SSC CHSL Reasoning Questions
73 questions on General Intelligence and Reasoning for SSC CHSL. Each comes with the correct answer and a worked explanation.
- Questions
- 73
- Easy
- 28
- Moderate
- 45
Reasoning topics
Reasoning questions with solutions
In a certain code language, 'TABLE' is written as 'WDEOH'. How will 'GRAPE' be written in that language?
- (A)KVETI
- (B)ITCRG
- (C)JUDSH
- (D)DOXMB
Show answer and explanation
Correct answer: (C) JUDSH
Comparing 'TABLE' with 'WDEOH', every letter is moved 3 places forward in the English alphabet. Moving each letter of 'GRAPE' 3 places forward gives 'JUDSH'.
Three of the following four numbers are alike in a certain way and one is different. Select the odd one out.
- (A)36
- (B)63
- (C)121
- (D)64
Show answer and explanation
Correct answer: (B) 63
Each of 36, 64, 121 is a perfect square, whereas 63 is not a perfect square. Therefore 63 does not belong to the group and is the odd one out.
Select the letter that will come next in the following series. P, R, T, V, X, ?
- (A)Y
- (B)Z
- (C)W
- (D)X
Show answer and explanation
Correct answer: (B) Z
Each letter is 2 positions ahead of the previous one in the English alphabet (P → R → T …). Moving 2 positions ahead of X gives Z.
Anita walks 5 km towards the south, then turns and walks 12 km towards the east. How far is Anita from the starting point?
- (A)13 km
- (B)14 km
- (C)12 km
- (D)17 km
Show answer and explanation
Correct answer: (A) 13 km
The two legs of the walk are at right angles, so the shortest distance from the start is the hypotenuse: √(5² + 12²) = √(25 + 144) = √169 = 13 km.
Shortcut: 5-12-13 is a Pythagorean triple.
In a row of students, Riya is 18th from the left end and 12th from the right end. How many students are there in the row?
- (A)28
- (B)29
- (C)31
- (D)30
Show answer and explanation
Correct answer: (B) 29
Total students = (position from left) + (position from right) − 1, because Riya is counted twice. So the total = 18 + 12 − 1 = 29.
Shortcut: Total = left rank + right rank − 1.
If 'P' means '×', 'Q' means '+' and 'R' means '−', what is the value of the following expression? 5 P 8 Q 11 R 1
- (A)51
- (B)52
- (C)50
- (D)23
Show answer and explanation
Correct answer: (C) 50
Replacing the letters with the operations gives 5 × 8 + 11 − 1. Following BODMAS, multiply first: 40 + 11 − 1 = 50.
Pointing to a girl in a photograph, Suresh said, "She is the daughter of my grandfather's only son." How is the girl related to Suresh?
- (A)Cousin
- (B)Niece
- (C)Sister
- (D)Aunt
Show answer and explanation
Correct answer: (C) Sister
Suresh's grandfather's only son is Suresh's father. The daughter of Suresh's father is Suresh's sister, so the girl in the photograph is Suresh's sister.
Select the number that will come next in the following series. 5, 10, 20, 40, 80, ?
- (A)240
- (B)159
- (C)158
- (D)160
Show answer and explanation
Correct answer: (D) 160
Each term is obtained by multiplying the previous term by 2. Applying the same pattern to the last given term 80 gives 160, which is the next number in the series.
Select the option that is related to the third number in the same way as the second number is related to the first number. 5 : 125 :: 9 : ?
- (A)729
- (B)720
- (C)82
- (D)72
Show answer and explanation
Correct answer: (A) 729
In the first pair, 125 is the cube of the first number (5 → 125). Applying the same relation to 9 gives 729, so 729 completes the analogy.
In a certain code language, 'HOUSE' is written as 'IPVTF'. How will 'NORTH' be written in that language?
- (A)PQTVJ
- (B)NORTH
- (C)MNQSG
- (D)OPSUI
Show answer and explanation
Correct answer: (D) OPSUI
Comparing 'HOUSE' with 'IPVTF', every letter is moved 1 place forward in the English alphabet. Moving each letter of 'NORTH' 1 place forward gives 'OPSUI'.
Three of the following four numbers are alike in a certain way and one is different. Select the odd one out.
- (A)43
- (B)29
- (C)31
- (D)39
Show answer and explanation
Correct answer: (D) 39
Each of 43, 29, 31 is a prime number, whereas 39 is not a prime number. Therefore 39 does not belong to the group and is the odd one out.
Amit walks 15 km towards the east, then turns and walks 20 km towards the south. How far is Amit from the starting point?
- (A)25 km
- (B)35 km
- (C)27 km
- (D)26 km
Show answer and explanation
Correct answer: (A) 25 km
The two legs of the walk are at right angles, so the shortest distance from the start is the hypotenuse: √(15² + 20²) = √(225 + 400) = √625 = 25 km.
Shortcut: 15-20-25 is a Pythagorean triple.
In a row of students, Manoj is 5th from the left end and 18th from the right end. How many students are there in the row?
- (A)23
- (B)24
- (C)21
- (D)22
Show answer and explanation
Correct answer: (D) 22
Total students = (position from left) + (position from right) − 1, because Manoj is counted twice. So the total = 5 + 18 − 1 = 22.
Shortcut: Total = left rank + right rank − 1.
If 'P' means '×', 'Q' means '+' and 'R' means '−', what is the value of the following expression? 7 P 8 Q 23 R 1
- (A)216
- (B)78
- (C)79
- (D)80
Show answer and explanation
Correct answer: (B) 78
Replacing the letters with the operations gives 7 × 8 + 23 − 1. Following BODMAS, multiply first: 56 + 23 − 1 = 78.
Pointing to a girl in a photograph, Vikram said, "She is the daughter of my grandfather's only son." How is the girl related to Vikram?
- (A)Cousin
- (B)Aunt
- (C)Sister
- (D)Niece
Show answer and explanation
Correct answer: (C) Sister
Vikram's grandfather's only son is Vikram's father. The daughter of Vikram's father is Vikram's sister, so the girl in the photograph is Vikram's sister.
Showing 15 of 73 questions. Start a practice set above to work through the rest.
Frequently asked questions
How many SSC CHSL Reasoning questions can I practise here?
73 questions — 28 easy and 45 moderate. 15 are shown on this page with answers and explanations, and the practice set draws from all of them.
How should I practise Reasoning for SSC CHSL?
Read through a few solved questions first to see the method, then take a timed practice set. Afterwards, check which questions you got wrong or spent longest on and redo those before moving on.