RRB NTPC CBT 1 2020 General Intelligence & Reasoning Questions with Solutions

Explanation

The positional values of letters in each term follow an arithmetic progression with an increasing common difference:

1st term (ABCD): step size of +1 → A(1), B(2), C(3), D(4) 2nd term (ACEG): step size of +2 → A(1), C(3), E(5), G(7) 3rd term: step size of +3 → A(1), D(4), G(7), J(10) 4th term (AEIM): step size of +4 → A(1), E(5), I(9), M(13)

Alternatively, looking at the positional pattern position-by-position across the terms: 1st letters: A, A, A, A (constant) 2nd letters: B(2), C(3), D(4), E(5) (increment of +1) 3rd letters: C(3), E(5), G(7), I(9) (increment of +2) 4th letters: D(4), G(7), J(10), M(13) (increment of +3)

Both approaches consistently yield ADGJ for the missing term.

Explanation

B is explicitly identified as the teacher, C as the lawyer, and D as the accountant. The remaining two individuals, A and E, must hold the remaining two professions of doctor and engineer. Because there is no additional constraint specifying which of the two is the engineer, A can be the engineer while E is the doctor.

Explanation

Mahesh is the father of Ram, and Ram is the brother of Shyam, which makes Mahesh the father of Shyam as well. Jagat is the brother of Priya, who is the daughter of Shyam, meaning Jagat is Shyam's son. Since Mahesh is the father of Shyam, Mahesh is the paternal grandfather of Jagat.

Explanation

The possible integer costs between ₹40 and ₹50, excluding ₹44, are ₹41, ₹42, ₹43, ₹45, ₹46, ₹47, ₹48, and ₹49.

D is odd and G = D + 3. Since ₹44 is excluded, D cannot be ₹41 (which would make G = ₹44). Setting D = ₹45 gives G = ₹48.

A has a prime cost and F = A + 2. Setting A = ₹47 gives F = ₹49.

Since C = E - 5 and F > E, choosing E = ₹46 gives C = ₹41. The remaining even cost ₹42 goes to B.

The final costs are C = ₹41, B = ₹42, D = ₹45, E = ₹46, A = ₹47, G = ₹48, and F = ₹49. Since E costs ₹46, chocolate G (at ₹48) is costlier than E.

Explanation

To minimize the expression 1 @ 2 @ 3 @ 4 @ 5, observe that for any two integers x, y ≥ 2, their product (x × y) is greater than or equal to their sum (x + y). Therefore, applying multiplication between numbers greater than 1 increases the total value.

For the first pair involving 1, multiplication gives 1 × 2 = 2, whereas addition gives 1 + 2 = 3. Using multiplication for the first operator decreases the total value by 1 compared to addition.

Thus, the minimum value is obtained by choosing '×' for the first operator and '+' for all subsequent operators: 1 × 2 + 3 + 4 + 5 = 2 + 3 + 4 + 5 = 14

Explanation

In the expression pSq#r:

p S q means p is the wife of q, establishing that p is female and q is male (husband). q # r means q is the father of r.

Since q is the father of r and p is the wife of q, p is the mother of r. This establishes the direct parent-child relationship where r is the offspring of p.

Explanation

Each letter in the four-letter cluster advances by 2 positions (+2) in alphabetical order across the series:

First position: K (11) + 2 = M (13), M + 2 = O (15), O + 2 = Q (17), Q + 2 = S (19) Second position: A (1) + 2 = C (3), C + 2 = E (5), E + 2 = G (7), G + 2 = I (9) Third position: B (2) + 2 = D (4), D + 2 = F (6), F + 2 = H (8), H + 2 = J (10) Fourth position: L (12) + 2 = N (14), N + 2 = P (16), P + 2 = R (18), R + 2 = T (20)

Combining these letters gives SIJT.

Explanation

In the given number pairs, the relation between the second number (n) and the first number is defined by 10 × n + 4. For the pair 66, 6, applying this formula gives 10 × 6 + 4 = 64 instead of 66, making this pair the odd one out.

Explanation

Two particular premises (I-type statements) cannot be combined to form a definitive relation between terms that are not directly linked. Therefore, from "Some dolls are plants" and "Some plants are books", Conclusion 1 ("Some dolls are books") does not follow.

Furthermore, Statement 2 directly asserts that "Some plants are books", which logically implies that "Some books are plants". Consequently, Conclusion 2 ("No book is a plant") contradicts Statement 2 and cannot follow. Thus, neither conclusion 1 nor conclusion 2 follows.

Explanation

Replace the operators according to the given rules:

• is replaced by - × is replaced by ÷
• is replaced by + is replaced by ×

Substituting these into the given expression 25 + 48 × 6 + 12 - 2 gives: 25 - 48 ÷ 6 + 12 × 2

Applying BODMAS rules (order of operations): Perform division: 48 ÷ 6 = 8 Perform multiplication: 12 × 2 = 24

The expression simplifies to: 25 - 8 + 24 = 17 + 24 = 41

Explanation

The series decreases by 16 at each step: 48 - 16 = 32 32 - 16 = 16 16 - 16 = 0

Explanation

The given conditional statement is of the form "If P, then Q", where P is "Sakshi hears of someone's birthday" and Q is "Sakshi orders a cake". A logically consistent inference from "If P, then Q" is its contrapositive, "If not Q, then not P". Here, "not Q" is statement D (Sakshi did not order a cake) and "not P" is statement B (Sakshi did not hear of someone's birthday). Therefore, the pair DB is logically consistent with the main statement.

Explanation

Comparing 'get up and go' (fa ka la ju) and 'go there jump here' (na lu fu ka), the common word 'go' corresponds to 'ka'.

Comparing 'get up and go' (fa ka la ju) and 'jump up and dance' (lu la hu fa), the common words 'up' and 'and' correspond to 'fa' and 'la'.

Comparing 'jump up and dance' (lu la hu fa) and 'and there you come' (na lu ya la), the common word 'and' corresponds to 'la', which leaves 'up' as 'fa'.

In 'get up and go' (fa ka la ju), since 'go' = 'ka', 'up' = 'fa', and 'and' = 'la', the remaining word 'get' corresponds to 'ju'.

Comparing 'go there jump here' (na lu fu ka) and 'and there you come' (na lu ya la), the common word 'there' corresponds to 'na'.

Combining all four words, 'get' (ju), 'up' (fa), 'go' (ka), and 'there' (na) gives 'fa ju ka na'.

Explanation

Statement 1 gives the date as the 7th of a month, which alone is insufficient as the month is unknown.

Statement 2 uniquely identifies the month as February, since February is the only month in the calendar that has 29 days in a leap year.

Combining both statements yields the precise date of the wedding anniversary: 7th February.

Explanation

Analyzing the series from right to left, the differences between consecutive terms follow a pattern involving consecutive odd squares plus increasing even numbers:

41 - 16 = 25 (5² + 0) 92 - 41 = 51 (7² + 2)

Following this sequence, the next term should be obtained by adding 85 (9² + 4) to 92, which equals 177 instead of 230.

Explanation

According to A, the birthday lies between 12th March and 15th March, which leaves 13th March and 14th March as the possible dates. According to B, the birthday lies between 13th March and 17th March, which leaves 14th March, 15th March, and 16th March as the possible dates. The only date common to both conditions is 14th March.

Explanation

An edition refers to a specific version, publication, or printing of a book as a whole, rather than a section or part contained within the book itself. In contrast, the remaining terms represent structural components or sections found inside a book.

Explanation

The series follows a pattern where each cluster consists of the first four multiples of consecutive integers starting from 2:

1st cluster: 2 × 1 = 2, 2 × 2 = 4, 2 × 3 = 6, 2 × 4 = 8 2nd cluster: 3 × 1 = 3, 3 × 2 = 6, 3 × 3 = 9, 3 × 4 = 12 3rd cluster: 4 × 1 = 4, 4 × 2 = 8, 4 × 3 = 12, 4 × 4 = 16

Following this pattern, the next cluster consists of the first four multiples of 5: 5 × 1 = 5, 5 × 2 = 10, 5 × 3 = 15, 5 × 4 = 20

Explanation

The series follows the pattern of consecutive base numbers raised to consecutive increasing powers starting from 1:

3¹ = 3 4² = 16 5³ = 125

Following this pattern, the missing term is 6⁴ = 1296.

Explanation

In Set A, the first statement establishes that the set of all shops is entirely contained within the set of showrooms (Shops ⊆ Showrooms). The second statement asserts that showrooms and malls have no elements in common (Showrooms ∩ Malls = ∅). Since shops are completely inside showrooms, shops also cannot have any elements in common with malls (Shops ∩ Malls = ∅). Therefore, no shop is a mall, making the third statement a valid logical conclusion derived directly from the first two statements.

Explanation

The given statements only provide information about the number of wickets taken by spinners (6 out of 9). They do not provide any details regarding the total proportion or percentage of spinners in the team, nor do they specify which bowlers opened the bowling attack. Performance in terms of wickets taken does not determine the team composition or the bowling order.

Explanation

A gardener is the person responsible for the care, maintenance, and management of a garden. Similarly, a curator is the keeper or administrative official in charge of managing, taking care of, and overseeing a museum and its collections.

Explanation

The terms in the series follow the pattern n(n + 1) for consecutive integers starting from n = 1:

1 × 2 = 2 2 × 3 = 6 3 × 4 = 12 4 × 5 = 20 5 × 6 = 30 6 × 7 = 42 7 × 8 = 56

Alternatively, the difference between consecutive terms increases by 2 each time: +4, +6, +8, +10, +12. Thus, adding 14 to 42 yields 56.

Explanation

An assumption is an underlying belief or unstated premise required to make a statement logical. The claim that pleasure is desirable rests on the premise of psychological hedonism, which posits that seeking pleasure is a universal human trait. Defining an object or state as desirable on the grounds that it is sought by people requires assuming that everyone desires pleasure, thereby linking universal human desire to desirability.

Explanation

Each letter in the word is shifted forward by 2 positions in the alphabetical order: V (+2) = X, I (+2) = K, A (+2) = C, R (+2) = T, A (+2) = C, I (+2) = K, L (+2) = N.

Applying the same pattern to STRATEGY: S (+2) = U T (+2) = V R (+2) = T A (+2) = C T (+2) = V E (+2) = G G (+2) = I Y (+2) = A

This yields UVTCVGIA.

Explanation

Boys' row arrangement: C sits in the center (3rd position). A sits to his left at the 2nd position. D sits between B and C at the 4th position, placing B at the 5th position. E occupies the remaining 1st position. The boys sit in the sequence: E, A, C, D, B.

Girls' row arrangement (sitting opposite the boys): T sits opposite B at the 5th position. T is to the left of S, placing S at the 4th position. P sits between Q and R, placing P at the 1st position, opposite E.

Therefore, P is sitting opposite E.

Explanation

A is the brother of B, and B is the father of C, which makes A the paternal uncle of C. Since D is the wife of A, she is the wife of C's paternal uncle, making D the aunt of C.

Explanation

Each letter in the second letter-cluster is the reverse alphabetical opposite of the corresponding letter in the first cluster, where the sum of the positional values of opposite letters equals 27.

A (1) + Z (26) = 27 B (2) + Y (25) = 27 C (3) + X (24) = 27 D (4) + W (23) = 27

Applying the same logic to GHIJ: G (7) → T (20, since 27 − 7 = 20) H (8) → S (19, since 27 − 8 = 19) I (9) → R (18, since 27 − 9 = 18) J (10) → Q (17, since 27 − 10 = 17)

Explanation

Replacing the original operators according to the given conditions: '+' becomes '-' '×' becomes '+' '-' becomes '×'

The given expression 28 + (5 × 7) - (9 ÷ 6) becomes: 28 - (5 + 7) × (9 ÷ 6)

Applying BODMAS rule: Solve inside brackets: (5 + 7) = 12 and (9 ÷ 6) = 1.5 Perform multiplication: 12 × 1.5 = 18 Perform subtraction: 28 - 18 = 10

Explanation

Coal is a non-renewable, exhaustible natural resource and a fossil fuel formed over millions of years from decaying organic matter. Once consumed, it cannot be replenished on a human timescale, unlike renewable energy sources.

Explanation

'Obey' and 'Disobey' are antonyms (words opposite in meaning). Following the same relationship, the direct antonym of 'Appoint' (to officially select someone for a job or position) is 'Dismiss' (to officially remove someone from a job or position).

Explanation

According to the rules of categorical syllogisms, when two universal affirmative statements are connected through a common middle term in the form "All A are B" and "All B are C", the valid transitive conclusion is "All A are C". Substituting A = voters, B = citizens, and C = loyalists directly yields "All voters are loyalists".

Explanation

The proverb 'a little knowledge is a dangerous thing' emphasizes that having a partial or superficial understanding of a subject can create false confidence. Acting on incomplete information often leads to mistaken assumptions, flawed decisions, and unintended harm.

Explanation

The given series consists of the squares of consecutive odd positive integers:

1² = 1 3² = 9 5² = 25 7² = 49 9² = 81

Following this pattern, the next odd integer is 11, and its square is 11² = 121.

Explanation

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

A (1) + Z (26) = 27 E (5) + V (22) = 27 J (10) + Q (17) = 27

Applying the same relationship to BFK:

B (2) + Y (25) = 27 F (6) + U (21) = 27 K (11) + P (16) = 27

This yields the cluster YUP.

Explanation

A compass is a navigational instrument used for finding directions or a geometry tool for drawing circles, whereas the rest are laboratory apparatus used to handle liquids in scientific experiments.

Explanation

The code is formed by adding the forward alphabetical positions of all the letters in the word.

For PENINSULA: P(16) + E(5) + N(14) + I(9) + N(14) + S(19) + U(21) + L(12) + A(1) = 111

Applying the same logic to DICHOTOMY: D(4) + I(9) + C(3) + H(8) + O(15) + T(20) + O(15) + M(13) + Y(25) = 112

Explanation

In each row, calculate the difference between the sum of the outer numbers (1st and 4th columns) and the sum of the inner numbers (2nd and 3rd columns):

Row 1: (14 + 8) - (12 + 10) = 22 - 22 = 0 Row 2: (10 + 4) - (8 + 2) = 14 - 10 = 4 Row 3: (8 + 16) - (14 + 6) = 24 - 20 = 4

Following the symmetric pattern of differences (0, 4, 4, 0), the difference for Row 4 is 0:

(12 + ?) - (18 + 14) = 0 12 + ? = 32 ? = 32 - 12 = 20

Explanation

By categorical syllogism, combining the universal affirmative premise 'All horses are mammals' with the universal negative premise 'No mammals are amphibians' yields the universal negative conclusion 'No horses are amphibians'. By the logical rule of conversion for E-type (universal negative) statements, 'No horses are amphibians' logically converts to 'No amphibians are horses'.

Explanation

The given series consists of consecutive prime numbers ending with the unit digit 3.

The terms in the sequence are prime numbers ending in 3: 3, 13, 23, 43, 53, 73, 83, 103, and 113. Composite numbers ending in 3, such as 33, 63, and 93, are excluded from the pattern.

To find the missing term after 113, we check the next numbers ending in 3: 123 is divisible by 3, 133 is divisible by 7, 143 is divisible by 11, and 153 is divisible by 3. The next prime number ending with the digit 3 is 163.