2nd PUC Mathematics Series 2 December 3, 2020December 22, 2020wefru PUC Science 2nd Year Mathematics Series-2 quiz 0 Created on December 02, 2020 By wefru 2nd PUC Mathematics Series 2 TEST YOUR KNOWLEDGE OF SCIENCE 1 / 10 11. If f(x) = 3x+2/5x−3 then (fof)(x) is x x6 – x3 10 0 2 / 10 12. The number of binary operations that can be defined on a set of 2 elements is 16 20 15 0 3 / 10 13. Let * be a binary operation on Q, defined by a * b = 3ab/5 is Commutative Associative Both (a) and (b) None of these 4 / 10 14. Let * be a binary operation on set Q of rational numbers defined as a * b = ab/5. Write the identity for *. 5 1 2 3 5 / 10 15. For binary operation * defind on R – {1} such that a * b = a/b+1 is not associative not commutative commutative both (a) and (b) 6 / 10 16. he binary operation * defind on set R, given by a * b = a+b/2 for all a,b ∈ R is commutative associative Both (a) and (b) None of these 7 / 10 17. Let A = N × N and * be the binary operation on A defined by (a, b) * (c, d) = (a + c, b + d). Then * is commutative associative Both (a) and (b) None of these 8 / 10 18. Find the identity element in the set I+ of all positive integers defined by a * b = a + b for all a, b ∈ I+. 0 1 2 3 9 / 10 19. Let * be a binary operation on set Q – {1} defind by a * b = a + b – ab : a, b ∈ Q – {1}. Then * is Commutative Associative Both (a) and (b) None of these 10 / 10 20. The binary operation * defined on N by a * b = a + b + ab for all a, b ∈ N is commutative only associative only both commutative and associative none of these Your score is The average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz