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

Explanation

The word ALIGATOR is divided into four two-letter pairs: (A L), (I G), (A T), and (O R). Reversing each pair gives LA, GI, TA, and RO. Rearranging these reversed pairs in the order of 1st, 4th, 2nd, and 3rd pair yields LAROGITA.

Applying the exact same rule to COMPUTER: Pairs: (C O), (M P), (U T), (E R) Reversed pairs: OC, PM, TU, RE Arranged in 1st, 4th, 2nd, 3rd sequence: OC + RE + PM + TU = OCREPMTU.

Explanation

In the pair 15, 30, the two numbers are not co-prime as their highest common factor (HCF) is 15, and 30 is a direct multiple of 15 (15 × 2 = 30). Additionally, the difference between the numbers (30 - 15 = 15) is a composite number. In contrast, all other pairs consist of co-prime numbers with an HCF of 1 whose difference yields a prime number.

Explanation

The pattern follows a positional shifting rule where letters at odd positions (1st, 3rd, 5th) remain unchanged, while letters at even positions (2nd, 4th) are shifted forward by 3 steps in the English alphabetical order.

Applying this pattern to SPICY: S (1st) remains unchanged -> S P (2nd) + 3 steps -> S I (3rd) remains unchanged -> I C (4th) + 3 steps -> F Y (5th) remains unchanged -> Y

Combining these gives SSIFY.

Explanation

By the rule of immediate inference, Statement 1 ("Some chairs are tables") directly converts to "Some tables are chairs", which makes Conclusion 2 valid. For Conclusion 1, the middle term "tables" is undistributed in both premises, so no definite relationship can be established between "books" and "chairs". Therefore, only Conclusion 2 logically follows.

Explanation

A sari is a garment worn as clothing on the body, whereas the other items are bedding accessories used on a bed.

Explanation

When both given premises are negative statements ("No door is window" and "No window is table"), no definite relation can be logically derived between the middle terms (doors and tables).

A valid Venn diagram arrangement allows the set of tables to be completely inside the set of doors while keeping windows separate from both, which makes the statement "All tables are doors" possible. This invalidates Conclusion I. Similarly, doors and tables can overlap without violating any of the given statements, which invalidates Conclusion II. Therefore, neither conclusion logically follows.

Explanation

Number eight positions clockwise around the table as 1 to 8. Placing G at position 1, C sits third to its right at position 6.

The neighbours of G and C are positions 2, 5, 7, and 8. Since A and B cannot sit next to C or G, they must occupy positions 3 and 4.

D is third to the left of A. If A were at position 3, third to its left would be position 6, which is already occupied by C. Therefore, A is at position 4 and B is at position 3, placing D third to the left of A at position 7.

Since two persons sit between D (position 7) and E, E must sit at position 2. F is second to the right of E, placing F at position 8. This leaves position 5 for H.

Facing the centre, the immediate left of A at position 4 is position 5, where H is seated.

Explanation

In the word pairs Run : Walk, Cut : Scratch, and Punch : Tap, the first word represents a more forceful or intense version of the action indicated by the second word. In Touch : Push, this relationship is reversed, as Touch is the milder action while Push involves greater force.

Explanation

Advertising serves to inform a broader target audience about a company's offerings, creating widespread product awareness that can lead to increased sales. This assumption directly underlies why advertising is considered an effective strategy to boost business growth. However, assuming that every single person who becomes aware of a product will purchase it is an unrealistic generalization, as awareness only increases the potential customer base rather than guaranteeing total conversion.

Explanation

Anil belongs to Subhash house as stated in the given information. Since only Danish and Farooq are tall, all other students including Anil are short. Furthermore, Anil is explicitly named among those who wear glasses. Thus, Anil meets all three conditions: belonging to Subhash house, being short, and wearing glasses.

Explanation

Positions from top (1) to bottom (6) are determined as follows:

Since B is above D with three bags between them, their positions can be (1, 5) or (2, 6). Since D is not kept below F, F must be placed below D, forcing D to be at position 5, F at position 6, and B at position 1.

With F at position 6 and two bags between A and F, A is placed at position 3. Since A is below C but above E, C takes position 2 and E takes position 4.

The initial top-to-bottom arrangement is B, C, A, E, D, F.

Rearranging in alphabetical order gives A, B, C, D, E, F.

Comparing both arrangements: Position 1: B vs A Position 2: C vs B Position 3: A vs C Position 4: E vs D Position 5: D vs E Position 6: F vs F

Only bag F remains at position 6 in both arrangements, so the position of exactly one bag remains unchanged.

Explanation

The given sequence consists of three-letter groups where each group starts with the letter 'a', followed by two consecutive letters of the alphabet:

abc acd ade aef afg

Sequentially filling the blanks with c, d, a, and f completes this pattern.

Explanation

The pattern in the given series alternates between dividing by 2 and subtracting 1, and dividing by 2 and adding 1:

86 ÷ 2 - 1 = 42 42 ÷ 2 + 1 = 22 22 ÷ 2 - 1 = 10 10 ÷ 2 + 1 = 6

Alternatively, each term is obtained by alternating between subtracting 2 or adding 2, then dividing the result by 2:

(86 - 2) ÷ 2 = 42 (42 + 2) ÷ 2 = 22 (22 - 2) ÷ 2 = 10 (10 + 2) ÷ 2 = 6

Explanation

Turtle has two children: Frog and Moth. Since Bird is the granddaughter of Turtle and the only child of her parents, Bird must be the child of Moth. Chip is a grandson of Turtle and the son of Fish. This means Chip's father must be Turtle's son, Frog. Since Fish is the mother of Chip and Frog is the father of Chip, Fish is the wife of Frog.

Explanation

X and Y are siblings, and Z is their mother. A is the father of Z, which makes Z the daughter of A. Since X is the daughter of Z, X is related to A as his daughter's daughter.

Explanation

Each letter in the word is shifted forward by two positions in the alphabetical series (+2 pattern):

B (+2) = D, O (+2) = Q, M (+2) = O, B (+2) = D, A (+2) = C, Y (+2) = A

Applying the same +2 shift to each letter of CALCUTTA:

C (+2) = E A (+2) = C L (+2) = N C (+2) = E U (+2) = W T (+2) = V T (+2) = V A (+2) = C

This gives the coded word ECNEWVVC.

Explanation

All five people mentioned in the given statements—Sanjay, Neetu, Priya, Manju, and Kapil—like the colour Blue. Sanjay and Neetu like Blue; Priya and Neetu like Blue; Sanjay, Manju, and Kapil like Blue; and Neetu and Manju like Blue. With all 5 individuals preferring it, Blue has the highest number of people who like it.

Explanation

Let the weight of B be x kg.

From the given statements: A = 2x C = x/2 D = x + 60 = 2x - 60

Equating the two expressions for D: 2x - x = 60 + 60 x = 120 kg

Calculating the individual weights: A = 2 × 120 = 240 kg B = 120 kg C = 120 / 2 = 60 kg D = 120 + 60 = 180 kg

Comparing the values, 240 kg > 180 kg > 120 kg > 60 kg, showing that A has the highest weight.

Explanation

Let B be the number of boys and G be the number of girls. Given G = ½ × B and G + B = 48: (3/2) × B = 48 B = 32 and G = 16

Rashmi's rank is 15th from the top, which means 14 students are ranked ahead of her. Since 5 of these 14 students are girls, the number of boys ranked ahead of Rashmi is 14 - 5 = 9.

The number of boys whose ranks are below Rashmi = Total boys - Boys ahead of Rashmi = 32 - 9 = 23.

Explanation

The pattern in the series involves adding consecutive even numbers starting from 50:

600 + 50 = 650 650 + 52 = 702 702 + 54 = 756 756 + 56 = 812

The missing number is obtained by adding 54 to 702, which equals 756.

Explanation

The pattern follows the relation: Second number = (First number)² + 3.

For the first pair: 5² + 3 = 25 + 3 = 28

Applying the same relation to the third number: 7² + 3 = 49 + 3 = 52

Explanation

The series follows the pattern n² - 1 for consecutive integers starting from n = 6:

6² - 1 = 35 7² - 1 = 48 8² - 1 = 63 9² - 1 = 80 10² - 1 = 99

Alternatively, the difference between consecutive terms increases by 2 each step: 13, 15, 17, 19. Adding 19 to 80 yields 99.

Explanation

By analyzing the common letters across the given words and their corresponding codes:

In BOOK = 4662, the repeated digit 6 corresponds to O, giving O = 6, B = 4, and K = 2. In COKE = 3625, substituting O = 6 and K = 2 gives C = 3 and E = 5. In COAL = 3617, substituting C = 3 and O = 6 gives A = 1 and L = 7.

Substituting these letter values for LOCK gives L = 7, O = 6, C = 3, and K = 2, which results in 7632.

Explanation

The total number of balls remains conserved because balls are only transferred among the five friends and no balls are added or removed from the group. Since there are 5 friends and each initially starts with 8 balls, the total number of balls is 5 × 8 = 40. Therefore, after all the internal exchanges, the total number of balls with all five friends remains 40.

Explanation

The pattern converts an expression AB - CD into (A × B) + (C + D), taking the product of the digits of the first number and adding it to the sum of the digits of the second number.

For 34 - 23: (3 × 4) + (2 + 3) = 12 + 5 = 17 For 74 - 61: (7 × 4) + (6 + 1) = 28 + 7 = 35 For 82 - 36: (8 × 2) + (3 + 6) = 16 + 9 = 25

Applying the same rule to 69 - 42: (6 × 9) + (4 + 2) = 54 + 6 = 60

Explanation

The given series follows a distinct pattern in each of its three components:

First letter: Increases by 2 positions in the alphabetical order. G (+2) → I (+2) → K (+2) → M

Middle number: Represents the alphabetical position of the first letter, increasing by 2 in each step. 7 (+2) → 9 (+2) → 11 (+2) → 13

Second letter: Follows the pattern where its alphabetical position is obtained by adding 1, 0, 1, 1 respectively to the position of the first letter. For M (13th letter), adding 1 gives 14, which corresponds to N.

Combining these components gives M13N.

Explanation

Laxman's mother's father is his maternal grandfather. The only son of his maternal grandfather is Laxman's maternal uncle. Thus, Laxman is the sister's son of the man in the photograph.

Explanation

The coding scheme replaces each letter with its reverse alphabetical pair, where the sum of the numerical positions of corresponding letters equals 27.

In BREAK: B (2) + Y (25) = 27 R (18) + I (9) = 27 E (5) + V (22) = 27 A (1) + Z (26) = 27 K (11) + P (16) = 27

Applying the same pattern to MANGO: M (13) → N (14) A (1) → Z (26) N (14) → M (13) G (7) → T (20) O (15) → L (12)

Thus, MANGO is coded as NZMTL.

Explanation

The series follows the pattern of cubes of consecutive even numbers:

12³ = 1728 14³ = 2744 16³ = 4096 18³ = 5832 20³ = 8000

Calculating 18³ gives 18 × 18 × 18 = 5832.

Explanation

Replacing the symbols according to the given instructions:

• becomes ÷ becomes + ^+ becomes × × becomes -

Substituting these into the given expression yields: 91 ÷ 13 + 11 × 3 - 15

Applying the BODMAS rule: First, perform division: 91 ÷ 13 = 7 Next, perform multiplication: 11 × 3 = 33 Finally, perform addition and subtraction: 7 + 33 - 15 = 40 - 15 = 25

Explanation

By compiling the distinct subjects assigned to all teachers: Sameer teaches English, Computers, and Science; Madhur teaches Mathematics, English, and Science; Gunjan and Jack teach Music and Mathematics, with Gunjan also teaching Computers and English; and Shweta teaches Computers, English, and Social Studies. Enumerating all unique subjects yields English, Computers, Science, Mathematics, Music, and Social Studies, which gives a total of 6 subjects.

Explanation

Each letter in the given word is shifted forward by 2 positions in alphabetical order:

C + 2 = E O + 2 = Q M + 2 = O P + 2 = R U + 2 = W T + 2 = V E + 2 = G R + 2 = T

Applying the same +2 shift rule to ENGLISH:

E + 2 = G N + 2 = P G + 2 = I L + 2 = N I + 2 = K S + 2 = U H + 2 = J

This gives GPINKUJ.

Explanation

Gas is stored and contained in a cylinder for storage and usage. Similarly, water is stored and contained in a tank. The relationship between the pairs is that of a substance and its designated storage container.

Explanation

The statement specifies that the people of Kerala prepare many dishes using coconut oil. Cooking a large number of dishes in coconut oil directly implies a high usage of coconut oil within the state, making conclusion 2 a logical inference. Conclusion 1 makes a claim about the entire country, which cannot be inferred since the given statement provides information exclusively about Kerala and gives no data regarding other regions.

Explanation

Each letter in the first term is shifted forward by one position (+1) in alphabetical order to obtain the second term: B (+1) = C O (+1) = P W (+1) = X

Applying the same pattern to EQY gives: E (+1) = F Q (+1) = R Y (+1) = Z

Explanation

A minute is a larger unit of time composed of seconds, where 60 seconds make up one minute. In the same way, a week is a larger unit of time composed of days, where 7 days make up one week.

Explanation

Manure is a decomposed mixture of organic waste, such as animal dung and plant residue, used to enrich soil. Unlike the remaining items, which are specific chemical elements that serve as primary plant nutrients, manure is a bulk organic material.

Explanation

The code is formed by reversing the order of letters in the word and then alternately shifting each letter by +1 and -1 positions in the alphabet:

Reversing FATHER gives R-E-H-T-A-F: R (+1) = S E (-1) = d H (+1) = i T (-1) = s A (+1) = b F (-1) = e This gives Sdisbe.

Applying the same pattern to SISTER: Reversing SISTER gives R-E-T-S-I-S: R (+1) = S E (-1) = d T (+1) = u S (-1) = r I (+1) = j S (-1) = r

This gives Sdurjr.

Explanation

Gold is extracted from beneath the earth's surface through a Mine. Similarly, Petroleum is extracted from below the ground through a Well.

Explanation

Each letter in the first term is shifted forward by 2 positions in the alphabetical order to get the corresponding letter in the second term:

G (+2) = I H (+2) = J S (+2) = U T (+2) = V

Applying the same pattern to CDTU:

C (+2) = E D (+2) = F T (+2) = V U (+2) = W

This gives the pattern term EFVW.

Explanation

Statement 3 asserts that no crow is brown. In categorical logic, a universal negative statement of the form No A is B logically converts to No B is A. Therefore, Conclusion 3, No brown is a crow, is a direct and definite conversion of Statement 3. Meanwhile, no definite relationship exists between blue and crow, and a particular affirmative statement like Some black are crows cannot be converted into a universal statement like All crows are black. Consequently, only Conclusion 3 logically follows.

Explanation

Shalini plays Cricket and Badminton, and also plays Badminton and Kabaddi. Combining these, Shalini plays Cricket, Badminton, and Kabaddi. Since she is not among the players listed for Ludo, she plays Badminton, Cricket, and Kabaddi but NOT Ludo.

Explanation

Black is not a color in the rainbow spectrum (VIBGYOR). It represents the complete absence or total absorption of visible light, whereas the others are spectral colors corresponding to specific wavelengths of light within the visible spectrum.

Explanation

The word is divided into three parts: the first three letters, the middle letter, and the last three letters.

First part: ALG Middle letter: E Last part: BRA

The coding rule places the last part first, followed by the middle letter, and finishes with the reversed first part: Last part: BRA Middle letter: E Reversed first part: GLA

Combining these parts in order yields BRAEGLA.

Explanation

In BL, the numerical difference between the alphabetical positions of L (12) and B (2) is 10, whereas in all the other given letter-pairs, the second letter is located 11 positions after the first letter in the English alphabetical order.

Explanation

The statement that teachers make friends with only tall people means that being tall is a necessary condition for being a friend of a teacher. Since Tandon is very tall, Tandon satisfies the requirement to be eligible for friendship with a teacher. This means Tandon may or may not be friends with a teacher. Since a person must either be friends with a teacher or not friends with a teacher, Conclusions I and II form a complementary pair covering all possible outcomes. Thus, either conclusion I or II must follow.

Explanation

Rank from the last = (Total number of students - Rank from top) + 1

Substituting the given values: Rank from the last = (29 - 11) + 1 = 18 + 1 = 19

Explanation

Replacing each letter with its alphabetical position value (A = 1, B = 2, ..., Z = 26):

Left side product: D × R = 4 × 18 = 72

Right side product must also equal 72: F × A × ? = 72 6 × 1 × ? = 72 ? = 72 / 6 = 12

The 12th letter of the alphabet is L.

Explanation

The given word is divided into groups of three letters each, and the letters within each block are rearranged in the order of 3rd, 1st, and 2nd letter.

Applying this pattern to MONOLATERALS: MON becomes NMO OLA becomes AOL TER becomes RTE ALS becomes SAL

Applying the same pattern to ABRACADABRAS: ABR becomes RAB ACA becomes AAC DAB becomes BDA RAS becomes SRA

Combining these transformed groups yields RABAACBDASRA.

Explanation

The phrase 'father of your wife' refers to Y's father-in-law. The 'grandson of the father of your wife' is a grandson of Y's father-in-law. This grandson can be either Y's own son or the son of Y's wife's brother. Since X explicitly states that he is not Y's son, but is related to Y's wife's brother, X is the son of Y's wife's brother.