SSC CHSL Tier 1 2025 General Intelligence & Reasoning Questions with Solutions

Explanation

The sequence follows a pattern where the difference between consecutive terms increases by a constant value of 1.5.

The differences between successive terms are: 7.5 - 5 = 2.5 11.5 - 7.5 = 4 17 - 11.5 = 5.5

The differences are 2.5, 4, and 5.5, which form an arithmetic progression with a common difference of 1.5.

Following this pattern, the next difference is: 5.5 + 1.5 = 7

Adding this difference to the last term gives the next number in the sequence: 17 + 7 = 24

Explanation

The series follows a repeating pattern of the five-letter sequence b c d g a.

By dividing the given series of fifteen letters into three groups of five letters each, we get: b _ d g a | _ c _ _ a | b c d g _

To make each group identical to the pattern b c d g a, the missing letters in the blanks must be filled in order as follows: First blank: c (to complete b c d g a) Second blank: b (to start the second group _ c _ _ a) Third blank: d (to continue the second group) Fourth blank: g (to complete the second group b c d g a) Fifth blank: a (to complete the third group b c d g _)

Thus, the sequence of letters to fill the blanks is c, b, d, g, a.

Explanation

The relationship in the analogy represents a part-to-whole relationship. An engine is an essential component of a car, required for its operation. Similarly, a keyboard is an essential input device and integral part of a computer system, used to input data and interact with the system.

Explanation

The relation in the given analogy follows the pattern where the second number is the cube of the first number, represented by the formula y = x³.

For the first pair, 6³ = 216.

Applying the same formula to the second pair, 5³ = 125.

Explanation

The number 72 is a non-perfect square, whereas the other numbers in the group are all perfect squares of integers. Specifically, 16 is 4², 49 is 7², and 81 is 9².

Explanation

To find the Least Common Multiple (LCM) of 8, 12, and 18, we use the prime factorization method: 8 = 2³ 12 = 2² × 3 18 = 2 × 3²

Taking the highest power of each prime factor involved: LCM = 2³ × 3² = 8 × 9 = 72.

Explanation

The given series follows the pattern of n² - 1, where n is a sequence of decreasing natural numbers starting from 11.

Calculating each term using this formula: 11² - 1 = 121 - 1 = 120 10² - 1 = 100 - 1 = 99 9² - 1 = 81 - 1 = 80 8² - 1 = 64 - 1 = 63 7² - 1 = 49 - 1 = 48 6² - 1 = 36 - 1 = 35

Alternatively, the difference between consecutive terms decreases by consecutive odd numbers: 120 - 21 = 99 99 - 19 = 80 80 - 17 = 63 63 - 15 = 48 48 - 13 = 35

According to both patterns, the fourth term should be 63 instead of 65. Thus, 65 is the incorrect term in the series.

Explanation

The series is formed by repeating the block 'xyz':

• Block 1: x y z
• Block 2: x y z
• Block 3: x y z

The same three-letter block repeats, so the next block is also "xyz" (Option D).

Explanation

The sequence consists of two parts: a letter and a number.

For the letter part, the terms increase by two positions in the English alphabet. A (1st letter) → C (3rd letter) → E (5th letter) → G (7th letter) → I (9th letter) Following this pattern, the next letter is the 11th letter of the alphabet, which is K.

For the number part, the terms are the squares of consecutive positive integers. 1² = 1 2² = 4 3² = 9 4² = 16 5² = 25 Following this pattern, the next number is 6² = 36.

Combining the letter and number parts gives the next term as K36.

Explanation

A printer is classified as an output device because it receives data from a computer and represents it in a physical form, such as text or graphics on paper. This function of sending data out of the system distinguishes it from devices that feed data and control signals into a computer.

Explanation

Japan is an independent sovereign nation, whereas the others are constituent states of India.

Explanation

The letters in the sequence can be represented by their numerical positions in the English alphabet: C = 3 F = 6 J = 10 O = 15 U = 21

The differences between successive terms are: 6 - 3 = 3 10 - 6 = 4 15 - 10 = 5 21 - 15 = 6

The difference increases by 1 at each step. Following this pattern, the next difference must be 7.

Adding 7 to the position of U: 21 + 7 = 28

Since there are 26 letters in the alphabet, the positions wrap around: 28 - 26 = 2

The second letter of the alphabet is B.

Explanation

The series follows a pattern where the differences between consecutive terms form an arithmetic progression with a common difference of 12.

The differences between the consecutive terms are: 15 - 3 = 12 39 - 15 = 24

Following this sequence of differences (12, 24, 36, 48, ...), the next difference must be 36.

Adding 36 to the third term gives: 39 + 36 = 75

To verify, adding the next difference of 48 to 75 gives: 75 + 48 = 123

Alternatively, the general term of this quadratic series can be represented by the formula Tₙ = 6n² - 6n + 3. For the fourth term (n = 4), the calculation is: T₄ = 6(4)² - 6(4) + 3 = 96 - 24 + 3 = 75

Explanation

According to the rules of syllogism and immediate inference, a universal positive proposition of the form "All A are B" can be logically converted to a particular positive proposition "Some B are A". Since the first premise states that "All pens are tools", it naturally and necessarily follows that "Some tools are pens".

Explanation

The terms of the series increase by consecutive multiples of 100. Calculating the differences between successive terms reveals the pattern:

499 - 199 = 300 899 - 499 = 400 1399 - 899 = 500 1999 - 1399 = 600

The differences form an arithmetic progression of 300, 400, 500, 600, where each successive difference increases by 100. Following this pattern, the next difference must be 700.

Adding 700 to the last term of the series gives the next number:

1999 + 700 = 2699

Explanation

When a journey covers equal distances at two different speeds, say v₁ and v₂, the average speed for the entire journey is given by the harmonic mean formula:

Average Speed = 2v₁v₂ / (v₁ + v₂)

Given that the onward speed v₁ = 45 km/hr and the return speed v₂ = 30 km/hr, substituting these values into the formula yields:

Average Speed = 2 × 45 × 30 / (45 + 30) Average Speed = 2700 / 75 Average Speed = 36 km/hr

Explanation

The given sequence 7, 12, 17, 22, ... is an arithmetic progression with the first term a = 7 and the common difference d = 12 - 7 = 5.

The n-th term of an arithmetic progression is given by the formula: Tₙ = a + (n - 1)d

Substitute the given values Tₙ = 152, a = 7, and d = 5 into the formula: 152 = 7 + (n - 1) × 5 145 = (n - 1) × 5 n - 1 = 145 ÷ 5 n - 1 = 29 n = 30

Explanation

Each letter in the sequence of terms is incremented by one position in alphabetical order to obtain the corresponding letter of the subsequent term.

The first letters follow the pattern: A → B → C → D The second letters follow the pattern: C → D → E → F The third letters follow the pattern: F → G → H → I The fourth letters follow the pattern: H → I → J → K

Combining these letters gives the next term in the sequence as DFIK.

Explanation

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

B + 2 = D A + 2 = C T + 2 = V

Applying this same rule to the word PEN:

P + 2 = R E + 2 = G N + 2 = P

This gives the coded word RGP.

Explanation

The sequence follows a cumulative alphabetical pattern where each subsequent term is formed by adding the next consecutive letter of the English alphabet to the preceding term.

The first term is A. The second term adds B to get AB. The third term adds C to get ABC. The fourth term adds D to get ABCD. The fifth term adds E to get ABCDE.

Following this consistent pattern, the sixth term is formed by adding the letter F to the fifth term, resulting in ABCDEF.

Explanation

By converting the letters of the series into their corresponding numerical positions in the alphabet where A = 1, B = 2, and so on, we get the sequence: 2, 5, 9, 14, 20.

The differences between consecutive terms in this numerical sequence are: 5 - 2 = 3 9 - 5 = 4 14 - 9 = 5 20 - 14 = 6

The differences are increasing by 1 at each step. Following this pattern, the next difference must be 7.

Adding 7 to the last term gives: 20 + 7 = 27

Since there are 26 letters in the alphabet, we wrap around by subtracting 26: 27 - 26 = 1

The letter corresponding to the numerical position 1 is A.

Explanation

The series follows a specific positional addition pattern for each letter in the cluster:

First letter: B → C → D → E (increases by 1) Second letter: D → E → F → G (increases by 1) Third letter: F → I → L → O (increases by 3) Fourth letter: H → K → N → Q (increases by 3)

Applying these rules to the last cluster DFLN gives the next cluster as EGOQ.

Explanation

The coding pattern reverses the spelling of the word from right to left. Reversing the word MANGO gives OGNAM. Applying the same rule to the word PLATE, reversing the order of its letters results in ETALP.

Explanation

Using the work equivalence formula, the total work is constant and is represented by the product of the number of men and the number of days:

M₁ × D₁ = M₂ × D₂

Substituting the given values into the formula: 12 × 10 = M₂ × 6

Solving for M₂: 120 = 6 × M₂ M₂ = 120 / 6 M₂ = 20

Explanation

The series consists of groups of three consecutive letters in alphabetical order, starting from L. The sequence of letters is L (12), M (13), N (14), followed immediately by O (15), P (16), Q (17), then R (18), S (19), T (20). Following this unbroken alphabetical order, the next three consecutive letters after T are U (21), V (22), and W (23), which forms the term UVW.

Explanation

Substitute the value of b = 6 directly into the given algebraic expression:

-2b + 8 = -2(6) + 8 = -12 + 8 = -4

The variable a is not used in the calculation, as the expression only depends on b.

Explanation

The logic followed in the given analogy is that the first number in each pair is divided by 2 to obtain the second number.

108 ÷ 2 = 54

Applying the same mathematical relation to the second pair:

606 ÷ 2 = 303

Explanation

Petrol is a fossil fuel and a non-renewable source of energy. It is formed over millions of years from the decomposed remains of ancient marine organisms buried under intense heat and pressure beneath the Earth's surface, making its supply finite and depletable upon consumption.

Explanation

The series is based on a cyclic shifting pattern of a five-letter group.

The complete sequence is divided into two repeating blocks of five letters each: First block: m o n p n Second block: n m o n p

The second block is obtained by cyclically shifting the first block to the right by one position (the trailing letter n of the first block moves to the beginning of the second block).

By placing the letters of the option opnop into the blanks of the sequence m _ n _ n _ m _ n _, we get: m o n p n n m o n p

This completes the pattern perfectly.

Explanation

The ratio of shares of A, B, and C is 4:6:10.

The total sum can be calculated directly using the formula: Total sum = (Sum of ratio terms / B's ratio term) × B's share

Substituting the given values into the formula: Total sum = (4 + 6 + 10) / 6 × 1500 Total sum = 20 / 6 × 1500 Total sum = 20 × 250 Total sum = 5000

Thus, the total sum of money is Rs. 5000.

Explanation

According to the operator definitions: ÷ means +

• means × × means -

• means ÷

Substituting these operators into the given expression: 20 ÷ 4 + 6 × 32 - 8

We get: 20 + 4 × 6 - 32 ÷ 8

Applying the BODMAS rule, we first perform the division: 32 ÷ 8 = 4

Next, we perform the multiplication: 4 × 6 = 24

Finally, we perform the addition and subtraction: 20 + 24 - 4 = 40

Explanation

The coding scheme shifts each letter of the word forward by one position in the alphabetical sequence (+1 shift).

C + 1 = D H + 1 = I A + 1 = B I + 1 = J R + 1 = S

Applying this same rule to the word TABLE:

T + 1 = U A + 1 = B B + 1 = C L + 1 = M E + 1 = F

This yields the coded word UBCMF.

Explanation

To find the amount received by Y, use the ratio distribution formula.

The ratio of division among X, Y, and Z is 3:4:5.

The total number of parts in the ratio is: 3 + 4 + 5 = 12 parts

Y's share corresponds to 4 parts out of the total 12 parts.

Using the formula for proportional division: Y's share = (Y's ratio part / Total ratio parts) × Total sum

Substitute the given values: Y's share = (4 / 12) × 1800

Simplify the fraction and calculate: Y's share = 1/3 × 1800 = 600

Explanation

The logic of the analogy is the sum of the digits of the first number.

For the first pair, the sum of the digits of 246 is 2 + 4 + 6 = 12.

Applying the same logic to the second pair, the sum of the digits of 357 is 3 + 5 + 7 = 15.

Explanation

The given series is 4, 11, 22, 37, 56, ...

To find the pattern, calculate the differences between consecutive terms: 11 - 4 = 7 22 - 11 = 11 37 - 22 = 15 56 - 37 = 19

The differences between the consecutive terms are 7, 11, 15, and 19. This sequence of differences forms an arithmetic progression where each subsequent difference increases by a constant value of 4: 11 - 7 = 4 15 - 11 = 4 19 - 15 = 4

Following this pattern, the next difference in the sequence must be: 19 + 4 = 23

Adding this difference to the last term of the series gives the next number: 56 + 23 = 79

Explanation

The sequence consists of two independent patterns: a letter series and a number series.

For the letter series, B, C, E, H, ... corresponds to the alphabetical positions 2, 3, 5, 8, ... respectively. The differences between successive positions are 1 (3 − 2), 2 (5 − 3), and 3 (8 − 5). Following this pattern, the next difference is 4, which gives the letter position 8 + 4 = 12. The 12th letter of the alphabet is L.

For the number series, 27, 64, 125, 216, ... are the cubes of consecutive integers starting from 3, which are 3³, 4³, 5³, and 6³. The next number in the series is the cube of 7, which is 7³ = 343.

Combining these two patterns yields the next term as L343.

Explanation

The given series is an arithmetic progression with the first term a = 15, common difference d = 5, and the last term aₙ = 200.

The formula for the n-th term of an arithmetic progression is: aₙ = a + (n - 1)d

Substituting the given values into the formula: 200 = 15 + (n - 1) × 5 185 = (n - 1) × 5 n - 1 = 37 n = 38

Explanation

Correct Answer: D

A novel is a literary art form consisting of a written narrative in prose. It relies on language and text to convey its story and themes, whereas the other creative disciplines are classified as visual arts that produce physical, non-textual artistic works.

Explanation

In the given series, we track the position of the letter b from the left in each 8-letter term:

1st term: aaaabaaa (b is at the 5th position) 2nd term: aaaabaaa (b is at the 5th position) 3rd term: aabaaaaa (b is at the 3rd position) 4th term: abaaaaaa (b is at the 2nd position)

The number of a's preceding the letter b in each term follows the sequence 4, 4, 2, 1. This sequence is obtained by successive division: 4 ÷ 1 = 4 4 ÷ 2 = 2 2 ÷ 2 = 1

Following this pattern, the next term must have exactly 1 letter a preceding b, which corresponds to abaaaaaa.

Explanation

Each letter in the word is shifted forward by three positions in the alphabetical order.

Applying this rule to the word PLANT: P + 3 = S L + 3 = O A + 3 = D N + 3 = Q T + 3 = W

Applying the same pattern to the word CLOUD: C + 3 = F L + 3 = O O + 3 = R U + 3 = X D + 3 = G

Explanation

Cancer is a non-communicable disease that occurs due to uncontrolled cell division and growth within the body. It is not caused by infectious pathogens and cannot spread from person to person, making it distinct from communicable diseases.