Structure and Union MCQs

Question 1

What is the keyword used to define a structure in C?

Accepted Answer

struct

Answer

record

Answer

class

Answer

object

Question 2

In a structure, what are the members also known as?

Accepted Answer

Variables

Answer

Properties

Answer

Objects

Answer

Elements

Question 3

Which of the following can be a member of a structure?

Accepted Answer

Another structure

Answer

Function

Answer

Enumeration

Answer

All of the above

Question 4

How do you access a member of a structure in C?

Accepted Answer

. (dot)

Answer

-> (arrow)

Answer

:: (scope)

Answer

, (comma)

Question 5

Which keyword is used to declare a union in C?

Accepted Answer

union

Answer

struct

Answer

class

Answer

typedef

Question 6

What is the primary difference between a structure and a union in C?

Accepted Answer

Union allows only one active member

Answer

Structure allows nested members

Answer

Union allows nested members

Answer

Structure allows multiple members

Question 7

How is the size of a structure determined in C?

Accepted Answer

By the size of its largest member

Answer

By the total size of its members

Answer

By the size of its smallest member

Answer

By the number of members

Question 8

Which statement correctly defines a structure named "Person" with members "name" and "age" of type char* and int respectively?

Accepted Answer

struct Person { char* name; int age; }

Answer

struct Person { name, age; }

Answer

struct { name; age; } Person;

Answer

struct { char* name, int age; } Person;

Question 9

What does the 'sizeof' operator in C return for a union?

Accepted Answer

Size of the largest member

Answer

Total size of all union members

Answer

Size of the smallest member

Answer

Size of the union itself