The set of vowels in the English alphabet is, a) {a, e, i, o, u}, b) {a, b, c, d, e}, c) {1, 2, 3, 4, 5}, d) {a}, Which symbol is used to denote "belongs to"?, a) ⊂, b) ∈, c) ∪, d) #, If A = {1, 2, 3, 4}, then 3 _ A., a) ∈, b) ∉, c) ⊂, d) ∪, The empty set is represented by:, a) {0}, b) {} or ∅, c) { } with elements, Which of the following is a finite set?, a) Natural numbers, b) Integers, c) Days of the week, The set P = {x | x ∈ Z , –1< x < 1} is a, (1) Singleton set, (2) Power set, (3) Null set, (4) Subset, If U ={x | x ∈ N , x < 10} and A = {x | x ∈ N , 2 ≤ x < 6} then (A′)′ is, (1) {1, 6, 7, 8, 9}, (2) {1, 2, 3, 4}, (3) {2, 3, 4, 5}, (4) { }, If B⊆ A then n(A∩B) is, (1) n(A–B), (2) n(B), (3) n(B – A), (4) n(A), If A = {x, y, z} then the number of non- empty subsets of A is, (1) 8, (2) 5, (3) 6, (4) 7, Which of the following is correct?, (1) ∅ ⊆ {a, b}, (2) ∅ ∈ {a, b}, (3) {a} ∈ {a, b}, (4) a ⊆ {a, b}

class 9 Set language objectives

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