Series Completion MCQ – Reasoning Questions and Answers

1. Complete the series: A, E, I, ?, U

a) O

b) M

c) Q

d) S

Answer:

a) O

Explanation:

The series consists of vowels in alphabetical order.

2. Find the missing number: 2, 4, 6, ?, 10

a) 7

b) 8

c) 9

d) 11

Answer:

b) 8

Explanation:

The series is increasing by 2 each time.

3. Complete the series: Cat, Dog, ?, Cow

a) Horse

b) Lion

c) Elephant

d) Fox

Answer:

a) Horse

Explanation:

The series consists of common domestic animals.

4. Identify the missing letter: J, L, N, ?, R

a) O

b) P

c) Q

d) S

Answer:

b) P

Explanation:

The series is skipping one letter in the alphabet each time.

5. Complete the series: 3, 9, 27, 81, ?

a) 162

b) 243

c) 324

d) 405

Answer:

b) 243

Explanation:

Each number is multiplied by 3.

6. Find the next word: Apple, Banana, ?, Date

a) Cherry

b) Coconut

c) Cantaloupe

d) Carrot

Answer:

a) Cherry

Explanation:

The series consists of fruits in alphabetical order.

7. Complete the series: 10, 20, 30, ?, 50

a) 35

b) 40

c) 45

d) 55

Answer:

b) 40

Explanation:

The series is increasing by 10 each time.

8. Identify the missing letter: B, D, F, ?, J

a) G

b) H

c) I

d) K

Answer:

b) H

Explanation:

The series consists of alternate letters in the alphabet.

9. Complete the series: Red, Blue, ?, Green

a) Yellow

b) Orange

c) Purple

d) Indigo

Answer:

a) Yellow

Explanation:

The series consists of primary colors.

10. Find the missing number: 5, 10, 15, ?, 25

a) 18

b) 20

c) 22

d) 30

Answer:

b) 20

Explanation:

The pattern is adding 5 each time.

11. Complete the series: Lion, Tiger, ?, Wolf

a) Dog

b) Bear

c) Leopard

d) Elephant

Answer:

c) Leopard

Explanation:

The series consists of large carnivorous mammals.

12. Identify the missing letter: A, C, E, ?, I

a) F

b) G

c) H

d) J

Answer:

b) G

Explanation:

The series is skipping one letter in the alphabet.

13. Complete the series: 2, 4, 8, 16, ?

a) 24

b) 28

c) 32

d) 36

Answer:

c) 32

Explanation:

Each number is doubled.

14. Find the next word: January, February, ?, April

a) March

b) May

c) June

d) July

Answer:

a) March

Explanation:

The series consists of months in order.

15. Complete the series: Circle, Triangle, Square, ?

a) Hexagon

b) Rectangle

c) Pentagon

d) Octagon

Answer:

c) Pentagon

Explanation:

The series follows shapes with increasing numbers of sides.

16. Identify the missing number: 11, 22, 33, ?, 55

a) 40

b) 44

c) 48

d) 66

Answer:

b) 44

Explanation:

The pattern is adding 11 each time.

17. Complete the series: Monday, Tuesday, ?, Thursday

a) Friday

b) Saturday

c) Sunday

d) Wednesday

Answer:

d) Wednesday

Explanation:

The series consists of days of the week in order.

18. Find the missing letter: T, R, P, ?, L

a) N

b) O

c) Q

d) S

Answer:

a) N

Explanation:

The series is skipping one letter in reverse alphabetical order.

19. Complete the series: 100, 90, 80, ?, 60

a) 65

b) 70

c) 75

d) 85

Answer:

b) 70

Explanation:

The series is decreasing by 10 each time.

20. Identify the next word: Sunflower, Rose, ?, Lily

a) Daisy

b) Orchid

c) Tulip

d) Violet

Answer:

c) Tulip

Explanation:

The series consists of popular flowers.

21. Complete the series: 1, 1, 2, 3, 5, ?

a) 7

b) 8

c) 9

d) 10

Answer:

b) 8

Explanation:

This is the Fibonacci sequence, where each number is the sum of the two preceding ones.

22. Find the missing number: 7, 14, 21, ?, 35

a) 25

b) 28

c) 30

d) 32

Answer:

b) 28

Explanation:

The series is increasing by 7 each time.

23. Complete the series: Dog, Cat, ?, Rabbit

a) Horse

b) Mouse

c) Bird

d) Fish

Answer:

b) Mouse

Explanation:

The series consists of common household pets.

24. Identify the missing letter: Q, S, U, ?, Y

a) V

b) W

c) X

d) Z

Answer:

b) W

Explanation:

The series consists of alternate letters in the alphabet.

25. Complete the series: 9, 16, 25, 36, ?

a) 45

b) 49

c) 64

d) 81

Answer:

b) 49

Explanation:

The series is square numbers. 7^2 = 49.

26. Find the next word: Copper, Silver, ?, Platinum

a) Gold

b) Iron

c) Lead

d) Zinc

Answer:

a) Gold

Explanation:

The series consists of common metals in increasing value.

27. Complete the series: 3, 6, 9, 12, ?

a) 14

b) 15

c) 16

d) 18

Answer:

b) 15

Explanation:

The series is increasing by 3 each time.

28. Identify the missing letter: Z, X, V, ?, R

a) U

b) T

c) S

d) Q

Answer:

b) T

Explanation:

The series is skipping one letter in reverse alphabetical order.

29. Complete the series: Spring, Summer, ?, Winter

a) Autumn

b) Fall

c) Monsoon

d) Spring

Answer:

a) Autumn

Explanation:

The series consists of seasons in order.

30. Find the missing number: 1, 4, 9, ?, 25

a) 15

b) 16

c) 18

d) 20

Answer:

b) 16

Explanation:

The series is square numbers. 4^2 = 16.

31. Complete the series: Bear, Lion, Tiger, ?

a) Elephant

b) Wolf

c) Zebra

d) Giraffe

Answer:

b) Wolf

Explanation:

The series consists of large carnivorous mammals.

32. Identify the missing letter: L, N, P, ?, T

a) Q

b) R

c) S

d) U

Answer:

b) R

Explanation:

The series consists of alternate letters in the alphabet.

33. Complete the series: 15, 30, 45, 60, ?

a) 70

b) 75

c) 80

d) 85

Answer:

b) 75

Explanation:

The series is increasing by 15 each time.

34. Find the next word: Honda, Toyota, ?, Ford

a) BMW

b) Chevrolet

c) Nissan

d) Volkswagen

Answer:

c) Nissan

Explanation:

The series consists of popular car brands.

35. Complete the series: 2, 3, 5, 7, 11, ?

a) 12

b) 13

c) 14

d) 15

Answer:

b) 13

Explanation:

The series consists of prime numbers.

36. Identify the missing letter: C, F, I, ?, O

a) K

b) L

c) M

d) N

Answer:

c) M

Explanation:

The series is skipping two letters in the alphabet each time.

37. Complete the series: 4, 8, 16, 32, ?

a) 48

b) 56

c) 64

d) 72

Answer:

c) 64

Explanation:

Each number is doubled.

38. Find the next word: Pen, Pencil, ?, Marker

a) Eraser

b) Notebook

c) Ruler

d) Crayon

Answer:

d) Crayon

Explanation:

The series consists of common writing or drawing tools.

39. Complete the series: 25, 50, 75, 100, ?

a) 115

b) 125

c) 150

d) 200

Answer:

b) 125

Explanation:

The series is increasing by 25 each time.

40. Identify the missing letter: V, T, R, ?, N

a) Q

b) P

c) O

d) M

Answer:

b) P

Explanation:

The series is skipping one letter in reverse alphabetical order.

41. Complete the series: January, March, May, ?, September

a) June

b) July

c) August

d) October

Answer:

b) July

Explanation:

The series consists of alternate months.

42. Find the missing number: 2, 6, 12, 20, ?

a) 26

b) 30

c) 35

d) 40

Answer:

b) 30

Explanation:

The pattern is n(n+1).

43. Complete the series: Rose, Daisy, Tulip, ?, Lily

a) Orchid

b) Sunflower

c) Carnation

d) Violet

Answer:

c) Carnation

Explanation:

The series consists of popular flowers.

44. Identify the missing letter: A, D, G, ?, M

a) I

b) J

c) K

d) L

Answer:

b) J

Explanation:

The series is skipping two letters in the alphabet each time.

45. Complete the series: 1, 2, 4, 8, 16, ?

a) 24

b) 32

c) 48

d) 64

Answer:

b) 32

Explanation:

Each number is doubled.

46. Find the next word: Oak, Pine, Maple, ?

a) Birch

b) Cedar

c) Willow

d) Spruce

Answer:

a) Birch

Explanation:

The series consists of types of trees.

47. Complete the series: 10, 13, 16, 19, ?

a) 21

b) 22

c) 23

d) 24

Answer:

b) 22

Explanation:

The series is increasing by 3 each time.

48. Identify the missing letter: K, M, O, ?, S

a) P

b) Q

c) R

d) T

Answer:

c) R

Explanation:

The series consists of alternate letters in the alphabet.

49. Complete the series: 36, 30, 24, 18, ?

a) 12

b) 14

c) 16

d) 20

Answer:

a) 12

Explanation:

The series is decreasing by 6 each time.

50. Find the next word: Copper, Bronze, Silver, ?

a) Gold

b) Iron

c) Steel

d) Platinum

Answer:

a) Gold

Explanation:

The series consists of metals historically used in coinage, in increasing value.