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

Explanation

By combining the two universal affirmative statements, "All teachers are doctors" and "All doctors are students", the standard syllogistic rules (All A are B + All B are C = All A are C) give "All teachers are students". Thus, conclusion I logically follows.

For conclusion II, "All doctors are students" converts logically only to "Some students are doctors". A universal statement of the form "All A are B" does not imply "All B are A", so conclusion II does not follow.

Explanation

Monitoring someone's expenditure pattern to check a habit of splurging indicates care and concern for their financial well-being, which logically implies that the speaker is a well-wisher. Splurging means spending lavishly or extravagantly, which does not inherently mean spending beyond one's means. Furthermore, the specific identity of the speaker as a parent cannot be deduced from the statement, as the speaker could be a spouse, guardian, or friend.

Explanation

The relationship is determined by applying positional shifts to the letters in the English alphabet:

First letter: +1 shift → H (8) + 1 = 9 (I) Second letter: -2 shift → M (13) - 2 = 11 (K) Third letter: +3 shift → R (18) + 3 = 21 (U) Fourth letter: -4 shift → W (23) - 4 = 19 (S)

Applying this positional shift pattern to HMRW yields IKUS.

Explanation

The relationship among the numbers in the group is defined by the rule: Third number = (First number × Second number) + 5

For the given set (15, 7, 110): (15 × 7) + 5 = 105 + 5 = 110

Applying the same rule: (18 × 5) + 5 = 90 + 5 = 95

Explanation

Let the person in the photo be P.

The paternal uncle of P's daughter is P's brother. His wife is the girl's mother, which means the girl is the daughter of P's brother.

The mother of the person in the photo is also the mother of P's brother. Since the girl is the daughter of P's brother (who is a son to P's mother), the girl is the son's daughter of the mother of the person in the photo.

Explanation

The positions from 1st (leading) to 5th (slowest) can be determined step by step:

Since A is the slowest person, A is in 5th position. B drives a white car and needs to pass one person to reach 2nd position, which places B in 3rd position. C is immediately behind D, filling 1st and 2nd positions as D and C respectively. This leaves E in 4th position.

The red car is directly behind E, so A in 5th position drives the red car. Since the person in 4th position (E) does not drive the black car, E drives the yellow car in 4th position.

Explanation

The 10-letter word is divided into three sections: the first 4 letters, the middle 2 letters, and the last 4 letters. The code is constructed by placing the last 4 letters first, followed by the reversed middle 2 letters, and lastly the first 4 letters.

For APPENDICES: First 4 letters: APPE Middle 2 letters: ND (reversed to DN) Last 4 letters: ICES

Arranging them according to the pattern (Last 4 + Reversed Middle 2 + First 4) yields ICES + DN + APPE = ICESDNAPPE.

Explanation

In an eight-person row numbered 1 to 8 from left to right:

E is fifth from the left, so E is at position 5. A is fifth from the right, so A is at position 4. A is between C and E, placing C at position 3. There are three persons between A and D, placing D at position 8. There are two persons between E and G, placing G at position 2. B is adjacent to D, placing B at position 7. H is at one end and not next to D, placing H at position 1. F occupies the remaining position 6.

The final seating order from left to right is H, G, C, A, E, F, B, D.

The person sitting fourth to the right of C (position 3) is at position 3 + 4 = 7, which is B. The person sitting third to the left of position 7 is at position 7 - 3 = 4, who is A.

Explanation

The given series breaks down into three distinct patterns:

First number: The difference between consecutive numbers increases by 2 each time (+7, +9, +11, +13). The next difference is +15, giving 47 + 15 = 62 (and subsequently 62 + 17 = 79).

Middle letter: The letters decrease backwards alphabetically by one position (Y, X, W, V, U, T, S). The letter following U is T.

Last number: The numbers increase by 2 each time (7, 9, 11, 13, 15, 17, 19). The number following 15 is 17.

Combining these three elements yields 62T17.

Explanation

Argument I is strong because the fundamental objective of an examination is to evaluate a candidate's knowledge fairly, and electronic gadgets can easily be used to cheat, which directly compromises the integrity and fairness of the test.

Argument II is weak because personal safety or the expense of belongings is a logistical concern that does not outweigh the core purpose and security requirements of an academic examination.

Explanation

Each letter is coded by its reverse alphabetical position, calculated as 27 minus its standard position in the English alphabet (A = 26, B = 25, ..., Z = 1).

Calculating for each letter in AUTHENTIC: A = 27 - 1 = 26 U = 27 - 21 = 6 T = 27 - 20 = 7 H = 27 - 8 = 19 E = 27 - 5 = 22 N = 27 - 14 = 13 T = 27 - 20 = 7 I = 27 - 9 = 18 C = 27 - 3 = 24

Concatenating these values in order gives 266719221371824.

Explanation

The logic follows the pattern where the second number in each pair is obtained by multiplying the first number by the sum of its digits:

15 × (1 + 5) = 15 × 6 = 90 203 × (2 + 0 + 3) = 203 × 5 = 1015 16 × (1 + 6) = 16 × 7 = 112

Explanation

The pattern follows taking the opposite letter (whose positional values sum to 27) for each character in reverse order.

For YLP: opposite of P is K, opposite of L is O, opposite of Y is B, giving KOB.

For BUS: opposite of S is H, opposite of U is F, opposite of B is Y, giving HFY.

Applying the same logic to RAN: opposite of N is M, opposite of A is Z, opposite of R is I, giving MZI.

Explanation

The given series follows a double-difference pattern where the differences between consecutive terms increase by consecutive integers.

First level of differences: 7 - 5 = 2 10 - 7 = 3 15 - 10 = 5 23 - 15 = 8 35 - 23 = 12 52 - 35 = 17

Second level of differences: 3 - 2 = 1 5 - 3 = 2 8 - 5 = 3 12 - 8 = 4 17 - 12 = 5

Following this sequence, the next second difference is 6. Adding 6 to the previous first difference (17) gives 23. Adding 23 to 52 gives 75.

Explanation

The six persons are seated in two parallel rows of three facing each other, one row facing North and the other facing South:

Since C and L are on the same side and both occupy extreme end positions, they sit at the two ends of one row, leaving the middle seat of that row for either A or B. K occupies the middle seat in the opposite row. Since K is to the immediate right of M, M sits at one end of K's row. A is not opposite K, so A must occupy the remaining end seat in K's row (opposite C), which leaves B to occupy the middle seat opposite K. Since A cannot be opposite L, L sits opposite M at one end, B sits in the middle, and C sits at the other end opposite A. In this arrangement, relative to B's facing direction, L is positioned on B's right side. Therefore, L is sitting adjacent to B on the right side.

Explanation

The series follows a term-by-term pattern for each component:

The first letter advances by 2 steps in alphabetical order: C (+2) → E (+2) → G (+2) → I (+2) → K. The second letter moves backward by 2 steps: X (-2) → V (-2) → T (-2) → R (-2) → P. The third letter advances by 2 steps: M (+2) → O (+2) → Q (+2) → S (+2) → U. The trailing number decreases by 2: 9 (-2) → 7 (-2) → 5 (-2) → 3 (-2) → 1.

Combining all four components gives KPU1.

Explanation

From the given statements, the set of mirrors is completely inside the set of lenses, while the set of sunglasses has no overlap with mirrors. However, the relationship between sunglasses and lenses is left entirely unspecified. Sunglasses may lie completely outside the set of lenses, partially overlap with it, or lie entirely within it.

Since a logical conclusion must hold true in all possible Venn diagram representations, neither "All sunglasses are lenses" nor "Some sunglasses are lenses" can be definitively concluded.

Explanation

In the given pattern, the numerical position of the second letter is obtained by multiplying the digits of the numerical position of the first letter. N is the 14th letter of the alphabet, and the product of its digits is 1 × 4 = 4, which corresponds to D instead of E.

Explanation

In this pair, trajectory refers to the flight path followed by an object rather than a profession, trade, or field of work. In the other pairs, the first word is a specialized instrument or tool, and the second word represents the specific domain, craft, or activity in which that tool is used.

Explanation

An assumption is an underlying premise that must hold true for a statement to make sense. The given statement calls for strict government measures to prevent tax evasion in general. It does not assume any factual distribution regarding honest taxpayers who deposit taxes on time, nor does it assume or target any specific demographic, such as high-income earners, as the primary evaders. Because neither assertion is a necessary premise for calling for strict anti-evasion measures, neither assumption is implicit.

Explanation

To convert 7.17 hours into hours, minutes, and seconds:

The whole number represents 7 hours.

Convert the fractional part (0.17 hours) into minutes by multiplying by 60: 0.17 × 60 = 10.2 minutes

The whole number part gives 10 minutes.

Convert the remaining fractional minute (0.2 minutes) into seconds by multiplying by 60: 0.2 × 60 = 12 seconds

Combining all parts yields 7 hours, 10 minutes, 12 seconds.

Explanation

Let the 6 positions around the circular table facing the center be numbered 1 to 6 in clockwise order. On a circular table facing the center, clockwise corresponds to left and counter-clockwise corresponds to right.

Placing C at position 1, B is to its immediate right (counter-clockwise) at position 6. Since C is not an immediate neighbour of A, A cannot be at position 2.

Exchanging E and F puts E two positions to the left of A (clockwise), meaning F originally sat two positions to the left of A. Setting A at position 3 places F at position 5.

Since D is an immediate neighbour of F and position 6 is occupied by B, D must be at position 4. The remaining position 2 is occupied by E.

The initial clockwise arrangement is C at 1, E at 2, A at 3, D at 4, F at 5, and B at 6.

When D and E exchange positions, D moves to position 2 and E moves to position 4. Moving two positions to the left (clockwise) from B at position 6 leads to position 2, which is now occupied by D.

Explanation

343 is a perfect cube (7³ = 343), whereas all other numbers in the set are perfect squares (15² = 225, 21² = 441, 31² = 961, and 35² = 1225).

Explanation

The coding pattern calculates the sum of the alphabetical positions of all letters in the word, then adds the digits of the resulting number to get the final code.

For PEN: P = 16, E = 5, N = 14 Sum of positions = 16 + 5 + 14 = 35 Sum of digits = 3 + 5 = 8

For PENCIL: P = 16, E = 5, N = 14, C = 3, I = 9, L = 12 Sum of positions = 16 + 5 + 14 + 3 + 9 + 12 = 59 Sum of digits = 5 + 9 = 14

Explanation

Comparing 'Man is mortal' (+ ga lp) and 'James is Man' (lp ga ku), the common words are 'Man' and 'is', corresponding to the common codes 'ga' and 'lp'.

Comparing all three statements, the word 'is' appears in every sentence, and the code 'lp' appears in every coded expression. Therefore, 'is' corresponds to 'lp'.

Since 'is' is 'lp', the remaining common word 'Man' in the first two statements corresponds to 'ga'. Similarly, comparing 'James is Man' (lp ga ku) and 'James is mortal' (ku + lp), the remaining common word 'James' corresponds to 'ku'.

Therefore, the code for 'Man James' is 'ga ku'.

Explanation

Glass is an item of drinkware or tableware used for drinking liquids, categorizing it as kitchenware rather than furniture.

Explanation

Cat is a carnivorous mammal belonging to the family Felidae, primarily kept as a domestic pet. In contrast, goat, cow, and buffalo are herbivorous ruminant livestock belonging to the order Artiodactyla, specifically raised for milk production, meat, and agricultural labor.

Explanation

The coding scheme involves reversing the order of the letters in the word and then advancing each letter by 4 positions in the alphabetical sequence (+4).

Reversing DKVCTR gives RTCVKD. Shifting each letter forward by 4 positions gives: R + 4 = V, T + 4 = X, C + 4 = G, V + 4 = Z, K + 4 = O, D + 4 = H, resulting in VXGZOH.

Applying the same logic to FRSTYD: Reversing the word gives DYTSRF. Shifting each letter forward by 4 positions: D + 4 = H, Y + 4 = C, T + 4 = X, S + 4 = W, R + 4 = V, F + 4 = J.

This yields the coded word HCXWVJ.

Explanation

Conversion of the statement "All pink are pigs" directly gives "Some pigs are pink", which validates Conclusion II. Combining "Some roses are pink" and "All pink are pigs" yields "Some roses are pigs", which on conversion gives "Some pigs are roses", validating Conclusion III. Conclusions I and IV cannot be definitely established as there is no universal connection linking birds directly with pink or roses.

Explanation

Comparing 'BDT' (girls play toy) and 'BTC' (girls like toy), the common letters 'B' and 'T' correspond to the common words 'girls' and 'toy'. In 'BTC', the remaining letter 'C' corresponds to the remaining word 'like'.

Explanation

A garden is a designated place where various types of plants are kept, cultivated, and displayed. In the same way, a zoo is a designated place where various types of animals are kept, cared for, and exhibited.

Explanation

Arranging the words alphabetically by comparing their letters from left to right: Excuse comes first because its third letter c appears earliest in the alphabet. Between Exempt and Exercise, both share the prefix Exe, but the fourth letter m in Exempt precedes r in Exercise, placing Exempt second in the sequence, followed by Exercise third and Exit fourth.

Explanation

M is married to T, and together they have three children: N, O, and P. Since O is the only daughter of M, N and P are both sons, with N being a doctor.

P is married to R, and they have a daughter named U. Since there are three married couples in the family, the third married couple must consist of N and Q. Q is the mother of S, who is the grandchild of M and T.

Therefore, Q is the wife of the doctor N.

Explanation

Replacing the original operators with their corresponding operations: becomes + / becomes - becomes ÷

• becomes ×

The given expression converts to: 22 + 10 - 10 ÷ 2 × 4

Applying the BODMAS rule: Division: 10 ÷ 2 = 5 Multiplication: 5 × 4 = 20 Addition: 22 + 10 = 32 Subtraction: 32 - 20 = 12

Explanation

Each letter in the pattern is replaced by its reverse alphabetical counterpart, where the sum of the position numbers from the start and end of the alphabet equals 27.

A (1) pairs with Z (26), D (4) pairs with W (23), and G (7) pairs with T (20).

Applying the same rule to BEH gives B (2) pairing with Y (25), E (5) pairing with V (22), and H (8) pairing with S (19), yielding YVS.

Explanation

The pattern follows taking the sum of the positional values of each letter in the English alphabet and squaring the total.

For SHANU: S(19) + H(8) + A(1) + N(14) + U(21) = 63 63² = 3969

Similarly, for TAPLG: T(20) + A(1) + P(16) + L(12) + G(7) = 56 56² = 3136

Explanation

Among the given numbers, 39 is a composite number because it has factors other than 1 and itself (39 = 3 × 13), whereas 67, 41, and 17 are all prime numbers.

Explanation

From Statement c, "No inkjet is a laser", which converts to "No laser is an inkjet". In standard categorical logic, a universal negative statement ("No A is B") implies its particular negative form ("Some A are not B"). Thus, if no laser is an inkjet, it logically follows that "Some laser are not inkjet". Therefore, Conclusion iii is definitely true.

Explanation

Numbering the six positions from left to right as 1 to 6:

Since Tara sits at one of the ends and Sara is 4th to the right of Tara, Tara is at position 1 and Sara is at position 5.

Kiara sits to the immediate left of Amaira, and Amaira is 2nd to the left of Maira. Placing Kiara at position 3 and Amaira at position 4 puts Maira at position 6.

Zara occupies position 2.

The final sitting order from left to right is Tara at position 1, Zara at position 2, Kiara at position 3, Amaira at position 4, Sara at position 5, and Maira at position 6.

Explanation

Since Malti is the mother of Ashu and Jyoti, and Abhishek is the brother of Ashu, Abhishek, Ashu, and Jyoti are all siblings. Swati is the daughter of Jyoti, which makes Jyoti the mother of Swati. Consequently, Abhishek is the brother of Swati's mother (Jyoti), making him her Mother's Brother.

Explanation

Argument 1 is strong because child psychology and educational studies consistently show that learning foundational concepts in one's native language enhances comprehension, retention, and cognitive development during early childhood. Argument 2 is weak because the unavailability of private tuition teachers is a minor, peripheral issue that does not outweigh the pedagogical benefits of mother-tongue instruction, nor should public educational policy rely on the private tuition ecosystem.

Explanation

B and D are unemployed, and A is the child in the family, so A, B, and D do not hold any of the three professions. This leaves C, E, and F for the three roles of teacher, business person, and accountant. Since C is the wife of E, C is female. The given information specifies that no ladies are in business or accountancy. Therefore, C cannot be a business person or an accountant, which means C must be the teacher.

Explanation

The pattern in the series is based on adding consecutive multiples of 3 to each term: 12 + 3 = 15 15 + 6 = 21 21 + 9 = 30 30 + 12 = 42 42 + 15 = 57

Following this sequence of differences (3, 6, 9, 12, 15), the next value to add is 18: 57 + 18 = 75

Explanation

The relationship is determined by finding two factors whose product equals the given number and then calculating their sum.

For the first pair, 15 is equal to 3 × 5, and the sum of these two factors is 3 + 5 = 8.

Applying the same pattern to 25, it is equal to 5 × 5, and the sum of these factors is 5 + 5 = 10.

Explanation

C is the son of A, and B is the mother of C, which makes B the mother of C, D, and E. Since D is the son of B, and F is the son of D, B is the mother of F's father (D). Therefore, B is F's father's mother.

Explanation

The pattern followed in the given analogy shifts the positional values of the letters by -2, +1, and +2 respectively:

R - 2 = P, A + 1 = B, M + 2 = O

Applying the same logic to SPQ:

S - 2 = Q P + 1 = Q Q + 2 = S

Explanation

The series follows a consistent pattern across all three components of each term:

The first letter moves forward by 2 positions in alphabetical order: B (+2) → D (+2) → F (+2) → H.

The middle number increases by 4 in each term: 7 (+4) → 11 (+4) → 15 (+4) → 19.

The third letter moves forward by 2 positions in alphabetical order: E (+2) → G (+2) → I (+2) → K.

Combining these components yields H19K.

Explanation

Students are the learners who attend an educational institution to receive instruction, whereas the remaining terms denote administrative and executive leadership roles responsible for managing, governing, and supervising an institution.

Explanation

A refrigerator is a household appliance specifically designed to create or maintain a cold environment. Similarly, an oven is a household appliance specifically designed to create or maintain a hot environment. Both pairs follow the relationship of a temperature state to the appliance that produces or maintains it.

Explanation

An author uses a pen as a primary tool to perform their work. Similarly, a surgeon uses a scalpel as a primary tool to perform surgical operations.