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Subjects

Mathematics

Reflexive relation

In Class 12 Mathematics, under Relations and Functions, students study a reflexive relation as a relation R on a set A in which every element is related to itself: (a, a) ∈ R for every a ∈ A. They learn to verify this condition from ordered pairs, tables, matrices, and arrow diagrams, and to identify examples and non-examples. The topic also helps students distinguish reflexivity from other relation properties such as symmetry and transitivity.

Medium · Level 4 · 25 questions

TOPIC PRACTICE

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25 questions

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  1. (R) is reflexive
  2. (R) is not reflexive
  3. (R) does not contain ((1,1))
  4. (R) is only the identity relation
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  1. In a self-pair, (|a-a|=0)
  2. In a self-pair, (|a-a|>0)
  3. Every pair satisfies the condition
  4. (A) has no element
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  1. Reflexive
  2. Not reflexive
  3. Reflexive only for (2)
  4. Reflexive only for odd numbers
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  1. For every (a), (a-a=0), which is divisible by (3)
  2. Every (a) is divisible by (3)
  3. Every two elements are equal
  4. (A) has only three elements
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  1. Both are reflexive
  2. Only (R) is reflexive
  3. Only (S) is reflexive
  4. Neither is reflexive
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  1. It is always true
  2. It is always false
  3. It is true only for empty (A)
  4. It is true only for universal (R)
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  1. (S) will be reflexive
  2. (S) will not be reflexive
  3. (S) will be empty
  4. (S) will have no self-pair
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  1. Reflexive
  2. Not reflexive
  3. Universal
  4. Identity relation
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  1. Yes, because (a-a=0) and (0) is divisible by (4)
  2. No, because (1-2) is not divisible by (4)
  3. No, because all elements are not divisible by (4)
  4. Yes, because (A) has (4) elements
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  1. (R) is reflexive
  2. (R) is not reflexive
  3. (R) has no self-pair
  4. (R=A\times A)
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  1. It is reflexive
  2. It is not reflexive
  3. It is empty
  4. It contains only unequal pairs
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  1. Because (a^2-a^2=0) for every (a)
  2. Because (a^2=0) for every (a)
  3. Because (a^2=b^2) for every (a\ne b)
  4. Because (A) has only one element
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  1. (R) is reflexive
  2. (R) is not reflexive
  3. (R) does not contain ((1,1))
  4. (R) does not contain ((2,2))
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  1. Not reflexive
  2. Reflexive
  3. Reflexive only because of ((3,3))
  4. Universal
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  1. (R^c) is not reflexive
  2. (R^c) is reflexive
  3. (R^c=R)
  4. (R^c) has all self-pairs
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  1. (R^c) is not reflexive
  2. (R^c) is reflexive
  3. (R^c=A\times A)
  4. (R^c) contains all ((a,a))
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  1. ((2,2))
  2. ((1,2))
  3. ((2,3))
  4. Both ((1,2)) and ((2,3))
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  1. Not reflexive
  2. Reflexive
  3. Reflexive only for even elements
  4. Universal
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  1. (3)
  2. (2)
  3. (1)
  4. (0)
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  1. Reflexive
  2. Not reflexive
  3. Empty
  4. Only universal
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  1. Not reflexive
  2. Reflexive
  3. Universal
  4. Identity relation
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  1. Yes
  2. No
  3. Only for (1)
  4. Not only for (4)
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  1. (R) is not reflexive
  2. (R) is reflexive
  3. (R) has all ((a,a))
  4. (R=A\times A)
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  1. Reflexive
  2. Not reflexive
  3. Not for (1) only
  4. Empty relation
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  1. For ((0,0)), (0\cdot 0>0) is not true
  2. For ((-1,-1)), the product is positive
  3. For ((1,1)), the product is positive
  4. All self-pairs satisfy the condition

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