Logical Reasoning is a crucial section in competitive exams like the OSSC (Odisha Staff Selection Commission) Combined Graduate Level (CGL) exam. It assesses the candidate’s ability to think logically and solve problems efficiently. To aid your preparation, here are 30 MCQs covering various logical reasoning concepts commonly tested in the OSSC CGL exam.
- How many such numerals are there in the number ‘476589326’ which will remain at the same position when arranged in ascending order from right to left?
(a) More than Four
(b) Four
(c) Two
(d) Three
(e) Zero
Answer: (e)
Explanation:
Given Number: 476589326
Ascending Order: 923456789
No number will remain in the same position. So, option (e) is correct. - If in the number 6547893241, the positions of the first and the second digit are interchanged and the position of the third and the fourth digit are interchanged and so on till the position of the ninth and the tenth digit are interchanged, then which digit will be the sixth from the left end?
(a) 7
(b) 2
(c) 1
(d) 8
(e) 4
Answer: (d)
Explanation:
Given Number: 6547893241
After Interchanging: 5768941324
Sixth from the left end is 8. So, option (d) is correct. - If in the number 9864490235, the positions of the first and the third digit are interchanged and the position of the second and the fourth digit are interchanged and the position of the sixth and the eighth digit are interchanged, then which digit will be the seventh from the left end?
(a) 3
(b) 8
(c) 1
(d) 6
(e) 0
Answer: (e)
Explanation:
Given Number: 9864490235
After Interchanging: 6894940235
Seventh from the left end is 0. So, option (e) is correct. - How many such numerals are there in the number ‘65487349289’ which will remain at the same position when arranged in descending order from left to right?
(a) More than Four
(b) Four
(c) Two
(d) Three
(e) One
Answer: (c)
Explanation:
Given Number: 65487349289
Descending Order: 98765443289
Two numerals will remain in the same position. Therefore, option (c) is correct. - If in the number 5865871475, the positions of the first and the second digit are interchanged and the position of the third and the fourth digit are interchanged and so on till the position of the ninth and the tenth digit are interchanged, then which digit will be the fourth from the right end?
(a) 8
(b) 2
(c) 1
(d) 4
(e) 9
Answer: (d)
Explanation:
Given Number: 5865871475
After Interchanging: 8657584157
Fourth from the right end is 4. So, option (d) is correct. - If 1 is subtracted from each even digit and 2 is subtracted from each odd digit in the number 768943, how many digits will appear twice in the new number thus formed?
(a) Only 3 and 1
(b) Only 5 and 7
(c) Only 1
(d) Only 1 and 7
(e) None of the above
Answer: (b)
Explanation:
Given Number: 768943
After Subtraction: 657831
Digits appearing twice: 5, 7. So, option (b) is correct. - If 1 is subtracted from each odd digit and 2 is subtracted from each even digit in the number 7897697, how many digits will appear twice in the new number thus formed?
(a) Only 6
(b) Only 6 and 8
(c) Only 8
(d) Only 4 and 8
(e) None of the above
Answer: (c)
Explanation:
Given Number: 7897697
After Subtraction: 6786475
Only 8 appears twice. So, option (c) is correct. - How many such numerals are there in the number ‘4685397497’ which will remain at the same position when arranged in ascending order from left to right?
(a) More than Four
(b) Four
(c) Two
(d) Three
(e) One
Answer: (d)
Explanation:
Given Number: 4685397497
Ascending Order: 3456784997
Three numerals will remain at the same position. Therefore, option (d) is correct. - In the number ‘6845782’, if all the even digits are subtracted by 2 and the odd digits are added by 1 then arrange the resultant digits in descending order from left to right. Find the sum of the second digit from the right and the third digit from the left end in the rearrangement?
(a) 3
(b) 0
(c) 5
(d) 8
(e) 9
Answer: (d)
Explanation:
Given Number: 6845782
After Operation: 4626860
Descending Order: 8666420
Sum = 6 + 2 = 8. So, option (d) is correct. - In the number ‘4867954213’, if all the even digits are added by 1 and all the odd digits are subtracted by 1, then arrange the resultant digits in ascending order from left to right. Find the difference between the 2nd and 5th digit from the left end from the new arrangement?
(a) 10
(b) 6
(c) 8
(d) 3
(e) 4
Answer: (d)
Explanation:
Given Number: 4867954213
After Operation: 5978063124
Ascending Order: 0123456789
Difference = 5 – 2 = 3. So, option (d) is correct. - Look at this series: 2, 1, (1/2), (1/4), … What number should come next?
A. (1/3)
B. (1/8)
C. (2/8)
D. (1/16)
Answer: B. (1/8)
Explanation:
This is a simple division series; each number is one-half of the previous number. In other terms, the number is divided by 2 successively to get the next result.
4/2=2
2/2=1
1/2=1/2
1/2/2=1/4
1/4/2=1/8
And so on. - Look at this series: 7, 10, 8, 11, 9, 12, … What number should come next?
A. 7
B. 10
C. 12
D. 13
Answer: C. 12
Explanation:
This is a simple alternating addition and subtraction series. In the first pattern, 3 is added; in the second, 2 is subtracted. - Look at this series: 36, 34, 30, 28, 24, … What number should come next?
A. 20
B. 22
C. 23
D. 26
Answer: B. 22
Explanation:
This is an alternating number subtraction series. First, 2 is subtracted, then 4, then 2, and so on. - Look at this series: 22, 21, 23, 22, 24, 23, … What number should come next?
A. 22
B. 24
C. 25
D. 26
Answer: B. 24
Explanation:
In this simple alternating subtraction and addition series; 1 is subtracted, then 2 is added, and so on. - Look at this series: 53, 53, 40, 40, 27, 27, … What number should come next?
A. 12
B. 14
C. 27
D. 53
Answer: A. 12
Explanation:
In this series, each number is repeated, then 13 is subtracted to arrive at the next number. - SCD, TEF, UGH, ____, WKL
Options:
A) CMN
B) UJI
C) VIJ
D) IJT
Answer: A) CMN
Explanation: The first series involves the first letters only, which are in alphabetical order: S, T, U, V, W. The second series involves the remaining letters, which follow the same pattern: CD, EF, GH, IJ, KL. - B2CD, _____, BCD4, B5CD, BC6D
Options:
A) B2C2D
B) BC3D
C) B2C3D
D) BCD7
Answer: C) B2C3D
Explanation: The letters remain the same, so focus on the number series, which follows a simple progression: 2, 3, 4, 5, 6. Each number corresponds to the position of the letter in the alphabet. - FAG, GAF, HAI, IAH, ____
Options:
A) JAK
B) HAL
C) HAK
D) JAI
Answer: C) HAK
Explanation: The middle letters are static, so focus on the first and third letters. The first letters follow alphabetical order: F, G, H, I, J. The second and fourth segments are reversals of the first and third segments. The missing segment starts with a new letter, hence “HAK.” - ELFA, GLHA, ILJA, _____, MLNA
Options:
A) OLPA
B) KLMA
C) LLMA
D) KLLA
Answer: C) LLMA
Explanation: The second and fourth letters, L and A, remain static. The first and third letters follow alphabetical order, starting with E. Hence, the missing segment should be “LLMA.” - CMM, EOO, GQQ, _____, KUU
Options:
A) GRR
B) GSS
C) ISS
D) ITT
Answer: A) GRR
Explanation: The first letters follow alphabetical order with a letter skipped in between each segment: C, E, G, I, K. The second and third letters also follow a pattern with a skipped letter: M, O, Q, S, U. Hence, the missing segment should be “GRR.” - Which word does NOT belong with the others?
- parsley
- basil
- dill
- mayonnaise
Answer: mayonnaise
Explanation: Parsley, basil, and dill are types of herbs used in cooking, while mayonnaise is a condiment made from oil, egg yolk, and vinegar.
- Which word does NOT belong with the others?
- inch
- ounce
- centimeter
- yard
Answer: ounce
Explanation: Inch, centimeter, and yard are units of length, while an ounce is a unit of weight.
- Which word does NOT belong with the others?
- tyre
- steering wheel
- engine
- car
Answer: car
Explanation: Tyre, steering wheel, and engine are all components or parts of a car, while “car” refers to the entire vehicle.
- Which word does NOT belong with the others?
- tulip
- rose
- bud
- daisy
Answer: bud
Explanation: Tulip, rose, and daisy are all types of flowers, whereas “bud” refers to the early stage of a flower before it blooms.
- Which word does NOT belong with the others?
- rye
- sourdough
- pumpernickel
- loaf
Answer: rye
Explanation:Loaf, sourdough, and pumpernickel are types of bread. A rye is not a bread type.Loaf – Bread that is shaped and baked in one piece and usually sliced before being eaten.
Pumpernickel – Dark, dense German bread made from coarsely ground whole-grain rye.
Sourdough – Leaven for making bread, consisting of fermenting dough, typically that left over from a previous batch.
Rye – A wheatlike cereal plant that tolerates poor soils and low temperatures.
- Direction (1-4): Study the following information carefully and answer the questions given below.
In a certain code language,
“World champion ahead time” is written as “kh ah bh hh”
“No time great expert” is written as “hh vh lh mh”
“Some great temple champion” is written as “lh nh bh zh”
“With no great day” is written as “lh vh xh yh”
“List ahead some expert” is written as “mh ch ah nh”
What is the code for the word “expert” in the given code language?
A. mh
B. vh
C. hh
D. lh
Answer: A. mh
Explanation: From the given information, we find that “expert” corresponds to “mh” in the code language. - What will be the code for the phrase “with group”, if the code for the phrase “day home” is “yh jh” in the given code language?
A. yh mh
B. yh lh
C. uh xh
D. xh vh
Answer: C. uh xh
Explanation: By observing the pattern in the provided codes, we can deduce that “with” corresponds to “uh” and “group” corresponds to “xh”. - What is the code for the phrase “world temple day” in the given code language?
A. kh hh zh
B. zh yh kh
C. kh xh zh
D. Either B or D
Answer: E. None of the above
Explanation: “World” corresponds to “kh”, “temple” corresponds to “lh”, and “day” corresponds to “yh”. Hence, the correct answer is “kh lh yh”, which is not provided as an option. - What is the code for the phrase “no list” in the given code language?
A. ch lh
B. vh hh
C. ch kh
D. vh ch
Answer: D. vh ch
Explanation: From the given information, “no” corresponds to “vh” and “list” corresponds to “ch”. Therefore, the code for the phrase “no list” is “vh ch”.
