SSC CHSL Tier 1 2015 General Intelligence & Reasoning Questions with Solutions

Explanation

According to the given instructions, we substitute the mathematical operators as follows:

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

Applying these substitutions to the given expression: (30 + 20) - 5(7 ÷ 3) x 25

We get: (30 - 20) × 5 × (7 + 3) ÷ 25

First, evaluate the expressions inside the parentheses: 30 - 20 = 10 7 + 3 = 10

Substituting these values back, we have: 10 × 5 × 10 ÷ 25

Following the BODMAS rule: 10 × 5 = 50 50 × 10 = 500 500 ÷ 25 = 20

Explanation

The word THESIS cannot be formed from the letters of POLYTHEISM because it contains the letter S twice, whereas the word POLYTHEISM contains the letter S only once.

Explanation

The word PATENT cannot be formed because it contains the letter T twice, whereas the original word EMANCIPATE contains only a single T.

Explanation

Applying the decoded operations to the given mathematical expression: is replaced by × × is replaced by + ÷ is replaced by -

• is replaced by ÷

Substituting these symbols into the expression: 12 - 8 × 6 - 4 ÷ 6 + 3 we get: 12 × 8 + 6 × 4 - 6 ÷ 3

Following the BODMAS rule (Division, Multiplication, Addition, Subtraction):

First, perform the division operation: 6 ÷ 3 = 2 The expression becomes: 12 × 8 + 6 × 4 - 2

Next, perform the multiplication operations: 12 × 8 = 96 6 × 4 = 24 The expression becomes: 96 + 24 - 2

Finally, perform the addition and subtraction: 96 + 24 = 120 120 - 2 = 118

Explanation

The sum of the numbers in each row and each column is equal to 132. Thus, the missing values are 46, 40, and 45 because 42 + 44 + 46 = 132 and 47 + 40 + 45 = 132, which also makes the column sums 48 + 44 + 40 = 132 and 41 + 46 + 45 = 132.

Explanation

The pattern followed in each column of the grid is: (Row 2 + Row 3) × Row 1 = Row 4

For the first column: (6 + 7) × 5 = 13 × 5 = 65

For the second column: (3 + 2) × 4 = 5 × 4 = 20

Applying this pattern to the third column, let the missing number be x: (x + 4) × 9 = 45 x + 4 = 5 x = 1

Explanation

The number 166 is a composite number because it is an even number divisible by 2, whereas the other numbers in the set are all prime numbers.

Explanation

The letter group XYZ consists of consecutive alphabetical letters with a common difference of 1 between their numerical positions (X = 24, Y = 25, Z = 26), which is different from the pattern of alternating letters with a common difference of 2 in the other groups.

Explanation

In the pair Water : Tap, the first element is not the source of energy, fuel, or sustenance required for the second element to function. In the other pairs, the second element requires the first element as its source of power or survival to function, whereas a tap is simply a device used to regulate or dispense water and does not rely on water as its operating fuel. This makes it the odd one out.

Explanation

Photosynthesis is a physiological process or biological pathway through which green plants synthesize nutrients. The remaining alternatives are all physical chemical entities, namely elements, compounds, or biological pigments, making the biological process the odd one out.

Explanation

The number 215 is represented as 6³ - 1, whereas the other numbers in the set follow the pattern of n³ + 1. Specifically, 28 is 3³ + 1, 65 is 4³ + 1, and 126 is 5³ + 1.

Explanation

Option A is the odd one out because it does not follow the general mathematical pattern where the digits represent a starting digit x, followed by 3 × x and then 5 × x concatenated together. Starting with the first digit 5, the pattern should yield 5, then 5 × 3 = 15, and finally 5 × 5 = 25, forming the number 51525. Instead, the given number ends with 30, violating this sequence.

Explanation

In the letter group RQCB, the two pairs of letters are written in reverse alphabetical order, where R is followed by Q (a step of -1) and C is followed by B (a step of -1). In the rest of the letter groups, the pairs are written in the standard forward alphabetical order, with a step of +1 between consecutive letters.

Explanation

In the alphabetical series, the standard pattern followed by the letter groups is +4, -1, and +4.

For the group IMNR, the alphabetical positions are I = 9, M = 13, N = 14, and R = 18. The differences between the consecutive letters are: 9 + 4 = 13 (I to M) 13 + 1 = 14 (M to N) 14 + 4 = 18 (N to R)

This yields a pattern of +4, +1, and +4, which deviates from the standard pattern where the second transition should decrease the position by 1. Therefore, this group is the odd one out.

Explanation

Arunachal Pradesh is a landlocked state situated in the northeastern frontier of India, sharing international boundaries with Bhutan, Myanmar, and China. Unlike the other states in the given list, it does not possess any coastline along the Arabian Sea.

Explanation

The sequence is based on the differences between consecutive terms, which increase by 7 at each step.

The difference between the first and second term is: 30 - 16 = 14

The difference between the fourth and fifth term is: 114 - 79 = 35

This indicates that the differences between successive terms form an arithmetic progression with a common difference of 7, which are 14, 21, 28, and 35.

Adding the next difference of 21 to the second term gives the missing term: 30 + 21 = 51

To verify, adding the subsequent difference of 28 to this term yields the fourth term: 51 + 28 = 79

Explanation

The given sequence is an alternating series consisting of two interleaved sub-series.

The first sub-series consists of terms at odd positions (1st, 3rd, 5th, and 7th terms): 1, 4, 7, 10 This follows an arithmetic progression with a constant difference of +3: 1 + 3 = 4 4 + 3 = 7 7 + 3 = 10

The second sub-series consists of terms at even positions (2nd, 4th, 6th, and 8th terms): 48, 24, ?, 2 This series decreases by dividing each subsequent term by consecutive integers (2, 3, 4): 48 ÷ 2 = 24 24 ÷ 3 = 8 8 ÷ 4 = 2

Applying this logic, the missing number at the 6th position is 8.

Explanation

The given letter series follows a pattern where each subsequent letter is obtained by moving two positions backward in the English alphabet. The numerical positions of the letters are: T is 20, R is 18, P is 16, and N is 14. Subtracting 2 from 14 gives 12, which corresponds to the letter L.

Explanation

The given sequence follows the pattern where each term is twice the previous term plus one. Using the relation:

Tₙ = 2 × Tₙ₋₁ + 1

For the first term, T₁ = 4: T₂ = 2 × 4 + 1 = 9

Applying the same relation to the remaining terms confirms the pattern: T₃ = 2 × 9 + 1 = 19 T₄ = 2 × 19 + 1 = 39 T₅ = 2 × 39 + 1 = 79 T₆ = 2 × 79 + 1 = 159

Explanation

The letters in the given series are arranged in a descending alphabetical order with a constant difference of two positions between consecutive letters.

By representing each letter with its corresponding position in the English alphabet, where A = 1, B = 2, and so on up to Z = 26, the sequence corresponds to the following numerical values: Z = 26 X = 24 V = 22 T = 20 R = 18 N = 14

The pattern represents a subtraction of 2 at each step: 26 - 2 = 24 24 - 2 = 22 22 - 2 = 20 20 - 2 = 18 18 - 2 = 16 16 - 2 = 14

The letter corresponding to the numerical value of 16 is P.

Explanation

Let Jais's present age be J and his father's present age be F.

Since their age difference is 35 years, we have: F - J = 35

After 5 years, each of them will be 5 years older, making the sum of their ages: (J + 5) + (F + 5) = 125 J + F + 10 = 125 J + F = 115

Adding the two equations: (F - J) + (J + F) = 35 + 115 2F = 150 F = 75

Substituting F = 75 into the equation F - J = 35 gives: 75 - J = 35 J = 40

To find their ages after 12 years from now: Jais's age after 12 years = 40 + 12 = 52 Father's age after 12 years = 75 + 12 = 87

Explanation

Correct Answer: D

The letter series can be divided into five groups of three letters each. The pattern follows an alternating sequence of abc and its reverse cba:

abc | cba | abc | cba | abc

By placing the letters a, b, c, and c from the option sequentially into the gaps, we get:

a b c | c b a | a b c | c b a | a b c

This perfectly completes the repeating pattern.

Explanation

Comparing the words letter by letter to arrange them in alphabetical order:

The fourth letter of each word is: For Extemporize (2) and Extermination (4), it is e. For Extinction (3) and Extinguisher (5), it is i. For Extortioner (1), it is o.

Since e comes before i, which comes before o, the e-words come first, followed by the i-words, and then the o-word.

Comparing the fifth letters of the e-words: In Extemporize (2), the fifth letter is m. In Extermination (4), the fifth letter is r. Since m comes before r, 2 comes before 4.

Comparing the sixth letters of the i-words: In Extinction (3), the sixth letter is c. In Extinguisher (5), the sixth letter is g. Since c comes before g, 3 comes before 5.

The o-word Extortioner (1) comes at the end.

Combining these sequences yields the complete dictionary order: 2, 4, 3, 5, 1.

Explanation

To arrange the words in alphabetical order as they appear in a dictionary, compare the letters from left to right:

All four words begin with Lau.

Comparing the fourth letters of each word, Laughter has g, while Launderette, Laundry, and Launch have n. Since g comes before n, Laughter (2) is the first word.

Comparing the remaining words Launderette, Laundry, and Launch at their fifth letters, Launch has c, while Launderette and Laundry have d. Since c comes before d, Launch (4) is the second word.

Comparing the sixth letters of the remaining two words, Launderette has e, while Laundry has r. Since e comes before r, Launderette (1) is the third word, leaving Laundry (3) as the last word.

This yields the sequence 2, 4, 1, 3.

Explanation

To arrange the words in alphabetical order as they appear in a dictionary, we compare them letter by letter from left to right.

All four words begin with the prefix compli. Comparing the sixth letter of each word: In Compliant, the sixth letter is a. In Complicate, Complicity, and Complication, the sixth letter is c. Since a comes before c, Compliant (4) is the first word in the alphabetical order.

Next, we compare the remaining words Complicate (1), Complicity (2), and Complication (3). Looking at their seventh letters: In Complicate and Complication, the seventh letter is a. In Complicity, the seventh letter is i. Since a comes before i, Complicity (2) is positioned after the other two, making it the last word in the sequence.

Finally, we compare Complicate (1) and Complication (3). The first eight letters complicat are identical in both words. Looking at their ninth letters: In Complicate, the ninth letter is e. In Complication, the ninth letter is i. Since e comes before i, Complicate (1) comes before Complication (3).

Combining these steps yields the final alphabetical order: Compliant (4), Complicate (1), Complication (3), and Complicity (2).

Explanation

The letters of the first word RORRIM are written in reverse order to form the word MIRROR. Applying the same logic, reversing the letters of the word TNESERP from right to left yields the word PRESENT.

Explanation

The relationship between the numbers is based on the rearrangement of their digits according to their original positions.

In the first pair, the digits of 12593 are rearranged to form 35291. By mapping the positions of the digits from left to right as 1st, 2nd, 3rd, 4th, and 5th, the new number is formed by placing them in the order of 5th, 3rd, 2nd, 4th, and 1st. For 12593: 1st digit is 1, 2nd is 2, 3rd is 5, 4th is 9, and 5th is 3. Rearranging them in the order 5th-3rd-2nd-4th-1st yields 35291.

In the second pair, applying the same positional transformation of 5th-3rd-2nd-4th-1st to 29684: The digits are rearranged to yield 46982.

Applying this exact positional rearrangement to the number 72936: The 5th digit is 6, the 3rd digit is 9, the 2nd digit is 2, the 4th digit is 3, and the 1st digit is 7. Arranging them in the pattern of 5th-3rd-2nd-4th-1st results in 69237.

Explanation

The logic followed in the analogy is to square the first number and then divide it by 2 to obtain the second number. This can be represented by the formula:

y = x² ÷ 2

Substituting x = 6 into the formula: 6² ÷ 2 = 36 ÷ 2 = 18

Applying the same formula to the next term where x = 4: 4² ÷ 2 = 16 ÷ 2 = 8

Explanation

Logic is the fundamental tool and methodology used to derive, validate, and establish truths and principles in mathematics. Similarly, experiments are the fundamental tool and methodology used to observe, test, and establish truths and laws in science.

Explanation

The logic of the analogy is based on adding a constant value of 6 to the alphabetical position of each letter in the first group to get the corresponding letter in the second group.

In the first pair EAC : KGI: E (5th letter) + 6 = K (11th letter) A (1st letter) + 6 = G (7th letter) C (3rd letter) + 6 = I (9th letter)

Applying this same relationship to HDF: H (8th letter) + 6 = N (14th letter) D (4th letter) + 6 = J (10th letter) F (6th letter) + 6 = L (12th letter)

This results in the letter combination NJL.

Explanation

The relationship in the first pair is that of a whole and its constituent part, where a window is composed of individual panes. Similarly, in the second pair, a book is composed of individual pages, making page the constituent part of a book.

Explanation

The relationship in the given pair is that of an object and its components that radiate from its central hub. A fan is structurally composed of wings projecting outwards from the center to perform its function. Similarly, a wheel is composed of spokes, which are the rods or bars that radiate outwards from the central hub to the outer rim to provide support and structure.

Explanation

In the first number 4845, the first and last digits are 4 and 5, which combine to form the number 45. The second number 452 is formed by taking these digits 45 and appending the digit 2 (representing the square, 45²).

Following the same logic for 5964, the first and last digits are 5 and 4, which combine to form the number 54. Appending the digit 2 to 54 gives 542.

Explanation

The letters of the word BUT are reversed to form the word TUB. Following the same pattern, reversing the letters of the word NET yields the word TEN.

Explanation

Let the initial direction in which the journey started be D.

The sequence of turns made during the journey is: Walked 200 m in the initial direction D. Turned right, which is a 90 degree clockwise turn. Turned left, which is a 90 degree counter-clockwise turn.

The net change in direction is 90 degrees clockwise minus 90 degrees counter-clockwise, which equals 0 degrees.

This means the final direction of movement is the same as the initial direction D. Since the final facing direction is North, the initial direction of the journey was also North.

Explanation

Following the rule of representing a letter first by its row and then by its column, the letters of the word DEBRIS are represented as follows:

D is located at row 4, column 0 in Matrix I, giving 40. E is located at row 9, column 5 in Matrix II, giving 95. B is located at row 1, column 4 in Matrix I, giving 14. R is located at row 5, column 8 in Matrix II, giving 58. I is located at row 3, column 4 in Matrix I, giving 34. S is located at row 6, column 9 in Matrix II, giving 69.

Combining these representations yields the set 40, 95, 14, 58, 34, 69.

Explanation

The coding pattern involves splitting the six-letter word into two halves of three letters each and reversing the order of letters within each half.

For the word MOTHER, the first half MOT is reversed to TOM, and the second half HER is reversed to REH, resulting in TOMREH.

Applying this same logic to the word NEPHEW, the first half NEP is reversed to PEN, and the second half HEW is reversed to WEH. Combining these two halves yields PENWEH.

Explanation

Let the starting point be represented by the coordinates (0, 0) on a Cartesian plane. Walking 3 km North reaches the position (0, 3). Turning East and walking 4 km reaches the position (4, 3). Turning West and walking 2 km back along the same path reaches the position (2, 3), facing West. Turning left, which is South, and walking 3 km reaches the final position of (2, 0). Comparing this final position (2, 0) with the starting point (0, 0) shows that Raheja is located exactly 2 km to the East of his starting point.

Explanation

The advertisement specifically urges readers to consume "pure organic honey" of Company A. Highlighting the "pure organic" nature of the product implies that other forms of honey, such as impure or artificial honey, exist and can be prepared or sold in the market. Since the advertisement contains no information regarding the price of the honey or the spending behavior of the consumers, the assumption about people not minding paying more does not follow. Therefore, only the first assumption is implicit.

Explanation

Adam is 20 years old and is 4 times as old as Mary, which means Mary's current age is 20 ÷ 4 = 5 years. The difference between their ages is 20 - 5 = 15 years, which remains constant over time.

Let M represent Mary's age when Adam is twice as old as her. At that time, Adam's age will be 2M. Since their age difference is always 15 years:

2M - M = 15 M = 15

Explanation

The given code maps digits 0 to 9 to letters a to j sequentially: a = 0, b = 1, c = 2, d = 3, e = 4, f = 5, g = 6, h = 7, i = 8, j = 9.

Converting the terms in the expression baf ÷ bf × d to their numerical values: baf represents the number 105 bf represents the number 15 d represents the number 3

Substituting these values into the expression gives: 105 ÷ 15 × 3

According to the order of operations, division is performed before multiplication: 105 ÷ 15 = 7 7 × 3 = 21

Converting the result 21 back to the corresponding code: 2 corresponds to c 1 corresponds to b Therefore, 21 is coded as cb.

Explanation

Each letter of the word is shifted backward by 3 positions in alphabetical order to form its code.

For PRAYER: P minus 3 is M, R minus 3 is O, A minus 3 is X, Y minus 3 is V, E minus 3 is B, and R minus 3 is O.

Applying the same logic to SALUTE: S minus 3 is P, A minus 3 is X, L minus 3 is I, U minus 3 is R, T minus 3 is Q, and E minus 3 is B.

Explanation

The given statement establishes that students go to school in uniforms as a universal behavior. For a practice to be uniformly observed by all students of an institution, it must be a mandatory requirement. Therefore, the fact that students wear uniforms to school logically implies that uniforms are compulsory.

Explanation

The word GARBAGE cannot be formed using the letters of HARBINGER because GARBAGE requires two Gs and two As, whereas the word HARBINGER contains only one G and one A.

Explanation

The word TENDER can be formed because all of its constituent letters, namely T, E, N, D, E, and R, are present in the master word ENDEARMENT. Specifically, ENDEARMENT contains three Es, two Ns, one D, one R, and one T, which is more than sufficient to fulfill the requirement of one T, two Es, one N, one D, and one R to construct the word TENDER.

Explanation

The word is represented by the sum of the numerical positions of its individual letters in the English alphabet, where A = 1, B = 2, C = 3, and so on.

For the word BOY: B = 2 O = 15 Y = 25 Sum = 2 + 15 + 25 = 42

Applying this logic to the word GIRL: G = 7 I = 9 R = 18 L = 12 Sum = 7 + 9 + 18 + 12 = 46

Explanation

The relationship between the numbers in the first pair follows the mathematical pattern where the first number x is multiplied by its succeeding number (x + 1) to obtain the second number.

For the first pair: 6 × (6 + 1) = 6 × 7 = 42

Using the same logic for the second pair: 5 × (5 + 1) = 5 × 6 = 30

This pattern can also be represented as x² + x: 6² + 6 = 36 + 6 = 42 5² + 5 = 25 + 5 = 30

Explanation

The relationship represented in the analogy is between a sport and the country where it is traditionally recognized as the national game. Field hockey is traditionally associated with India as its national sport, while baseball is historically and widely celebrated as the national sport and national pastime of the USA.

Explanation

Ant, fly, and bee form a group of insects. Similarly, hamster and squirrel belong to the rodent family. Among the given options, mouse is also a rodent, which completes this group.

Explanation

The relationship between the numbers in each pair is defined by taking the square root of the first number and adding 1 to get the second number.

For the first pair: √144 + 1 = 12 + 1 = 13

Applying this same relationship to the second pair: √49 + 1 = 7 + 1 = 8