Math 9th Chap 3 : Topic 4 - Maryam Publications

Math Chapter 3 : Topic 4

Set Laws

1 / 20

In a shopping mall, customers are grouped into "Electronics buyers" and "Clothing buyers." A person who buys both belongs to:

A) Universal set only

B) Disjoint set

C) Intersection set

D) Empty set

2 / 20

Which set represents people who belong to either Group $A$ or Group $B$ or both?

A) $A \cup B$

B) $B - A$

C) $A \cap B$

D) $A - B$

3 / 20

In demographic classification, people aged $18 - 25$ and students form sets. Students aged $18 - 25$ belong to:

A) Complement

B) Intersection

C) Union

D) Difference

4 / 20

Which best describes real-life use of sets?

A) Artistic drawing

B) Logical classification

C) Random grouping

D) Emotional grouping

5 / 20

If $A = \ $electronics buyers and $B = \ $clothing buyers,$\ A - B\ $represents:

A) Only electronics buyers

B) No buyers

C) Buyers of both items

D) Only clothing buyers

6 / 20

In a music library, all songs belong to:

A) Disjoint set

B) Empty set

C) Universal set

D) Intersection set

7 / 20

Which situation best represents a disjoint set?

A) Boys and girls in same class

B) Students and teachers

C) Even numbers and odd numbers

D) Reducing customers

8 / 20

A customer buys only food items in a mall. He belongs to:

A) Food $\cap$ Clothing

B) Food only set

C) Food $\cap$ Clothing

D) Complement of Food

9 / 20

In set theory, categorizing products in a mall helps mainly in:

A) Removing products

B) Reducing customers

C) Increasing prices

D) Organizing data logically

10 / 20

If $A$ and $B$ are overlapping sets, then:

A) $A \subseteq B$ always

B) $A \cap B = \varnothing$

C) $A = B$ always

D) $A \cap B \neq \varnothing$

11 / 20

Which operation is used to find customers who buy both shoes and bags?

A) Intersection

B) Difference

C) Union

D) Complement

12 / 20

Set theory is mainly useful in real life for:

A) Organizing and classifying data

B) Decorating charts

C) Removing categories

D) Increasing confusion

13 / 20

Which of the following is NOT a real-life application of sets?

A) Classifying students

B) Writing stories randomly

C) Sorting shopping products

D) Organizing music genres

14 / 20

In a demographic survey, males and females are:

A) Subsets

B) Equal sets

C) Overlapping sets

D) Disjoint sets

15 / 20

If $A =$ students who like football, $B =$ students who like cricket, $A \cap B$ represents:

A) Students who like both sports

B) Students who like none

C) Students who like only football

D) Students who like only cricket

16 / 20

Which represents customers who do NOT buy electronics?

A) Electronics set

B) Electronics $\cap$ Clothing

C) Electronics $\cup$ Clothing

D) Complement of electronics set

17 / 20

Which is a correct real-life interpretation of $A - B$?

A) People in $A$ but not in $B$

B) People in $B$ but not in $A$

C) People in neither $A$ nor $B$

D) People in both $A$ and $B$

18 / 20

If $A$ and $B$ are disjoint, then $A \cap B$ is:

A) $\varnothing$

B) $B$

C) $U$

D) $A$

19 / 20

Which set operation is used for "either / or" condition in real life?

A) Union

B) Difference

C) Intersection

D) Complement

20 / 20

In a shopping mall, electronics $\cap$ clothing represents:

A) Only clothing buyers

B) Only electronics buyers

C) All shoppers

D) Shoppers who buy both categories

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