#### Set Language English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021

9th Standard

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Maths

Time : 00:10:00 Hrs
Total Marks : 10

Part A

10 x 1 = 10
1. Number of subsets in set A = {1,2,3} is ________

(a)

3

(b)

6

(c)

8

(d)

9

2. Sets having the same number of elements are called ___________

(a)

overlapping sets

(b)

disjoints sets

(c)

equivalent sets

(d)

equal sets

3. The set of (A U B) - (A ก B) is ____________

(a)

(AUB)'

(b)

AΔB

(c)

(A∩B)'

(d)

A'UB'

4. The number of elements of the set {x : x ∈ Z, x2 = I} is ________

(a)

0

(b)

1

(c)

2

(d)

3

(a)

A - B

(b)

B - A

(c)

A'

(d)

B'

6. Which of the following is true?

(a)

$\left( A\cup B \right) =B\cup A$

(b)

${ \left( A\cup B \right) }^{ ' }{ A }^{ ' }{ -B }^{ ' }$

(c)

${ \left( A\cap B \right) }^{ ' }={ A }^{ ' }\cap { B }^{ ' }$

(d)

$A-\left( B\cap C \right) =\left( A-B \right) \cap \left( A-C \right)$

7. If A,B,C are non-overlapping sets,then n $\left( A\cap B\cap C \right)$ is ___________

(a)

n(A) + n(B) + n(C)

(b)

$n\left( A\cup B\cup C \right)$

(c)

0

(d)

$n\left( A\cap B \right)$

8. In a town 30% like only coffee,20% like only tea,10% like only like,15% like only any two of them,5% only like all the three. What is the percentage of people who like none them.

(a)

15%

(b)

20%

(c)

10%

(d)

5%

9. $\left( A\cup B\cup C \right) \cup \left( A\cup BC \right) ^{ ' }$=_______

(a)

$\Phi$

(b)

A

(c)

U

(d)

$A\cap B\cap C$

10. For any three sets,P,Q,R$\left( P\cap Q \right) ^{ ' }$

(a)

${ P }^{ ' }\cup { Q }^{ ' }$

(b)

$P\cup Q$

(c)

${ P }^{ ' }$

(d)

${ Q }^{ ' }$