OOP Extern Variable Quiz Online Practice Test

1. What is an extern variable?

Variables declared in a different object file

Variables declared in a different source file

Variables declared in a different executable file

Variables declared in a different program

2. Which of the following statements is correct regarding variable declarations?

A variable can be declared multiple times

A variable can be declared only once

Variable declaration cannot be done more than once

Variable declaration is always done multiple times

3. Which of the following is true about variables?

A variable can be defined only once

A variable can be defined any number of times

A variable must be defined more than once

A variable can be defined in different files

4. To use an extern variable ________________.

The source file must not be included in the new file code

The source file itself must be used in the new program

The source file must be included in the new file

The source file is irrelevant for extern variables

5. What does a header file contain for an extern variable?

Only the declaration of variables

Only the definition of variables

Both the declaration and definition of variables

Neither the declaration nor the definition

6. Which condition is true when using an extern variable in a file?

All header files must declare it

Only the necessary header files should declare it

All header files declare it if needed

Only one header file should declare it

7. Whenever a function is declared in a program _________.

`extern` can be used only in some special cases

`extern` cannot be used

The function is `extern` by default

It cannot be made `extern`

8. Which of the following actions actually allocates memory for extern variables?

Declaration

Definition

Including the file

Memory is not allocated for extern variables

9. What is the correct syntax for decIf the definition is provided in the header file that we include, then ___________.

The program can run successfully

The program must also define the extern variable

The extern variable must have two definitions

Memory is not allocated for extern variables

10. The extern variable cannot be used in the programlaring an extern variable?

extern data_type variable_name;

extern variable_name;

data_type variable_name extern;

extern (data_type)variable_name;

Test Name:	OOP Extern Variable Quiz
Subject Category:	Computer Science
Test Type:	Multiple Choice Questions
Total Score / Questions:	10 / 10
Time Allowed:	10 Min
Who Should Practice this Test:	Students, job seekers, or professionals preparing for competitive exams and interviews.

OOP Extern Variable MCQ Quiz Online Practice Test