Practice 30 SSC CGL Classification MCQs with answers and detailed explanations. Master classification questions with powerful shortcuts and exam-focused practice.
SSC CGL Classification MCQs
1. Find the odd one out.
A) 16 B) 25
C) 36 D) 63
Answer: D) 63
Explanation:
16 = 4²
25 = 5²
36 = 6²
63 is not a perfect square.
∴, 63 is the odd one out.
2. Find the odd pair.
A) 7 : 49 B) 9 : 81
C) 11 : 121 D) 13 : 156
Answer: D) 13 : 156
Explanation:
In the first three pairs, the second number is the square of the first:
7² = 49
9² = 81
11² = 121
But:
13² = 169, not 156.
∴13: 156 is different.
3. Find the odd one out.
A) 3 B) 7
C) 13 D) 21
Answer: D) 21
Explanation:
3, 7 and 13 are prime numbers.
21 = 3 × 7, so it is a composite number.
Hence, 21 is the odd one out.
4. Find the odd one out.
A) 121 B) 144
C) 169 D) 198
Answer: D) 198
Explanation:
These are consecutive squares:
11² = 121
12² = 144
13² = 169
14² = 196, not 198
5. Find the odd one out.
- A) 8 B) 27 C) 64 D) 100
Answer: D) 100
Explanation:
8 = 2³
27 = 3³
64 = 4³
But 100 is not a perfect cube
∴100 is the odd one out
SSC CGL Classification MCQs
6. Find the odd one out.
A) AZ B) BY
C) CX D) DU
Answer: D) DU
Explanation:
Using alphabet positions:
A = 1, Z = 26 → 1 + 26 = 27
B = 2, Y = 25 → 27
C = 3, X = 24 → 27
D = 4, U = 21 → 25
The first three pairs have a total of 27.
∴, DU is different.
7. Find the odd one out.
A) ACE B) BDF
C) CEG D) DFI
Answer: D) DFI
Explanation:
In the first three groups, letters increase by 2:
ACE → A, C, E
BDF → B, D, F
CEG → C, E, G
But DFI → D, F, I.
The difference is 2 and then 3.
∴DFI is the odd group.
7. Find the odd one out.
A) CAT B) DOG
C) COW D) EAGLE
Answer: D) EAGLE
Explanation:
CAT, DOG and COW have 3 letters each.
EAGLE has 5 letters.
Hence, EAGLE is the odd one out.
9. Find the odd one out.
A) January B) March
C) May D) June
Answer: D) June,
Explanation:
January, March and May have 31 days.
June has 30 days.
∴ June is different.
10. Find the odd one out.
A) Triangle B) Square
C) Rectangle D) Circle
Answer: D) Circle
Explanation:
Triangle, square and rectangle are polygons made up of straight-line segments.
A circle has a curved boundary.
Hence, Circle is the odd one out.
11. Find the odd one out.
A) 14 B) 28
C) 42 D) 55
Answer: D) 55
Explanation:
14, 28 and 42 are multiples of 14:
14 × 1 = 14
14 × 2 = 28
14 × 3 = 42
55 is not divisible by 14.
∴55 is the odd one out.
12. Find the odd one out.
A) 17 B) 19
C) 23 D) 27
Answer: D) 27
Explanation:
17, 19 and 23 are prime numbers
27 = 3³ and is composite
Thus, 27 is the odd one out
SSC CGL Classification MCQs
13. Find the odd one out.
A) 2 : 8 B) 3 : 27
C) 4 : 64 D) 5 : 100
Answer: D) 5 : 100
Explanation:
The relationship in the first three is:
2³ = 8
3³ = 27
4³ = 64
∴ for 5:
5³ = 125, not 100
Hence, 5 : 100 is the odd pair
SSC CGL Classification MCQs
14. Find the odd one out.
A) 18 B) 27
C) 36 D) 52
Answer: B) 27
Explanation:
18, 36 and 45 are divisible by 9 and 2
But 27 is divisible by 3 but not 2
15. Find the odd one out.
A) 81 B) 100
C) 121 D) 150
Answer: D) 150
Explanation:
81 = 9²
100 = 10²
121 = 11²
150 is not a perfect square
∴ 150 is the odd one out
16. Find the odd pair.
A) 12 : 144 B) 15 : 625
C) 18 : 324 D) 21 : 441
Answer: B) 15 : 625
Explanation:
All pairs follow:
Second number = square of first number
12² = 144
15² = 225, not 625
18² = 324
21² = 441
SSC CGL Classification MCQs
17. Find the odd one out.
A) 2, 6, 12 B) 3, 9, 18
C) 4, 12, 24 D) 5, 15, 35
Answer: D) 5, 15, 35
Explanation:
For the first three:
A: 2 × 1, 2 × 3, 2 × 6 → 2, 6, 12
B: 3 × 1, 3 × 3, 3 × 6 → 3, 9, 18
C: 4 × 1, 4 × 3, 4 × 6 → 4, 12, 24
The third number should be 5 × 6 = 30, but the option gives 35.
∴ 5, 15, 35 is the odd group.
18. Find the odd one out.
A) AB B) CD
C) EF D) GI
Answer: D) GI
Explanation:
AB → consecutive letters
CD → consecutive letters
EF → consecutive letters
G and I have H between them, so they are not consecutive
∴ GI is the odd pair
19. Find the odd one out.
A) 1, 4, 9 B) 4, 9, 16
C) 9, 16, 25 D) 16, 25, 49
Answer: D) 16, 25, 49
Explanation:
Every group consists of three consecutive perfect squares:
1² = 1, 2² = 4, 3² = 9
2² = 4, 3² = 9, 4² = 16
3², 4², 5²
4² = 16, 5² = 25, 6² = 36 , not 49
∴ 16, 25, 49 is odd one out
20. Find the odd one out.
A) Mercury B) Venus
C) Earth D) Moon
Answer: D) Moon
Explanation:
Mercury, Venus and Earth are planets.
The Moon is Earth’s natural satellite.
∴ Moon is the odd one out.
SSC CGL Classification MCQs
21. Find the odd one out.
A) 31 B) 37
C) 41 D) 51
Answer: D) 51
Explanation:
31, 37 and 41 are prime numbers
51 = 3 × 17, so it is composite
∴ 51 is the odd one out
22. Find the odd one out.
A) 22 B) 33
C) 44 D) 57
Answer: D) 57
Explanation:
22 = 11 × 2
33 = 11 × 3
44 = 11 × 4
The first three are multiples of 11
57 is not divisible by 11
Hence, 57 is the odd one out
SSC CGL Classification MCQs
23. Find the odd one out.
A) 6 B) 12
C) 20 D) 32
Answer: D) 32
Explanation:
6 = 2 × 3
12 = 3 × 4
20 = 4 × 5
The pattern is n (n + 1)
Next would be:
5 × 6 = 30
But the option D) gives 32
∴ 32 is the odd one out
SSC CGL Classification MCQs
24. Find the odd one out.
A) ACEG B) BDFH
C) CEGI D) DFHK
Answer: D) DFHK
Explanation:
Each group contains letters with a difference of 2:
ACEG → A, C, E, G
BDFH → B, D, F, H
CEGI → C, E, G, I
DFHK → D, F, H, J
DFHK not follow the same pattern
25. Find the odd one out.
A) 121 : 11 B) 144 : 12
C) 169 : 13 D) 196 : 15
Answer: D) 196 : 15
Explanation:
The second number is the square root of the first:
√121 = 11
√144 = 12
√169 = 13
√196 = 14, not 15
∴ 196 : 15 is the odd pair
26. Find the odd one out.
A) 8 : 64 B) 9 : 81
C) 11 : 121 D) 12 : 132
Answer: D) 12 : 132
Explanation:
First three:
8² = 64
9² = 81
11² = 121
But 12² = 144, not 132
∴ 12 : 132 is the odd pair
27. Find the odd one out.
A) 2, 3, 5 B) 3, 5, 7
C) 5, 7, 11 D) 7, 9, 11
Answer: D) 7, 9, 11
Explanation:
The first three groups consist entirely of prime numbers.
In the fourth group:
7 → prime
9 → composite
11 → prime
∴ 7, 9, 11 is the odd group
28. Find the odd one out.
A) Monday B) Tuesday
C) Wednesday D) Sunday
Answer: D) Sunday
Explanation:
This question requires identifying the intended classification carefully.
Monday, Tuesday and Wednesday are weekdays.
Sunday is generally classified as a weekend day.
Hence, Sunday is the odd one out.
SSC CGL Classification MCQs
29. Find the odd one out.
A) 123 B) 234
C) 345 D) 468
Answer: D) 468
Explanation:
In the first three numbers, digits increase consecutively:
123 → 1, 2, 3
234 → 2, 3, 4
345 → 3, 4, 5
But 468 → 4, 6, 8, where digits increase by 2.
∴ 468 is the odd one out.
30. Find the odd one out.
A) 15 B) 35
C) 56 D) 75
Answer: C) 56
Explanation:
All four numbers end in 5 and are divisible by 5
15 = 5 × 3
35 = 5 × 7
75 = 5 × 15
55 = 5 × 11, not 56
∴ 56 is odd one out
SSC CGL Classification MCQs
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