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

Explanation

Conclusion 1 introduces animal deaths, which is outside the scope of the statement as no relation between water scarcity and animal mortality is mentioned. Conclusion 2 claims that there is no water shortage in winter; however, stating that the problem is major especially in summer does not imply that shortages are completely absent during winter. Since both conclusions rely on assumptions not stated in or directly implied by the premise, neither conclusion logically follows.

Explanation

The year 2012 was a leap year, so February had 29 days. Counting the days month by month with both start and end dates included:

Days in February (from 17 February to 29 February inclusive) = 29 - 17 + 1 = 13 days Days in March = 31 days Days in April (from 1 April to 27 April inclusive) = 27 days

Total number of days Mona resided at place X = 13 + 31 + 27 = 71 days.

Explanation

By the rule of immediate conversion in categorical logic, a particular affirmative statement of the form "Some A are B" logically converts to "Some B are A". Statement 2 asserts that "Some animals are men", which directly yields "Some men are animals" by conversion. Therefore, conclusion 3 logically follows.

Explanation

The selection M1, W5, W4, M4, W3 fulfills all specified conditions. It consists of 5 members containing 3 women (W3, W4, and W5), satisfying the requirement of having at least three women in the team. M1 is included without M3, adhering to the condition that M1 and M3 cannot be selected together. W5 is included without W6, W2, or M2, satisfying the restrictions on W5. Furthermore, since M2, M5, and W6 are not selected, none of the remaining selection constraints are violated.

Explanation

In the English alphabetical series, the positional difference between V (22) and X (24) is +2, whereas all other letter-clusters have a positional difference of +3 between their constituent letters.

Explanation

The given series follows the pattern p² - 1, where p represents consecutive prime numbers starting from 3:

3² - 1 = 9 - 1 = 8 5² - 1 = 25 - 1 = 24 7² - 1 = 49 - 1 = 48 11² - 1 = 121 - 1 = 120 13² - 1 = 169 - 1 = 168

The next prime number in the sequence after 13 is 17. Applying the pattern: 17² - 1 = 289 - 1 = 288.

Explanation

Total number of students who like English = 60 Number of students who like only English = 30 Number of students who like English and Hindi both = 20

The remaining students who like English must be those who like all four subjects: Students who like all 4 subjects = Total English - (Only English + English and Hindi) = 60 - (30 + 20) = 10

Similarly, for Hindi: Total Hindi = 55 Only Hindi = 25 English and Hindi = 20 Students who like all 4 subjects = 55 - (25 + 20) = 10

Explanation

Converting the letters to their numerical positions in the English alphabet: D = 4 I = 9 N = 14 S = 19

The pattern adds 5 to the position of each letter: 4 + 5 = 9 (I) 9 + 5 = 14 (N) 14 + 5 = 19 (S) 19 + 5 = 24 (X)

The 24th letter of the alphabet is X.

Explanation

The code value is obtained by taking the sum of the standard alphabetical positions (A = 1, B = 2, ..., Z = 26) of each letter in the word.

For CHARGER: C(3) + H(8) + A(1) + R(18) + G(7) + E(5) + R(18) = 60

Applying the same rule to TOPPER: T(20) + O(15) + P(16) + P(16) + E(5) + R(18) = 90

Explanation

Saudi Arabia is ruled by a monarchy, which represents its political system and form of government. Similarly, India's form of government is a democracy, as declared in the Preamble of its Constitution, where supreme power is vested in the citizens who elect their representatives through free and fair elections.

Explanation

Placing the letters b, b, b, and a sequentially into the four blanks completes the 12-letter sequence:

a b b [b] a [b] b [b] [a] b b b

Dividing this sequence into groups of four reveals the repeating pattern:

abbb | abbb | abbb

The underlying repeating unit is abbb, which occurs three times consecutively throughout the sequence.

Explanation

Statement 1 is a particular affirmative proposition stating "Some dogs are cats". By the rule of simple conversion, an I-type proposition of the form "Some A are B" directly yields "Some B are A". Thus, "Some cats are dogs" (Conclusion 4) is a valid, direct inference from Statement 1. Conclusions 1, 2, and 3 fail to follow because no definite relation is established between cats and mosquitoes, rats and dogs, or mosquitoes and dogs across all possible Venn diagram representations. Therefore, only Conclusion 4 logically follows.

Explanation

The statement strictly establishes a link between water pollution and the incidence of diseases. It provides no information regarding the severity or deadliness of these diseases, rendering Conclusion 1 an invalid inference. Similarly, Conclusion 2 discusses seasonal water shortage, a topic entirely outside the scope of the statement. Logical conclusions must be directly supported by or derived from the given premise without assuming external facts.

Explanation

Manisha is the sister of Urmila. Since Suman is the daughter of Manisha, Suman is Urmila's sister's daughter. Jatin is the son of Suman, which makes Jatin the son of Urmila's sister's daughter, or her sister's daughter's son.

Explanation

Since the ages are successive multiples of 3 from left to right and D has the maximum age of 18 years, D occupies position 6 at the right end. The ages from position 1 to 6 are 3, 6, 9, 12, 15, and 18 years respectively.

With three persons sitting between C and F, they must occupy positions 1 and 5. Since C is to the left of E, C takes position 1 and F takes position 5. The remaining middle positions 2, 3, and 4 are occupied by A, E, and B respectively, fulfilling the conditions that A is to the immediate left of E and B is second to the right of A.

The age of A at position 2 is 6 years and the age of B at position 4 is 12 years. The combined age of A and B is 6 + 12 = 18 years.

Explanation

To find the total number of students in the class, sum the number of students in each distinct category:

Total students = (Maths and History) + (Only Hindi) + (Only English) + (English and Hindi) + (Only History) + (Only Maths) + (All 4 subjects)

Total students = 25 + 25 + 30 + 20 + 15 + 15 + 15 = 145

Explanation

A rectangular table with four corners has exactly two pairs of diagonally opposite seats. Since Shruti and Payal occupy one pair of diagonally opposite corners, the remaining two corners are occupied by Ankita and Mahak, making them diagonally opposite to each other.

Explanation

A glacier is a large, dense mass of ice formed from accumulated snow that moves slowly over land under its own weight, making it a feature of frozen water belonging to the cryosphere. In contrast, geological features such as valleys, plateaus, and hills are solid landforms formed from rock, soil, and landmass. A glacier is uniquely composed of ice rather than earth materials.

Explanation

The given series follows three independent arithmetic progressions for the first letter, second letter, and the numerical value:

First letter advances by +2 in alphabetical position: E (5) → G (7) → I (9) → K (11) → M (13). Second letter advances by +3 in alphabetical position: F (6) → I (9) → L (12) → O (15) → R (18). Numerical value advances by +7: 27 → 34 → 41 → 48 → 55.

Combining the resulting components gives MR55.

Explanation

By the law of immediate inference (conversion), a universal affirmative statement of the form "All A are B" can be validly converted into a particular affirmative statement "Some B are A". Applying conversion to the statement "All kitchens are bedrooms" directly yields "Some bedrooms are kitchens".

Explanation

The series follows an arithmetic pattern in the positional values of the letters in the English alphabet:

H (8) + 3 = K (11) K (11) + 3 = N (14) N (14) + 3 = Q (17) Q (17) + 3 = T (20)

Adding 3 to the alphabetical position of Q (17) yields 20, which corresponds to the letter T.

Explanation

To find the sum of the fractions:

1/3 + 4/3 + 3/4 = (1 + 4)/3 + 3/4 = 5/3 + 3/4

Taking the least common multiple (LCM) of the denominators 3 and 4, which is 12:

5/3 + 3/4 = (5 × 4 + 3 × 3)/12 = (20 + 9)/12 = 29/12

Explanation

World Environment Day is celebrated globally on 5th June every year. Established by the United Nations General Assembly in 1972 on the opening day of the Stockholm Conference on the Human Environment, it serves as the United Nations' principal vehicle for encouraging awareness and action for the protection of the environment. First observed in 1973, it has grown to become a global platform for public outreach led by the United Nations Environment Programme (UNEP).

Explanation

Samudragupta, the second ruler of the Gupta Empire, was a great patron of art and an accomplished musician. His artistic talents, particularly his skill in playing the veena, are depicted on a set of gold coins issued during his reign showing him seated on a couch playing the instrument. The Prayag Prashasti (Allahabad Pillar Inscription), composed by his court poet Harishena, praises his musical capabilities and describes his mastery over music as superior to that of celestial musicians like Tumburu and Narada.

Explanation

The words represent social units arranged in increasing order of size and scope, starting from the smallest unit to the largest. An individual forms part of a family, multiple families constitute a community, communities make up a country, and countries collectively form the world. Therefore, the logical sequence from smallest to largest is Individual (3) → Family (1) → Community (4) → Country (5) → World (2).

Explanation

In each row, the letter pattern and number pattern follow distinct rules across the columns.

For the letters, each element moves forward by 3 positions in the English alphabet from left to right. In the second row, K (position 11) plus 3 gives N (position 14), and N (14) plus 3 gives Q (position 17).

For the numbers, the third number is the sum of the first two numbers in that row. In the second row, 8 plus 9 equals 17.

Combining the letter and number yields Q17.

Explanation

Arranging the positions from left to right (1 to 5):

Since L1 is at one end and L3 is to her immediate right, L1 is at position 1 and L3 is at position 2. L4 is to the immediate right of L3 at position 3.

Since M5 is opposite L3, M5 is at position 2. Since M4 is opposite L4, M4 is at position 3.

For men facing south, immediate left corresponds to the rightward direction (position 4). Thus, M2 is at position 4, placing L5 opposite him at position 4.

The remaining position 5 in the women's line is occupied by L2. Since M3 and L2 are diagonally opposite, M3 takes position 1 in the men's line, leaving M1 at position 5.

The positions from left to right are M3-M5-M4-M2-M1 for men and L1-L3-L4-L5-L2 for women. The pair M1 (top right end) and L1 (bottom left end) are diagonally opposite each other.

Explanation

By the chain rule of syllogism, if all guitars are instruments (A ⊆ B) and all instruments are bagpipes (B ⊆ C), it directly follows that all guitars are bagpipes (A ⊆ C).

Explanation

A spade is an agricultural or gardening tool with a broad blade used primarily for digging, moving soil, or turning earth, whereas the other three are handheld bladed instruments or weapons designed primarily for cutting, stabbing, or combat.

Explanation

Tinsukia is a city in Assam and not a state capital, whereas the other three are capital cities of Indian states.

Explanation

Akshay's son-in-law is married to Akshay's daughter, which means Anisha is Akshay's daughter. Since Vijay is Anisha's brother, Vijay is Akshay's son. Twinkle is married to Vijay, making her the wife of Akshay's son, or Akshay's daughter-in-law.

Explanation

Decoding the given expression step-by-step:

To > Ko means To is the daughter of Ko. Ro / To means Ro is the brother of To, which makes Ro and To siblings, so Ko is their mother. Qo # Ro means Qo is the father of Ro (and To), which means Qo is Ko's husband. Po S Qo means Po is the mother of Qo.

Since Qo is Ko's husband and Po is Qo's mother, Po is Ko's husband's mother.

Explanation

Given that C got the 1st rank, E must score the least, taking the 6th rank.

Since E and F are close competitors, F takes the rank adjacent to E, which is the 5th rank.

The remaining ranks to fill are 2nd, 3rd, and 4th, for students D, A, and B. Since D scored higher than A and they are close competitors, D immediately precedes A. Combined with the condition that A scored higher than B, the remaining order must be D (2nd rank), A (3rd rank), and B (4th rank).

Thus, the overall ranking from 1st to 6th is C, D, A, B, F, E, placing A in the 3rd rank.

Explanation

Rina is listed as being good at hockey and chess alongside Rima and Komal, as well as badminton alongside Rima. Guitar is only played by Vimal, Kamal, Rima, and Sima, meaning Rina is not good at guitar. This satisfies all conditions of being good at hockey, chess, and badminton, but not guitar.

Explanation

The relationship between the terms is based on direct outcome or consequence. Enforcement of law maintains order in society, and similarly, committing a crime results in punishment.

Explanation

Since D is the father of B and E is the wife of D, E is the mother of B. Given that B is the wife of A, E is the mother of A's wife, which makes E the mother-in-law of A.

Explanation

An advertisement is designed to appeal to existing desires or needs of consumers. Advertising XYZ paints for house decoration inherently assumes that people have an interest or desire to decorate their houses, making Assumption 1 implicit. Assumption 2 is not implicit because the presence of the restrictive word "only" creates an extreme condition; an advertisement promotes its product without assuming that no other brand can perform the same function.

Explanation

The pattern follows a simple alphabetical shift where each letter in the word is moved forward by one position (+1):

L (+1) = M, A (+1) = B, U (+1) = V, G (+1) = H, H (+1) = I, T (+1) = U, E (+1) = F, R (+1) = S

Applying the same +1 forward shift to each letter of DEPRESSION:

D (+1) = E E (+1) = F P (+1) = Q R (+1) = S E (+1) = F S (+1) = T S (+1) = T I (+1) = J O (+1) = P N (+1) = O

This gives the coded string EFQSFTTJPO.

Explanation

The n-th term of the series follows the pattern T_n = n × (4n + 1).

T₁ = 1 × 5 = 5 T₂ = 2 × 9 = 18 T₃ = 3 × 13 = 39 T₄ = 4 × 17 = 68 T₅ = 5 × 21 = 105 T₆ = 6 × 25 = 150

Alternatively, the differences between consecutive terms are 13, 21, 29, and 37, which increase by a constant difference of 8. The next difference is 37 + 8 = 45, giving 105 + 45 = 150.

Explanation

Argument 1 is strong because periodic transfer of administrative officers is a recognized governance mechanism designed to prevent local nexuses, bias, corruption, and undue influence, thereby ensuring administrative integrity and impartiality in public service.

Argument 2 is weak because personal inconvenience or individual dislike towards transfers is a subjective preference that cannot override public interest or administrative policy requirements.

Explanation

Soft and delicate are synonyms because both words share a similar meaning, describing something gentle, fine, or easily damaged. The other word pairs consist of antonyms, which are words with opposite meanings, making this pair the odd one out.

Explanation

Each letter in the first term is replaced by its opposite letter in the English alphabet, where the sum of the positional values of corresponding letters is 27.

In DMO:WNL: D (4) + W (23) = 27 M (13) + N (14) = 27 O (15) + L (12) = 27

Similarly, in GHI:TSR: G (7) + T (20) = 27 H (8) + S (19) = 27 I (9) + R (18) = 27

Explanation

The series is formed by three independent patterns across each term:

The first numbers follow a sequence of alternate prime numbers: 2 (1st prime), 5 (3rd prime), 11 (5th prime), 17 (7th prime), and 23 (9th prime).

The middle letters follow reverse alphabetical order: T, S, R, Q, P.

The last numbers increase by 3 in each step: 3, 6, 9, 12, 15.

In 16Q12, the first number is 16 instead of 17, breaking the sequence of alternate prime numbers.

Explanation

The pattern multiplies the terms at odd positions by the adjacent numbers at even positions:

14 × 2 = 28 28 × 3 = 84 84 × 4 = 336

Explanation

D is the maternal grandmother of B, and F is D's husband, making F the maternal grandfather of B. Since A is the mother of B, A is the daughter of D and F. F has only one daughter, so A is F's only daughter. Since E is the son-in-law of F, E is married to F's daughter A, which makes E the husband of A.

Explanation

From the relation A < B < C, it is directly derived that A < C, which can be rewritten as C > A. From the relation E > A, it can be rewritten as A < E. Combining these two established inequalities with respect to A yields C > A < E.

Explanation

Dharamshala serves as the winter capital of Himachal Pradesh. Similarly, Nagpur serves as the winter capital of Maharashtra, where the winter session of the state legislative assembly is held.

Explanation

The position of an item from the left end is calculated using the formula: Position from Left = Total items - Position from Right + 1.

Substituting the given values: Position from Left = 35 - 15 + 1 = 21st

Explanation

The statement merely specifies what X did not do, which is solving the equation on a blackboard using chalk. It provides no information about where, how, or even if the equation was solved, nor what alternative writing instrument was used. Assuming that the equation was solved on paper or that X used a marker on the blackboard represents pure speculation beyond the given context. Neither assumption logically follows from the statement.

Explanation

B is the husband of A, so H (son of B) is the son of A. H is the father of G, making G the son's son of A. G is the only brother of unmarried F, and since F is the sister-in-law of E, E must be married to G. Since E is the mother of D and C, C is the child of G. Tracing from A: H is A's son, G is H's son (A's son's son), and C is G's son (A's son's son's son).