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Practice Questions: Blood Relations | CSAT Preparation - UPSC PDF Download

Easy Level

These questions are targeted to improve your knowledge of basic concepts, though easy questions are rare in CAT. These are extremely important for conceptual understanding at the foundation level.

Example 1: Pointing to a lady on the stage, Devika said, “She is the sister of the son of the wife of my husband”. How is the lady related to Devika?
(a) Sister-in-law
(b) Sister
(c) Daughter
(d) Cousin
Ans: (c)
Solution: From Devika’s perspective, the wife of my husband means me. Then, my son’s sister means my daughter. Hence, option (c) is correct.

Example 2: Pointing to a lady, a man said, “Her husband is the only son of my mother”. How is the lady related to the man? 
(a) Wife
(b) Daughter
(c) Father-in-law
(d) None of these
Ans: (a)
Solution: Only son of my mother, means me. Hence, the situation transforms into I am her husband. Hence, the lady is the man’s wife. So, the correct option is (a).

Example 3: Pointing to a man, Manisha said, “He is the youngest son of my father-in-law’s only son”. How is Manisha related to this youngest son’s father?
(a) Daughter
(b) Sister
(c) Wife
(d) Can’t be determined
Ans: (c)
Solution: 

  • Looking at it from Manisha’s perspective, “my father-in-law’s only son” would be my husband.
  • Thus the youngest son of this person would also be Manisha’s son. 
  • Hence, this person’s father would be Manisha’s husband, and Manisha would be the wife. Option (c) is the answer.

Question for Practice Questions: Blood Relations
Try yourself:Arvind said, “This girl is the sister of the grandson of my mother”. How is this girl related to Arvind?
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Question for Practice Questions: Blood Relations
Try yourself:Arun told Meesum, “Yesterday I met the son of my wife’s father-in-law”. How is Arun related to that man?
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Question for Practice Questions: Blood Relations
Try yourself:A family consists of a husband and wife, their three sons and two daughters, three wives of three sons. How many females are in this family?
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Question for Practice Questions: Blood Relations
Try yourself:Arvind said, “This girl is the sister of the grandson of my mother”. How is this girl related to Arvind?
View Solution

Question for Practice Questions: Blood Relations
Try yourself:If a + b means a is sister of b, a – b means a is brother of b, a ¥ b means a is daughter of b, a ∏ b means a is mother of b. 

Q. Which of the following relationship shows that l and n are wife and husband?

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Question for Practice Questions: Blood Relations
Try yourself:Direction: If a + b means a is sister of b, a – b means a is brother of b, a ¥ b means a is daughter of b, a ∏ b means a is mother of b.

How many females does this relationship shows?
l + m – n + o – p ¥ q 

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Question for Practice Questions: Blood Relations
Try yourself:Instruction: If a + b means a is sister of b, a – b means a is brother of b, a ¥ b means a is daughter of b, a ∏ b means a is mother of b.

Q. The relationship p + q – r ¥ s ∏ t shows that

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Medium Level

Almost 70% of questions in CAT are Medium based questions. Though conceptually they seem easier, the trick is to solve the calculations faster & we curated problems for you to help you do problems easier.

Direction: If a + b means a is the daughter of b, a – b means a is the husband of b, a ¥ b means a is the brother of b.
Example 1: What does the relation p ¥ q – r show? 
(a) p is the son-in-law of r
(b) p is the brother of r
(c) r is the wife of p
(d) None of these
Ans: (d)
Solution: p ¥ q – r can be read as p is the brother of q and q is the husband of r. Thus p must be the brother-in-law of r. Hence, option (d) is correct.

Direction: If a + b means a is the daughter of b, a – b means a is the husband of b, a ¥ b means a is the brother of b.
Example 2: Which of the following statements does not hold?
(a) a + b × c
(b) a – b ¥ c
(c) a + b + c
(d) a + b – c
Ans: (b)
Solution: Option (b) says a – b ¥ c, this does not hold since a must be the husband of b (who is a female) and b is the brother of c (which cannot happen). Hence, option (b) is the answer.


Direction: If a + b means a is the daughter of b, a – b means a is the husband of b, a ¥ b means a is the brother of b.
Example 3: From the statement a ¥ b ¥ c ¥ d, which of the following statement is not necessarily true? 
(a) b is the brother of a
(b) c is the brother of a
(c) d is the brother of c
(d) a, b, c are male
Ans: (c)
Solution: 

  • a × b ¥ c ¥ d means a is the brother of b, b is the brother of c and c is the brother of d. This makes options (a), (b) and (d) as correct.
  • Only option (c) is not necessarily true since d could be b’s sister too.
    Hence, (c) is the answer.


Direction: If a + b means a is the daughter of b, a – b means a is the husband of b, a ¥ b means a is the brother of b.
Example 4: From the statement p – q + r ¥ s, how is q related to s? 
(a) Niece
(b) Sister
(c) Mother
(d) None of these
Ans: (a)
Solution: p – q + r ¥ s reads as p is the husband of q, q is the daughter of r and r is the brother of s. Thus, q must be s’s niece. Hence, option (a) is the correct answer. 


Example 5: Anwar’s father is the only son of Mahesh’s father. How is Mahesh related to Anwar?
(a) Father
(b) Brother
(c) Can’t be determined
(d) None of these
Ans: (a)
Solution: Anwar’s father being the only son of Mahesh’s father, means that Mahesh must be Anwar’s father. Option (a) is the answer. 


Example 6: If 
I. A is the brother of B 
II. B is the brother of C 
III. C is the brother of D 
IV. D is the sister of E. 
Then which of the following statements is not necessarily true?
(a) D is the sister of C
(b) B and C are brothers
(c) A, B, C are male, and D is a female
(d) D and E are sisters
Ans: (d)
Solution: A, B, C are siblings and brothers of each other. D is their sister, but we cannot say anything about E’s sex (whether E is male or female and hence brother or sister is unknown).
Hence, (d) is correct.


Example 7: Pointing to a photograph, Vandana says, “She is the elder daughter of my mother’s husband”. How is a person in the photograph related to Vandana?
(a) Sister
(b) Mother
(c) Sister-in-law
(d) None of these
Ans: (a)
Solution: Sister. Hence, option (a) is the answer. 

Question for Practice Questions: Blood Relations
Try yourself:Rahul has two mothers. Shalini is the step-daughter of Seema and step-sister of Rahul. How is Seema related to Rahul?
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Question for Practice Questions: Blood Relations
Try yourself:Instruction: If a + b means a is daughter of b, a – b means a is husband of b, a ¥ b means a is brother of b. 

Q. If h + i ¥ j + k × l + m ¥ n, then what is the present generation of h. Assume that the oldest generation in this group is the first generation?

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Question for Practice Questions: Blood Relations
Try yourself:Pointing to the man in the platform, Siddhartha said, “He is the brother of the father of my mother’s son”. How is this man on the platform related to Siddhartha?
View Solution

Hard Level

Around 25% of these type of questions come in CAT - If your target is above 95%ile, we recommend you solve these questions.

Direction: a * b means a is the brother of b. a @ b means a is the daughter of b. a $ b means a is the sister of b.
Example 1: Which of the following shows the relationship p is the paternal uncle of n?
(a) n$o@p
(b) n@o$p
(c) n@o*p
(d) None of these
Ans: (c)
Solution: n@o*p reads, n is the daughter of o and o is the brother of p. Hence, p becomes n’s, paternal uncle. So, option (c) is correct.

Direction: a * b means a is the brother of b. a @ b means a is the daughter of b. a $ b means a is the sister of b.
Example 2: If a $b$c@d@e*f*g, then how many males and females are there respectively? 
(a) 4, 3
(b) 3, 4
(c) 5, 2
(d) Can’t be determined
Ans: (d)
Solution: Again here, g’s sex is indeterminable. Hence, the answer cannot be determined. Option (d) is the answer.

Direction: P, Q, R, S, T went on a picnic. P is the son of Q, but Q is not the father of P. R is the son of S, who is the brother of P. T is the wife of S.
Example 3: How many males are present in this group?
(a) 1
(b) 2
(c) 3
(d) 4
Ans: (c)
Solution: P is the son of Q but Q is not the father of P means that Q must be the mother of P. Also, R is the son of S, who is the brother of P means that S and P must be brothers and R is S’s son. Also, since T is the wife of S, R must be T’s son also. Consolidating these relationships we get: Q mother of S and P (brothers). Also, S’s wife is T and their son is R. P is S’s Brother. Hence, (c) is correct option.

Question for Practice Questions: Blood Relations
Try yourself:Direction: a * b means a is the brother of b. a @ b means a is the daughter of b. a $ b means a is the sister of b.

Q. From the following statement, what is the relationship between n and s? n$o@p*q$r*s

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Question for Practice Questions: Blood Relations
Try yourself:Direction: P, Q, R, S, T went on a picnic. P is the son of Q but Q is not the father of P. R is the son of S, who is the brother of P. T is the wife of S.

Q. How is P related to S?

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The document Practice Questions: Blood Relations | CSAT Preparation - UPSC is a part of the UPSC Course CSAT Preparation.
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FAQs on Practice Questions: Blood Relations - CSAT Preparation - UPSC

1. What is blood relation in the context of aptitude exams?
Ans. In aptitude exams, blood relation refers to the relationships between family members, such as parents, siblings, grandparents, and so on. It involves understanding the kinship and genealogical connections within a family and solving problems based on these relationships.
2. How can I solve blood relation questions easily?
Ans. To solve blood relation questions easily, it is important to first understand the given information about the family members. Then, make a family tree or diagram to visualize the relationships. Use the given clues to deduce further connections and make logical deductions. Practice solving different types of blood relation problems to improve your skills.
3. What are some common types of blood relation questions in exams?
Ans. Some common types of blood relation questions in exams include finding the relationship between two given individuals, determining the gender of a family member based on the given information, identifying the generation of a person, solving puzzles involving family relationships, and so on. These questions test your ability to analyze and infer relationships based on the given clues.
4. How can I approach complex blood relation questions?
Ans. Complex blood relation questions require careful analysis and logical reasoning. Start by organizing the given information in a systematic manner, such as making a family tree. Look for any direct or indirect relationships that can be deduced from the clues. Break down the problem into smaller parts and solve them step by step. Practice solving complex blood relation problems to improve your problem-solving skills.
5. Are there any tips or tricks to solve blood relation questions quickly?
Ans. Yes, there are some tips and tricks to solve blood relation questions quickly. One such tip is to assign symbols or codes to represent family members, making it easier to understand and solve the problem. Another trick is to look for keywords or key information in the given clues that can help you make logical deductions. Additionally, practicing regularly and familiarizing yourself with different types of blood relation problems can help improve your speed and accuracy.
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