Logical Reasoning Quiz 1

Logical Reasoning Quiz – Concept Booster

In competitive exams, reasoning questions are designed to test your analytical thinking skills rather than your memory. Regular practice of a Logical Reasoning Quiz can help you recognize common patterns in topics such as odd one out, coding-decoding, number and alphabet series, blood relations, analogies, mirror images, and logical sequences.

To perform well in reasoning sections, focus on understanding the logic behind each question, identify recurring patterns, and practice solving questions within a time limit. Developing strong reasoning skills can improve both your speed and accuracy in competitive examinations.

Question 1:

Find the odd one out?

❌ A. Apple
❌ B. Mango
❌ C. Banana
✅ D. Carrot

Explanation:

To solve an Odd One Out question, identify the common category shared by most of the options. In this question, Apple, Mango, and Banana are all fruits. They belong to the same group because they are commonly classified as edible fruits.

Carrot, however, is a root vegetable and belongs to a different category. Since three options are fruits and one option is a vegetable, Carrot does not fit with the others and is therefore the odd one out.

Preparation Tip: In logical reasoning questions, always look for a common relationship such as category, function, characteristic, or usage. The option that differs from the common pattern is usually the correct answer.

Answer: ✅ D. Carrot

Question 2:

If CAT = 3120, then DOG = ?

❌ A. 4127
✅ B. 4157
❌ C. 4147
❌ D. 4137

Explanation:

This question is based on the alphabetical position of letters.

First, observe the pattern in CAT = 3120:

• C = 3 (3rd letter of the alphabet)
• A = 1 (1st letter of the alphabet)
• T = 20 (20th letter of the alphabet)

So, the code is formed by writing the alphabetical positions of each letter consecutively.

Now apply the same pattern to DOG:

• D = 4 (4th letter)
• O = 15 (15th letter)
• G = 7 (7th letter)

Combining these values:
DOG = 4 15 7 = 4157

Preparation Tip: In coding-decoding questions, always check whether the code is based on:

• Alphabetical positions (A=1, B=2, C=3, …)
• Reverse alphabetical positions (Z=1, Y=2, …)
• Addition or subtraction patterns
• Rearrangement of letters or numbers

Memorizing the positions of common letters can help solve coding-decoding questions quickly in competitive exams.

Answer: ✅ B. 4157

Question 3:

Which comes next: 5, 10, 20, 40, ?

❌ A. 45
❌ B. 60
✅ C. 80
❌ D. 100

Explanation:

This is a number series question based on a multiplication pattern.

Observe the relationship between the numbers:

• 5 × 2 = 10
• 10 × 2 = 20
• 20 × 2 = 40

Following the same pattern:

• 40 × 2 = 80

Therefore, the next number in the series is 80.

Preparation Tip: When solving number series questions, check for common patterns such as:

• Addition or subtraction
• Multiplication or division
• Squares or cubes
• Alternating patterns
• Increasing or decreasing differences

Identifying the pattern quickly through regular practice can improve your speed and accuracy in competitive exams.

Answer: ✅ C. 80

Question 4:

A is the sister of B. B is the brother of C. C is the father of D. A is ______ of D.

❌ A. Mother
❌ B. Father
✅ C. Aunt
❌ D. Sister

Explanation:

Let’s analyze the relationships step by step:

• A is the sister of B, so A and B are siblings.
• B is the the brother of C, which means B and C are also siblings.
• Therefore, A and C are siblings.
• C is the father of D, which means D is the child of C.

Since A is the sister of D’s father (C), A is D’s aunt.

A simple family tree representation:

      A      B      C
      |______|______|
               |
               D

Preparation Tip: In blood relation questions, solve the problem one relationship at a time and, if needed, draw a simple family tree or diagram. This helps avoid confusion and improves accuracy in competitive exams.

Answer: ✅ C. Aunt

Question 5:

Find the mirror image of 3?

❌ A. 3
✅ B. Ɛ
❌ C. ∑
❌ D. E

Explanation:

A mirror image is formed when an object is reflected across a vertical mirror line. When the number 3 is viewed in a mirror, its shape appears reversed, resembling the symbol Ɛ.

• 3 does not remain the same after reflection.
• ∑ is a mathematical symbol and does not represent the mirror image of 3.
• E is an alphabet and is unrelated to the mirror reflection of the number 3.

Therefore, the correct mirror image of 3 is Ɛ.

Preparation Tip: In mirror image questions, imagine placing a mirror on the right side of the figure and observe how the image reverses horizontally. Regular practice with numbers, alphabets, and symbols can help you solve mirror image questions quickly in competitive exams.

Answer: ✅ B. Ɛ

Question 6:

Clock : Time :: Thermometer : ?

✅ A. Temperature
❌ B. Weather
❌ C. Heat
❌ D. Degree

Explanation:

This is an analogy question. In analogy problems, identify the relationship between the first pair of words and apply the same relationship to the second pair.

• A Clock is an instrument used to measure or show Time.
• Similarly, a Thermometer is an instrument used to measure Temperature.

Let’s check the other options:

• Weather is a general atmospheric condition, not what a thermometer directly measures.
• Heat is a form of energy and is different from temperature.
• Degree is a unit used to express temperature, not the quantity being measured.

Therefore, the correct analogy is:

Clock : Time :: Thermometer : Temperature

Preparation Tip: In analogy questions, ask yourself:

• Is it a tool → function relationship?
• Is it a part → whole relationship?
• Is it a cause → effect relationship?
• Is it a person → profession or object → purpose relationship?

Identifying the relationship type first makes analogy questions much easier to solve.

Answer: ✅ A. Temperature

Question 7:

Which word does not belong?

❌ A. Pen
❌ B. Pencil
❌ C. Eraser
✅ D. Book

Explanation:

To solve an Odd One Out question, identify the common function shared by most of the options.

• Pen, Pencil, and Eraser are all writing and drawing tools used for writing, sketching, and correcting mistakes.
• Book, however, is not a writing tool. It is a reading and learning material used to store information.

Since Book belongs to a different category, it does not fit with the other three options.

Preparation Tip: In odd-one-out questions, try grouping the options based on:

• Function or usage
• Category or type
• Physical characteristics
• Relationship or purpose

Finding the common link among three options usually helps identify the odd one quickly.

Answer: ✅ D. Book

Question 8:

Find the missing letter: A, D, G, J, ?

❌ A. K
✅ B. M
❌ C. L
❌ D. N

Explanation:

This question is based on the alphabetical sequence pattern.

Let’s look at the positions of the letters in the English alphabet:

• A = 1
• D = 4
• G = 7
• J = 10

Observe the pattern:

• 1 + 3 = 4
• 4 + 3 = 7
• 7 + 3 = 10

Following the same pattern:

• 10 + 3 = 13

The 13th letter of the English alphabet is M.

Therefore, the missing letter in the sequence is M.

Preparation Tip: In alphabet series questions, convert the letters into their alphabetical positions (A=1, B=2, C=3, …) and check for patterns such as:

• Equal increments or decrements
• Alternate sequences
• Reverse order patterns
• Skip-letter patterns

This method helps solve alphabet series questions quickly and accurately in competitive exams.

Answer: ✅ B. M

Question 9:

If SOUTH is written as HTUOS, then NORTH is?

❌ A. HTTRON
✅ B. HTRON
❌ C. HTORN
❌ D. HTRNO

Explanation:

This question is based on the reverse order of letters.

Observe the given example:

• SOUTH → HTUOS

The word SOUTH is simply written in reverse order:

• S O U T H → H T U O S

Now apply the same rule to NORTH:

• N O R T H → H T R O N

Therefore, NORTH is written as HTRON.

Preparation Tip: In coding-decoding questions, first check for simple patterns such as:

• Reversing the word
• Alphabetical positions
• Addition or subtraction of letter values
• Rearrangement of letters
• Alternate letter patterns

Always test the simplest pattern first, as many competitive exam questions use straightforward logic.

Answer: ✅ B. HTRON

Question 10:

1 : 3 :: 3 : ?

❌ A. 6
❌ B. 7
✅ C. 9
❌ D. 12

Explanation:

This question is based on a number analogy.

Observe the relationship between the first pair:

• 1 → 3
• Here, 1 is multiplied by 3:
  • 1 × 3 = 3

Now apply the same pattern to the second pair:

• 3 × 3 = 9

Therefore, the number related to 3 is 9.

Let’s verify the options:

• 6 = Incorrect
• 7 = Incorrect
• 9 = Correct
• 12 = Incorrect

Preparation Tip: In number analogy questions, check for common mathematical operations such as:

• Addition (+)
• Subtraction (−)
• Multiplication (×)
• Division (÷)
• Squares and cubes
• Ratio or proportional relationships

Always identify the relationship in the first pair before applying it to the second pair.

Answer: ✅ C. 9

Authority Reference: To understand the fundamentals of logical thinking and reasoning, refer to the NCERT Class 11 Mathematics – Mathematical Reasoning chapter published by NCERT.