Number/Letter Series MCQs for LDC
Practice 20 free Number/Letter Series questions under Mental Ability — Reasoning & Mental Ability.
Strengthen your Number/Letter Series knowledge for LDC with curated MCQs. Switch between Hindi and English anytime.
LDC — Mental Ability — Number/Letter Series
20 Questions • Instant results & explanations • Hindi & English
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Question 1 of 20
If a series alternately increases and decreases, but the difference between consecutive terms is small, which operations are alternating?
Question 2 of 20
What can be the constituent elements of a reasoning series puzzle?
Question 3 of 20
If a sequence is formed by calculating the cubes of natural numbers, what mathematical operation would theoretically reverse the process to find the original base number from the sequence term?
Question 4 of 20
If the values in a series are decreasing very rapidly, which operation is most likely occurring?
Question 5 of 20
Assertion (A): In the series 2, 3, 5, 7, 11, the next term must be 13. Reason (R): The series consists of prime numbers starting from 2.
Question 6 of 20
Match List-I (Example Series) with List-II (Underlying Logic) and choose the correct code: List-I a. 1, 4, 9, 16, 25, 36 b. 2, 3, 5, 7, 11, 13 List-II 1. Prime numbers starting from 2 2. Squares of natural numbers
Question 7 of 20
In the series 1, 4, 9, 16, ?, 36, what is the missing term and what rule does it follow?
Question 8 of 20
In number puzzles, besides a rapid increase indicating multiplication or a positive power, what other operations might accompany it?
Question 9 of 20
What mathematical pattern governs a series where values increase and decrease alternately, but the difference between consecutive terms remains relatively small?
Question 10 of 20
If a student observes a number puzzle where values first increase and then decrease by large margins consecutively, what should they investigate first?
Question 11 of 20
Assertion (A): Achieving proficiency in number puzzle questions requires maximum practice. Reason (R): Different mathematical operations like addition, division, squares, etc., can be applied differently across different questions.
Question 12 of 20
What is the very first step required to find a missing term in a number puzzle or diagram?
Question 13 of 20
Assertion (A): A series displaying numbers 2, 3, 5, 7, 11 shows an addition of constant values between terms. Reason (R): 3-2=1, 5-3=2, 7-5=2, 11-7=4 does not yield a constant added value, indicating the series rule is prime numbers instead.
Question 14 of 20
When the values in a number series are decreasing at a normal rate, the underlying operation is generally:
Question 15 of 20
According to the principles of number puzzles, what is the best method to gain proficiency in solving these questions?
Question 16 of 20
Match List-I (Change Dynamic) with List-II (Core Operation) based on number puzzle rules: List-I a. Rapid Value Decay b. Simple Value Growth c. Alternate minor fluctuations List-II 1. Addition/Subtraction alternately 2. Division 3. Addition
Question 17 of 20
Assertion (A): The mathematical operation applied to find a missing term in a number puzzle is always identical across all puzzles of that category. Reason (R): Different puzzles involve different mathematical operations, requiring specific identification for each individual case.
Question 18 of 20
Which specific combinations of alternate operations are classified strictly based on the magnitude of change (rapid vs. small) in the sequence?
Question 19 of 20
Consider the following statements regarding diagram-based number puzzles: I. Numbers filled in a diagram follow a specific rule. II. The operations required to find the missing term are usually entirely different from standard arithmetic like addition, subtraction, or squares. Which of the statements given above is/are correct?
Question 20 of 20