ECAT Mathematics Chapter 23 With Answers

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ECAT Mathematics Chapter 23

Sr. # Questions Answers Choice
1 In a country, 55% of the male population has houses in cities while 30% have houses both in cities and in village. Find the percentage of the population that has house only in villages. 45 30 25 50
2 Decimal part of irrational number is Terminating Repeating only Neither repeating nor terminating Repeating and terminating
3 Multiplicative inverse of 0 is 0 1 +-1 Does not exist
4 The identity elements with respect to subtraction is 0 1 -1 Does not exist
5 -x Infinite set {-4, 4} None of these
6 1/x -x 2x 0.5 x
7 Additive inverse of -a -b is a -a + b a - b a + b
8 If a set S contains "n" elements then P (S) has ...... number of elements 2<sup>n</sup> 2<sup>2n</sup> 2 . n n<sup>2</sup>
9 Multiplicative inverse of "1" is +- 1 0 1 None of these
10 The set {-1, 1} is closed under the binary operation of Addition Multiplication Subtraction Division
11
12 The total number of subsets that can be formed out of the set {a, b, c} is 1 4 8 12
13 A = B B = C A = C None of these
14 1 12 5 29
15 Given X, Y are many two sets such that number of elements in X = 18, number of elements in set Y = 24, and number of elements in set X ∪ Y = 40, then number of elements in set X + Y = 3 1 2 4
16 In set builder notation the set {0, 1, 2, ............, 100} can be written as
17 A B A' None of these
18 For any set B, BUB' is Is set B Set B' Universal set None of these
19 The set (Z, +) forms a group Forms a group w.r.t. addition Non commutative group w.r.t. multiplication Forms a group w.r.t multiplication Doesn't form a group
20 The set (Q, .) Forms a group Does not form a group Contains no additive identity Contains no additive inverse
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