Question

1. The setP = {x|x EZ,-l<r < 1} is a
(A) Singleton set (B) Power set (C) Null set (D) Subset
2. If U={x |x €N,x < 10} and A = {x|x €N,2<x<6} then (A) is
(A) {1,6,7, 8,9} (B) {1,2,3, 4} (C) {2,3,4, 5}
D)
3. IfA = {x, y, z} then the number of non- empty subsets of A is
(A) 8
(B) 5
(C)6 (D) 7
4. If AUB = AnB, then
(D) BC A
(A) A#B
5. If B-A is B, then AnB is
(A) A
(B) A = B
C)AC B
(B) B (C)U
(D) {}
6. If n is a natural number then Vn is
(A) always a natural number.
C) always a rational number (D) may be rational or irrational
7. Which of the following is not true?.
(B) always an irrational number.
(A)Every rational number is a real number.
(B) Every integer is a rational number.
C) Every real number is an irrational number.
(D) Every natural number is a whole number.
8. Which one of the following has a terminating decimal expansion?.
(A) 5/64
9. Which one of the following is an irational number
(A) V25 (B) V9/4)
(B) 8/9 (C) 14/15
(D) 1/12
C) 7/11 D) T
10.An irrational number between 2 and 2.5 is
(B) V5
D) V8
(A) VI1
C) 2.5
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Answer 1

Answer:

7. B. always an irrational number.