1 to 12, the original positions are mapped to the new order: (3, 4, 1, 2, 6, 5, 9, 10, 7, 8, 12, 11).

In TYPEWRITTERS: Positions 1-4 (TYPE) become positions 3, 4, 1, 2 (PETY). Positions 5-12 (WRITTERS) become positions 6, 5, 9, 10, 7, 8, 12, 11 (RWTEITSR).

Applying the same position sequence (3, 4, 1, 2, 6, 5, 9, 10, 7, 8, 12, 11) to BRAINSTORMER: Positions (3, 4, 1, 2) give AIBR. Positions (6, 5, 9, 10) give SNRM. Positions (7, 8, 12, 11) give TORE.

Combining the rearranged segments yields AIBRSNRMTORE.

Explanation

The pattern followed in the given set of calculations is: f(a, b) = (ab + 1) / (a - b)

Testing the operation with the given examples: For 7 and 3: (7 × 3 + 1) / (7 - 3) = (21 + 1) / 4 = 22 / 4 = 11 / 2 For 6 and 2: (6 × 2 + 1) / (6 - 2) = (12 + 1) / 4 = 13 / 4 For 5 and 3: (5 × 3 + 1) / (5 - 3) = (15 + 1) / 2 = 16 / 2 = 8

Applying the same rule to generic inputs a and b gives (ab + 1) / (a - b).

Explanation

C is the father of D, and A is C's brother. Since the brother of one's father is their paternal uncle, A is the paternal uncle of D.

Explanation

From Statement A, "All mobiles are watches", by immediate inference through subalternation, if a universal affirmative statement is true, its corresponding particular affirmative statement must also be true. Since all mobiles are watches, it logically guarantees that some mobiles are watches, so conclusion 1 follows. Statement B provides no relation that allows deriving that all mobiles are books, so conclusion 2 does not follow.

Explanation

Each letter in the code language is shifted forward by 3 positions in the English alphabetical sequence:

S (+3) = V, H (+3) = K, I (+3) = L, F (+3) = I, T (+3) = W L (+3) = O, I (+3) = L, F (+3) = I, T (+3) = W

Applying the same pattern to JOB: J (+3) = M O (+3) = R B (+3) = E

Explanation

Dialogue refers to a spoken conversation or exchange of words between people, whereas all the other terms denote vocal sounds produced by animals.

Explanation

Samiksha is Gita's daughter. A person's paternal aunt is defined as their father's sister. Since Gita is Samiksha's mother, Samiksha's father is Gita's husband. Consequently, Samiksha's paternal aunt, Anjali, is the sister of Gita's husband, which makes Anjali Gita's husband's sister.

Explanation

Each letter of the word is coded by replacing it with the next letter in the English alphabetical order (+1 shift):

H + 1 = I O + 1 = P N + 1 = O E + 1 = F S + 1 = T T + 1 = U

Applying the same logic to 'SISTER':

S + 1 = T I + 1 = J S + 1 = T T + 1 = U E + 1 = F R + 1 = S

Thus, 'SISTER' is coded as TJTUFS.

Explanation

Each letter is represented by the square of its position in the English alphabet:

F = 6 → 6² = 36 H = 8 → 8² = 64 B = 2 → 2² = 4 Combining these values gives 36644.

Applying the same pattern to DAG: D = 4 → 4² = 16 A = 1 → 1² = 1 G = 7 → 7² = 49 Combining these values gives 16149.

Explanation

The given pair represents a nutrient and the specific deficiency disease caused by its lack in the human body, as Vitamin D deficiency leads to Rickets. Similarly, Iron deficiency leads to Anemia.

Explanation

Each letter in the original word is shifted two positions backward in the alphabetical order (-2 pattern):

G - 2 = E O - 2 = M O - 2 = M F - 2 = D Y - 2 = W

Applying the same -2 pattern to EMMA:

E - 2 = C M - 2 = K M - 2 = K A - 2 = Y (wrapping around from A to Y)

Thus, EMMA is written as CKKY.

Explanation

The logic governing the given operation is: Result = (First number × Second number) + 5

Applying this rule to the first three equations: I. (9 × 3) + 5 = 27 + 5 = 32 II. (6 × 7) + 5 = 42 + 5 = 47 III. (13 × 3) + 5 = 39 + 5 = 44

For the fourth equation: (12 × 3) + 5 = 36 + 5 = 41

Explanation

The pattern followed in each column is: Third row = (First row + Second row) × 2

Checking Column 2: (3 + 7) × 2 = 10 × 2 = 20

Checking Column 3: (6 + 14) × 2 = 20 × 2 = 40

Applying the same pattern to Column 1: (5 + 11) × 2 = 16 × 2 = 32

Explanation

Gold is a precious metal and element, whereas the suits in a standard deck of playing cards are Spades, Hearts, Diamonds, and Clubs. Gold is not a card suit.

Explanation

Statement (i) confirms that sound is a topic taught by the teacher. Statement (iii) specifies that all topics taught by the teacher, except thermodynamics, are very comprehensible and interesting. Because sound is taught by the teacher and is not thermodynamics, it is necessarily taught in an interesting manner, making conclusion (i) logically follow. Statement (iii) implies thermodynamics is taught by the teacher, which contradicts conclusion (ii), and statement (ii) explicitly states that waves are not taught by the teacher, making conclusion (iii) false.

Explanation

The given statements establish that the set of snakes is entirely contained within the set of pizzas (Snakes ⊆ Pizza), and there are partial overlaps involving tea. However, no statement restricts the set of pizzas exclusively to snakes and tea. The premises allow for the existence of pizzas that are neither tea nor snake. Therefore, the universal claim that all pizzas must be either tea or snake cannot be logically concluded.

Explanation

When food is suspected to be contaminated with disease-causing bacteria, immediate measures must be taken to minimize health risks and prevent further harm. Seeking medical assistance ensures prompt health evaluation and timely intervention for students who consumed the contaminated food. Disposing of the remaining dinner prevents any further consumption or spread of infection. Preparing for exams is completely unrelated to addressing a health emergency.

Explanation

The pattern in the series is based on adding consecutive even numbers to each term:

4 + 2 = 6 6 + 4 = 10 10 + 6 = 16 16 + 8 = 24

Following this logic, the missing term is 24 + 10 = 34.

Verifying the remaining terms: 34 + 12 = 46 46 + 14 = 60

Explanation

Winter and Summer are antonyms representing opposite seasons. Similarly, Freeze and Melt are antonyms representing opposite physical state transitions caused by temperature changes.

Explanation

The pattern follows a constant addition/subtraction of 4 on the alphabetical positions of each letter:

The 1st letter increases by 4: A(1) → E(5) → I(9) → M(13) → Q(17). The 2nd letter decreases by 4: Z(26) → V(22) → R(18) → N(14) → J(10). The 3rd letter decreases by 4: Y(25) → U(21) → Q(17) → M(13) → I(9). The 4th letter increases by 4: B(2) → F(6) → J(10) → N(14) → R(18).

Explanation

The coding scheme pairs the letters symmetrically from the outer ends moving toward the center, applying mathematical operations (+, -, ×, ÷) sequentially to their alphabetical positions:

For JRDRCEBD: 1st and 8th letters: J(10) + D(4) = 14 2nd and 7th letters: R(18) - B(2) = 16 3rd and 6th letters: D(4) × E(5) = 20 4th and 5th letters: R(18) ÷ C(3) = 06

Applying the same logic to OZCTECHD: 1st and 8th letters: O(15) + D(4) = 19 2nd and 7th letters: Z(26) - H(8) = 18 3rd and 6th letters: C(3) × C(3) = 09 4th and 5th letters: T(20) ÷ E(5) = 04

This gives the final code as 19 18 09 04.

Explanation

In the pair 31:33, the number 33 is a composite number divisible by 3 and 11, whereas all other pairs consist of consecutive prime numbers (twin primes) with a difference of 2.

Explanation

The series represents the number of days in each consecutive month of a leap year combined with the first letter of that month's name. Starting from January (31 days, J) giving 31J, February (29 days, F) giving 29F, March (31 days, M) giving 31M, April (30 days, A) giving 30A, May (31 days, M) giving 31M, and June (30 days, J) giving 30J, the next month in order is July, which has 31 days and begins with the letter J.

Explanation

Conclusion I makes an absolute and extreme assumption about the exclusive use of electric vehicles, which cannot be logically deduced from the statement. Conclusion II directly follows because developing alternative fuel options is a necessary and practical measure to tackle the problem of fuel scarcity arising from the rapid depletion of petrol and diesel.

Explanation

The pattern in the given series alternates between multiplying the preceding number by 2 and subtracting 3, and multiplying by 2 and adding 3:

3 × 2 - 3 = 3 3 × 2 + 3 = 9 9 × 2 - 3 = 15 15 × 2 + 3 = 33 33 × 2 - 3 = 63 63 × 2 + 3 = 129 129 × 2 - 3 = 255 255 × 2 + 3 = 513 513 × 2 - 3 = 1023

Following this logic, the missing term is 33 × 2 - 3 = 63.

Explanation

The pattern followed in the given sets is that the middle number is the square of the difference between the first and third numbers: Middle Number = (First Number - Third Number)².

(16 - 3)² = 13² = 169 (18 - 7)² = 11² = 121 (21 - 2)² = 19² = 361 (6 - 4)² = 2² = 4

Applying the same rule: (13 - 9)² = 4² = 16

Explanation

Numbering the five positions 1 to 5 from left to right:

Maths is white and cannot be at position 2 or 4. Since the extreme positions 1 and 5 are occupied by Chemistry and the yellow book, Maths (White) must be at position 3.

Biology has a black cover, so it cannot be yellow. Placing Chemistry with a blue cover at position 1 means Biology (Black) is at position 4 to maintain a two-book separation between blue and Biology. Position 5 is then occupied by the yellow book (History).

Since the red Physics book is adjacent to the blue book at position 1, Physics (Red) must be at position 2. This creates the valid stack: 1: Chemistry (Blue), 2: Physics (Red), 3: Maths (White), 4: Biology (Black), 5: History (Yellow).

Explanation

The pattern alternates between two rules based on letter positions: letters at odd positions are replaced by their reverse alphabetical opposites (where the sum of positional values is 27), while letters at even positions are shifted forward by +1.

Applying this rule to EXTREME: Position 1 (E, 5): 27 - 5 = 22 (V) Position 2 (X, 24): 24 + 1 = 25 (Y) Position 3 (T, 20): 27 - 20 = 7 (G) Position 4 (R, 18): 18 + 1 = 19 (S) Position 5 (E, 5): 27 - 5 = 22 (V) Position 6 (M, 13): 13 + 1 = 14 (N) Position 7 (E, 5): 27 - 5 = 22 (V)

Combining these positions in order yields VYGSVNV.

Explanation

The series follows a pattern where each number is obtained by dividing the preceding term by consecutive decreasing integers starting from 6:

5040 ÷ 6 = 840 840 ÷ 5 = 168 168 ÷ 4 = 42 42 ÷ 3 = 14 14 ÷ 2 = 7

Explanation

Each letter in the word is shifted forward by 4 positions in the alphabetical series:

B (+4) = F, R (+4) = V, I (+4) = M, D (+4) = H, E (+4) = I

Applying the same rule to SINGLE:

S (+4) = W I (+4) = M N (+4) = R G (+4) = K L (+4) = P E (+4) = I

Explanation

Man refers to a specific biological species (Homo sapiens), whereas the others are broad taxonomic classes of vertebrates (Reptilia, Mammalia, and Aves).

Explanation

Reading newspapers helps individuals stay informed about daily national and international events, thereby raising general awareness and making citizens well-informed. Argument I directly highlights this fundamental purpose of newspaper reading, providing a strong and logically sound reason that applies to everyone. Argument II relies on the false premise that newspaper reading is useful only for competitive exams, ignoring its broader educational and social benefits for the general public.

Explanation

Arranging the five people facing the centre around the circular table in clockwise order yields: Anoop → Vijay → Saroj → Pawan → Rita → Anoop.

In this circular arrangement, Pawan is placed two positions to the right of Anoop and immediately to the left of Saroj. Rita sits immediately to the left of Pawan, which leaves Vijay in the position between Saroj and Anoop. Facing the centre, the person sitting immediately to Vijay's right (in the counter-clockwise direction) is Anoop.

Explanation

The pattern followed by the given sets is (x³, y², x + y), where the first number is a perfect cube, the second number is a perfect square, and the third number is the sum of their respective bases.

In the given sets: 343 = 7³ and 36 = 6² → 7 + 6 = 13 64 = 4³ and 16 = 4² → 4 + 4 = 8 27 = 3³ and 25 = 5² → 3 + 5 = 8

Applying the same pattern: 216 = 6³ 64 = 8² 6 + 8 = 14

Explanation

Combining the statements "Some questions are answers" and "All answers are paragraphs" using the standard syllogism rule (I + A = I) directly yields "Some questions are paragraphs", making conclusion 2 logically valid. Conclusion 1 does not follow because linking "Some questions are paragraphs" with "Some paragraphs are essay" attempts to combine two particular (I-type) statements, from which no definite relationship between questions and essays can be established.

Explanation

Rohan is married to Sunita as he wants to divorce her. Since Sunita and Sujata are sisters and Sujata is the daughter of Hari Chand, Sunita is also Hari Chand's daughter. Hari Chand is therefore the father of Rohan's wife, which makes him Rohan's father-in-law.

Explanation

From statements 1 and 2, since all doctors are engineers and no engineer is an advocate, no doctor can be an advocate. By conversion, no advocate is a doctor (Conclusion B).

From statement 3, the premise that some advocates are teachers directly converts to the conclusion that some teachers are advocates (Conclusion C).

Explanation

When a person provides a layout map of hotel amenities to an arriving guest, they do so under the assumption that the guest may wish to locate and use those facilities. Information regarding the doorman's personal financial compensation or commission structure is entirely outside the scope of the statement and cannot be assumed.

Explanation

Arranging the eight positions around the rectangular table (four corners, two shorter sides, and two longer sides) facing away from the center:

Place G on one shorter side. Since everyone faces outward, moving clockwise corresponds to the left. Counting three positions clockwise from G places H at a corner. Counting three positions counterclockwise from G places A at the opposite corner, leaving two persons between A and G.

Placing B on the top longer side with its neighbour E at the adjacent corner forces C to occupy the remaining corner. To satisfy the condition that B sits to the left of D, D must be positioned on the opposite shorter side.

Thus, D sits directly opposite G on the rectangular table.

Explanation

In cricket, a slip is a fielding position located behind the wicket on the off side to catch edges, whereas the other terms are all types of batting shots.