Logical Reasoning for SSC CGL: Important Questions and Explanations

Logical reasoning is an essential part of the SSC CGL exam, testing a candidate's ability to analyze patterns, understand relationships, and solve problems efficiently. Here, we will discuss some important logical reasoning questions along with simple explanations to help you prepare effectively.

1. Number Series

Question: Find the missing number: 2, 6, 12, 20, ?, 42
Options:
A) 30
B) 28
C) 32
D) 36

Answer: B) 30
Explanation: The pattern follows +4, +6, +8, +10... So, 20 + 10 = 30

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2. Blood Relation

Question: Pointing to a boy, Rita said, "He is the son of my grandfather’s only son." How is the boy related to Rita?
Options:
A) Brother
B) Cousin
C) Nephew
D) Uncle

Answer: A) Brother
Explanation: Grandfather’s only son is Rita’s father. His son is her brother.

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3. Odd One Out

Question: Find the odd one out:
Options:
A) Apple
B) Mango
C) Potato
D) Banana

Answer: C) Potato
Explanation: All others are fruits, but potato is a vegetable.

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4. Direction Sense

Question: A man walks 10m North, turns right and walks 5m, then turns right again and walks 10m. In which direction is he now facing?
Options:
A) East
B) West
C) North
D) South

Answer: B) West
Explanation: He initially faced North, then East, then South. Now he faces West.

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5. Coding-Decoding

Question: If CAT is coded as 3120, how will DOG be coded?
Options:
A) 4150
B) 4815
C) 4740
D) 4950

Answer: C) 4740
Explanation: Each letter’s position in the alphabet is multiplied:
C (3 × 1), A (1 × 2), T (20 × 1) → 3120
D (4 × 1), O (15 × 2), G (7 × 1) → 4740

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6. Syllogism

Question: Statements:

1. All cats are animals.

2. Some animals are wild.

Conclusion:
A) Some cats are wild.
B) All animals are cats.

Options:
A) Only A follows
B) Only B follows
C) Both follow
D) None follow

Answer: D) None follow
Explanation: The given statements do not guarantee that some cats are wild or that all animals are cats.

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7. Mirror Image

Question: What will be the mirror image of 1234 in a vertical mirror?
Options:
A) 4321
B) 2143
C) 1234
D) 3412

Answer: A) 4321
Explanation: The order of digits reverses in a mirror image.

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8. Calendar Problem

Question: If 15th August 2023 was a Tuesday, what day will 15th August 2024 be?
Options:
A) Wednesday
B) Thursday
C) Friday
D) Saturday

Answer: B) Thursday
Explanation: 2024 is a leap year, so the extra day shifts it by 2 days.

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9. Puzzle-Based Question

Question: A is the father of B, but B is not the son of A. Who is B?
Options:
A) Brother
B) Daughter
C) Uncle
D) Cousin

Answer: B) Daughter
Explanation: If B is not the son, then B must be the daughter.

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10. Clock-Based Question

Question: What is the angle between the hands of the clock at 3:30?
Options:
A) 75°
B) 90°
C) 105°
D) 120°

Answer: C) 105°
Explanation: The formula is |(30×H - 5.5×M)|
= |(30×3 - 5.5×30)| = |90 - 82.5| = 105°

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Conclusion

Logical reasoning is an important section of the SSC CGL exam, and practicing different types of questions will help improve problem-solving skills. By understanding these fundamental concepts and practicing regularly, candidates can enhance their reasoning abilities and score well in the exam. Keep practicing and stay confident!