The “Top 30 Logical Reasoning and Mental Ability MCQs for OSSC CGL” is designed to help candidates prepare effectively for the Odisha Staff Selection Commission’s Combined Graduate Level examination. These multiple-choice questions encompass various aspects of logical reasoning and mental ability, including puzzles, syllogisms, coding-decoding, series, analogies, and data interpretation. Each question is meticulously crafted to challenge the candidates’ analytical and critical thinking skills, ensuring they are well-prepared for the logical reasoning section of the OSSC CGL exam. The solutions provided offer clear and concise explanations to enhance understanding and aid in effective learning.
Top 30 Logical Reasoning and Mental Ability MCQs For OSSC CGL
- Question: If A is the brother of B, B is the sister of C, and C is the father of D, how is D related to A?
A. Father
B. Nephew/Niece
C. Brother
D. Cousin
Answer: B. Nephew/Niece
Solution: A is the brother of B, and B is the sister of C, so A is the uncle of D because C is D’s father. - Question: Find the next number in the series: 2, 6, 12, 20, ___.
A. 28
B. 30
C. 32
D. 36
Answer: B. 30
Solution: The differences between the numbers are 4, 6, 8, and so on. The next difference should be 10. Thus, 20 + 10 = 30. - Question: If in a code language, ‘APPLE’ is written as ‘ELPPA’, how is ‘ORANGE’ written in that code?
A. EGNARO
B. EGRONA
C. NOGARE
D. GONARE
Answer: A. EGNARO
Solution: The code reverses the letters of the word. - Question: What comes next in the sequence? J, F, M, A, M, ___.
A. J
B. A
C. S
D. O
Answer: A. J
Solution: These are the first letters of the months of the year: January, February, March, April, May, June. - Question: In a family of six members P, Q, R, S, T, and U, there are two married couples. P is a teacher and the father of R. U is the grandfather of R and is a lawyer. Q is the mother of R. S is the grandmother of R. T is the brother of R How is T related to U?
A. Son
B. Daughter
C. Son-in-law
D. Grandson
Answer: A. Son
Solution: U and S are grandparents. P and Q are the parents of R, making T the son of U. - Question: Select the word which is different from the rest:
A. Car
B. Bicycle
C. Bus
D. Train
E. Airplane
Answer: B. Bicycle
Solution: Bicycle is the only one that is not motorized. - Question: Find the odd one out:
A. 24
B. 36
C. 72
D. 168
E. 144
Answer: B. 36
Solution: 36 is the only number that is not divisible by 24. - Question: Pointing to a photograph, a man says, “She is the daughter of my grandfather’s only son.” How is the girl in the photograph related to the man?
A. Mother
B. Aunt
C. Sister
D. Cousin
Answer: C. Sister
Solution: The man’s grandfather’s only son is his father, so the girl is his sister. - Question: If ‘SUNDAY’ is coded as ‘HFMWZB’, how will ‘MONDAY’ be coded?
A. NOXBYF
B. FONXAY
C. NLMWZB
D. ZINXBY
Answer: C. NLMWZB
Solution: Each letter is replaced by the letter which is opposite to it in the alphabet. - Question: A clock is set right at 12 noon. It loses 10 minutes in 24 hours. What will be the correct time when the clock indicates 3 PM on the 4th day?
A. 2.20 PM
B. 1 PM
C. 4 PM
D. 12 PM
Answer: A. 2.20 PM
Solution: The clock loses 10 minutes every 24 hours, so in 4 days it loses 40 minutes. Thus, when the clock shows 3 PM, it is actually 2 PM. - Question: If ‘MOTHER’ is coded as ‘QSXLIV’, then ‘FATHER’ will be coded as?
A. JTHXYW
B. JSHXYW
C. JEXLIV
D. JSHXYB
Answer: C. JEXLIV
Solution: Each letter is replaced by the letter four positions ahead in the alphabet. - Question: Which words are not formed from this word ‘RABBIT’ to form a meaningful word.
A. RAT
B. BAT
C. BAG
D. BIT
Answer: C. BAG
Solution: The correct arrangement of the letters forms is not in the word ‘BAG’. - Question: What is the missing number in the sequence: 3, 6, 11, 18, 27, ___?
A. 34
B. 36
C. 38
D. 30
Answer: C. 38
Solution: The differences between numbers are consecutive odd numbers (3, 5, 7, 9, 11). - Question: A boy is walking towards the north. After a while, he turns 90° to his right and walks straight. Again he turns 90° to his right and walks straight. In which direction is he walking now?
A. South
B. East
C. West
D. North
Answer: A. South
Solution: He started north, turned east, and then turned south. - Question: If 2x – 3y = 12 and x/y = 3/4, what is the value of x and y?
A. x = 6, y = 9
B. x = 6, y = 8
C. x = 4, y = 3
D. x = 8, y = 4
Answer: B. x = 6, y = 8
Solution: By solving the equations, we get x = 6, y = 8 - Question: Which one of the following is not a leap year:
A. 1618
B. 1700
C. 1800
D. 2000
Answer: .A. 1618
Solution: 1618 is not a leap year as it is not divisible by 4. - Question: If the day before yesterday was Thursday, what will be the day after tomorrow?
A. Friday
B. Saturday
C. Sunday
D. Monday
Answer: D. Monday
Solution: If the day before yesterday was Thursday, today is Saturday, and the day after tomorrow is Monday. - Question: Select the word which is different from the rest:
A. Square
B. Circle
C. Triangle
D. Rectangle
Answer: B. Circle
Solution: Circle is the only shape without straight sides. - Question: Find the odd one out:
A. 125
B. 343
C. 729
D. 1331
E. 2197
Answer: C. 729
Solution: 729 is 9^3, while the others are cubes of prime numbers. - Question: If in a certain code, ‘GOVERNMENT’ is written as ‘JRYHUQPHQW’, how is ‘DEVELOPMENT’ written in that code?
A. GHYHORSPHQW
B. IRJYHQFANBO
C. IRJYHQFNNBO
D. IRJYHQFBABO
Answer: A. GHYHORSPHQW
Solution: Each letter is replaced by the letter Two positions ahead in the alphabet. - Question: Which one of the following letters should replace the question mark in the series: A, D, G, J, M, ?
A. O
B. P
C. Q
D. R
Answer: D. P
Solution: The series follows a pattern of skipping two letters: A (skip B, C), D (skip E, F), G (skip H, I), J (skip K, L), M (skip N, O), P. - Question: If 7+6=1, 9+8=5, 8+4=0, then 9+3=?
A. 2
B. 1
C. 0
D. 8
Answer: C. 0
Solution: The pattern is the sum minus 12. (7+6)-12=1, (9+8)-12=5, (8+4)-12=0, (9+3)-12=0. - Question: Choose the number which is different from the rest:
A. 18
B. 27
C. 32
D. 45
Answer: C. 32
Solution: All numbers except 32 are divisible by 9. - Question: If ‘BOOK’ is coded as ‘DOOL’, then how is ‘PEN’ coded?
A. RON
B. POE
C. ROE
D. REO
Answer: D. REO
Solution: Each letter is replaced by the letter two positions ahead in the alphabet. Vowels remain unchanged - Question: Find the next term in the series: A, C, F, J, O, ___.
A. S
B. T
C. U
D. V
Answer: C. U
Solution: The series increases by 1, 2, 3, 4, and 5 letters respectively. - Question: Which word cannot be formed using the letters of the word ‘CORPORATION’?
A. PORT
B. NATION
C. RATION
D. ACTION
Answer: B. NATION
Solution: The word ‘NATION’ requires 2 ‘N’s, but ‘CORPORATION’ has only one ‘N’. - Question: A is B’s sister. C is B’s mother. D is C’s father. E is D’s mother. How is A related to E?
A. Great Granddaughter
B. Granddaughter
C. Daughter
D. Great Great Granddaughter
Answer: A. Great Granddaughter
Solution: A is the great-granddaughter of E. - Question: Which one of the following is different from the other three?
A. Dog
B. Lion
C. Tiger
D. Leopard
Answer: A. Dog
Solution: Dog is the only domestic animal, while the others are wild animals. - Question: Select the one which is different from the other three responses:
A. Pigeon
B. Parrot
C. Sparrow
D. Bat
Answer: D. Bat
Solution: Bat is a mammal, whereas the others are birds. - Question: If ‘+’ means ‘÷’, ‘÷’ means ‘-‘, ‘-‘ means ‘×’, and ‘×’ means ‘+’, what is 10 + 5 ÷ 5 – 3 × 2?
A. 2
B. 4
C. 6
D. 8
Answer: B. 4
Solution: 10 ÷ 5 – 5 + 3 + 2 = 4.
