Number/Letter Series MCQs for LDC
Practice 20 free number/letter series multiple choice questions for LDC exam. Instant answers, explanations in Hindi and English, and topic-wise targeted practice.
Master Number/Letter Series under Mental Ability for LDC with our curated MCQ set. Every question is sourced from real Rajasthan exam patterns and updated regularly. Switch between Hindi and English anytime. Use this daily to strengthen weak areas before the exam.
LDC — Mental Ability — Number/Letter Series
20 Questions • Instant results & explanations • Hindi & English
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Question 1 of 20
Assertion (A): A series where values decrease very rapidly implies alternate addition and subtraction. Reason (R): Rapid decreases in series values are primarily caused by division operations.
Question 2 of 20
What is the primary analytical significance of observing the rate of change (normal vs. rapid) when deciphering a number series?
Question 3 of 20
Which specific combinations of alternate operations are classified strictly based on the magnitude of change (rapid vs. small) in the sequence?
Question 4 of 20
Assertion (A): A numerical series where numbers decrease rapidly is generally governed primarily by the subtraction operation. Reason (R): Subtraction naturally causes a normal rate of decrease, whereas division is responsible for a rapid rate of decrease.
Question 5 of 20
If a missing term in a visual diagram puzzle is to be found, what must one do immediately after identifying the mathematical rule the other numbers follow?
Question 6 of 20
When the values in a number series are decreasing at a normal rate, the underlying operation is generally:
Question 7 of 20
Match List-I (Sequence Type) with List-II (Underlying Logic) and choose the correct code: List-I a. 1, 4, 9, 16 b. 2, 3, 5, 7 c. 10, 8, 6, 4 List-II 1. Normal Decrease (Subtraction) 2. Squares of Natural Numbers 3. Prime Numbers
Question 8 of 20
Consider the following statements regarding the behavior of number series: I. If the numbers grow rapidly, the rule must strictly be a pure multiplication without any other accompanying operation. II. If the numbers grow rapidly, the rule involves multiplication (or positive power), which might also be accompanied by addition or subtraction. Which of the statements is/are correct?
Question 9 of 20
A student encounters a diagram puzzle with missing numbers. Based on standard guidelines, which mathematical operations might they expect to employ?
Question 10 of 20
In the sequence 1, 4, 9, 16, 25, 36, the underlying mathematical operation involves:
Question 11 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 12 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 13 of 20
In the series 1, 4, 9, 16, ?, 36, what is the missing term and what rule does it follow?
Question 14 of 20
Match List-I (Visual Change in Series) with List-II (Underlying Mathematical Operation) and select the correct answer: List-I a. Rapid Increase b. Normal Increase c. Small alternate fluctuations List-II 1. Addition 2. Alternate Addition & Subtraction 3. Multiplication or Positive Power
Question 15 of 20
If a mathematical sequence begins with 2, 3, 5, 7, 11, what is the primary mathematical characteristic identifying this specific progression?
Question 16 of 20
In number puzzles, besides a rapid increase indicating multiplication or a positive power, what other operations might accompany it?
Question 17 of 20
Consider the following statements regarding number series: I. A normal rate of increase suggests an addition-based series. II. A normal rate of decrease suggests a subtraction-based series. Which of the statements given above is/are correct?
Question 18 of 20
Assertion (A): When a numerical series shows alternating rapid increases and rapid decreases, it indicates a combination of addition and subtraction. Reason (R): Rapid changes in series values are primarily driven by multiplication and division operations.
Question 19 of 20
If the numbers in a series are increasing at a normal rate, which mathematical operation is the series most likely based on?
Question 20 of 20