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Arithmetic Aptitude :: Algebra Problems

  1.  Let A be the set of all non-singular matrices over real numbers and let * be the matrix multiplication operator. Then

  2. A.

    < A, * > is a monoid but not a group

    B.

    < A, * > is a group but not an abelian group

    C.

    < A, * > is a semi group but not a monoid

    D.

    A is closed under * but < A, * > is not a semi group


  3.  Let (Z, *) be an algebraic structure, where Z is the set of integers and the operation * is defined by n * m = maximum (n, m). Which of the following statements is TRUE for (Z, *) ?

  4. A.

    (Z, *) is a group

    B.

    (Z, *) is a monoid

    C.

    (Z, *) is an abelian group

    D.

    None of these


  5.  Some group (G, 0) is known to be abelian. Then which one of the following is TRUE for G ?

  6. A.

    G is of finite order

    B.

    g = g² for every g ∈ G

    C.

    g = g-1 for every g ∈ G

    D.

    (g o h)² = g²o h² for every g,h ∈ G


  7.  If the binary operation * is deined on a set of ordered pairs of real numbers as (a,b)*(c,d)=(ad+bc,bd) and is associative, then (1, 2)*(3, 5)*(3, 4) equals

  8. A.

    (7,11)

    B.

    (23,11)

    C.

    (32,40)

    D.

    (74,40)


  9.  If A = (1, 2, 3, 4). Let ~= {(1, 2), (1, 3), (4, 2)}. Then ~ is

  10. A.

    reflexive

    B.

    transitive

    C.

    symmetric

    D.

    not anti-symmetric


  11.  If a, b are positive integers, define a * b = a where ab = a (modulo 7), with this * operation, then inverse of 3 in group G (1, 2, 3, 4, 5, 6) is

  12. A.

    1

    B.

    3

    C.

    5

    D.

    7


  13.  Which of the following is TRUE ?

  14. A.

    Set of all matrices forms a group under multipication

    B.

    Set of all non-singular matrices forms a group under multiplication

    C.

    Set of all rational negative numbers forms a group under multiplication

    D.

    None of these


  15.  The set of all nth roots of unity under multiplication of complex numbers form a/an

  16. A.

    group

    B.

    abelian group

    C.

    semi group with identity

    D.

    commutative semigroups with identity


  17.  Which of the following statements is FALSE ?

  18. A.

    The set of rational numbers form an abelian group under multiplication

    B.

    The set of rational numbers is an abelian group under addition

    C.

    The set of rational integers is an abelian group under addition

    D.

    None of these


  19.  In the group G = {2, 4, 6, 8) under multiplication modulo 10, the identity element is

  20. A.

    2

    B.

    4

    C.

    6

    D.

    8