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Arithmetic Aptitude :: Sets, Relations and Functions

  1.  A subset H of a group(G,*) is a group if

  2. A.

    a,b ∈ H  ⇒ a * b ∈ H

    B.

    a ∈ H⇒ a-1 ∈ H

    C.

    a,b ∈ H  ⇒ a * b-1 ∈ H

    D.

    H contains the identity element

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  3.  If A = {1, 2, 3} then relation S = {(1, 1), (2, 2)} is

  4. A.

    symmetric only

    B.

    anti-symmetric only

    C.

    an equivalence relation

    D.

    both symmetric and anti-symmetric

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  5.  Which of the following statements is true?

  6. A.

    Empty relation  φ is reflexive

    B.

    Every equivalence relation is a partial-ordering relation.

    C.

    Number of relations form A = {x, y, z} to B= {1, 2} is 64.

    D.

    Properties of a relation being symmetric and being ant-symmetric are negative of each other.

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  7.  Let A = {1, 2, .....3 } Define ~ by x ~ y ⇔ x divides y. Then ~ is

  8. A.

    symmetric

    B.

    an equivalence relation

    C.

    a partial-ordering relation

    D.

    relexive, but not a partial-ordering

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  9.  G(e, a, b, c} is an abelian group with 'e' as identity element. The order of the other elements are

  10. A.

    2,2,4

    B.

    2,2,3

    C.

    2,3,4

    D.

    3,3,3

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  11.  If f : A ---> B is a bijective function, then f -1 of f =

  12. A.

    f

    B.

    f -1

    C.

    f o f -1

    D.

    IA(Identity map of the set A)

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  13.  The set of all real numbers under the usual multiplication operation is not a group since

  14. A.

    zero has no inverse

    B.

    identity element does not exist

    C.

    multiplication is not associative

    D.

    multiplication is not a binary operation

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  15.  If (G, .) is a group such that (ab)- 1 = b-1 a-1, ∀ a, b ∈ G, then G is a/an

  16. A.

    abelian group

    B.

    non-abelian group

    C.

    commutative semi group

    D.

    None of these

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  17.  If * is defined on R* as a * b = (ab/2) then identity element in the group (R*, *) is

  18. A.

    1

    B.

    2

    C.

    1/2

    D.

    1/3

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  19.  If (G, .) is a group such that a2 = e, ∀ a ∈ G, then G is

  20. A.

    semi group

    B.

    abelian group

    C.

    non-abelian group

    D.

    none of these

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