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Mathematics

Types of relations

Types of Relations is a Class 12 Mathematics topic in the chapter Relations and Functions. Students learn how a relation is defined between elements of sets and how to identify important types, including empty, universal, identity, reflexive, symmetric, transitive, and equivalence relations. The topic develops skills in representing relations, checking their properties using ordered pairs or set-based reasoning, and distinguishing relations by their structure. It also prepares learners to connect relation properties with functions and solve related exercises accurately.

Easy · Level 4 · 25 questions

Practice questions

01If (A) has (3) elements, how many pairs are in the universal relation?

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02If (A) has (5) elements, how many pairs are in the identity relation?

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03If (A) has (5) elements, how many pairs are in the universal relation?

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04Which relation is reflexive and symmetric on every set?

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05Which relation is reflexive, symmetric and transitive on every set?

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06Why is the universal relation always symmetric?

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07Why is the universal relation always reflexive?

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08Why is the universal relation always transitive?

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09Why is the empty relation not an equivalence relation on a non-empty set?

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10Which properties does the empty relation have on a non-empty set?

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11If a relation is symmetric, must it also be reflexive?

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12If a relation is reflexive, must it also be symmetric?

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13If a relation is reflexive and symmetric, is it always an equivalence relation?

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14If a relation is reflexive and transitive, is it always an equivalence relation?

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15If a relation is reflexive and antisymmetric, is it always a partial order relation?

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16If a relation is reflexive, antisymmetric and transitive, what is it called?

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17If (R=A\times A), what is (R) called?

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18If (R={(a,a):a\in A}), what is (R) called?

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19If (R=\varnothing), what is (R) called?

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20On (A={1,2,3}), what type of relation is (R={(1,1),(2,2),(3,3),(1,2),(2,1),(1,3),(3,1),(2,3),(3,2)})?

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21On (A={1,2,3,4}), what type of relation is (R={(1,1),(2,2),(3,3),(4,4)})?

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22On (A={1,2,3}), which property is definitely satisfied by (R={(1,2),(2,1),(2,3),(3,2),(1,3),(3,1)})?

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23On (A={1,2,3}), which property is clearly visible in (R={(1,2),(2,3),(1,3),(2,2)})?

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24On (A={1,2,3}), what type of relation is (R={(1,1),(2,2),(3,3)})?

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25How many pairs are there in the empty relation on (A={1,2})?

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