ECAT Mathematics Chapter 23 With Answers

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ECAT Mathematics Chapter 23

Sr. # Questions Answers Choice
1 A conditional is regarded as false only when the antecedent is true and consequent is True False Known Unknown
2 A disjunction of two statement p and q is true p is false q is false Both p and q are false One of p and q is true
3 A conjunction of two statement p and q is true only if p is true q is true Both p and q are true both p and q are false
4 (A∩Bc)c= ------------------------- Ac∪Bc Ac∪B Ac∩B None of these
5 For a set A, A∪Ac= --------------------- A ∅ Ac U
6 A∪(A∪B)= -------------------- B A A∪B None of these
7 (A∪B)∪C= -------------------------- A∩B(B∪C) A∪(B∪C) A∪(B∩C) None of these
8 If B⊆ A, then complement of B in A is = ----------------------- A-B A∩B B-A A∪B
9 If A=B, then A⊂B and B⊂A A⊆B and B⊈A A⊆B and B⊆A None of these
10 The set X is Proper Subset of X Not A subset of X Improper Subset of X None of these
11 The function whose range consists of just one element is called One-One Function Identity Function Onto Function Constant Function
12 None of these
13 The set of natural is a semi group w.r.t Addition Division Subtraction None of these
14 A monoid (G, *) is said to be group if have identity element is commutative have inverse of each element None of these
15 The geometrical representation of a linear function is Circle Parabola Straight lie None of these
16 Addition Subtraction Multiplication None of these
17 None of these
18 If f:A→B is an injective function and second elements of no two of its ordered pairs are equal, then f is called 1-1 and onto Bijective 1-1 and into None of these
19 Onto function is also called Binjective function Injective function Surjechive function None of these
20 The contra positive of p → q is q → p ~q→~q ~p→~q None of these
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