1 $Which header file is required to perform file input/output operations in C++?$

A.

<iostream>

B.

<stdio.h>

C.

<fstream>

D.

<conio.h>

2 $Which class is used specifically for writing data to a file?$

A.

ofstream

B.

filebuf

C.

ostream

D.

ifstream

3 $Which class is used specifically for reading data from a file?$

A.

iostream

B.

fstream

C.

ifstream

D.

ofstream

4 $What is the return type of a constructor?$

A.

void

B.

class type

C.

No return type

D.

int

5 $Which file mode is used to append content to the end of an existing file?$

A.

ios::ate

B.

ios::trunc

C.

ios::out

D.

ios::app

6 $Which symbol is used to prefix the destructor name?$

A.

@

B.

~

C.

#

D.

!

7 $Which function is used to close a file explicitly in C++?$

A.

finish()

B.

end()

C.

stop()

D.

close()

8 $What happens if a file is opened in 'ios::out' mode and the file already exists?$

A.

The file contents are truncated (deleted)

B.

Data is appended

C.

An error occurs

D.

The file is opened in read-only mode

9 $Which constructor is called when an object is initialized with another object of the same class?$

A.

Copy Constructor

B.

Dynamic Constructor

C.

Parameterized Constructor

D.

Default Constructor

10 $Which syntax correctly defines a copy constructor for class 'A'?$

A.

A(const A &obj)

B.

A(A obj)

C.

void A(A obj)

D.

A(A *obj)

11 $What is the purpose of the 'write()' function in file handling?$

A.

To write formatted text

B.

To write a string

C.

To write binary data blocks

D.

To write a single character

12 $Which function is used to move the get pointer (input pointer) in a file?$

A.

seekg()

B.

tellg()

C.

tellp()

D.

seekp()

13 $What does 'ios::binary' mode do?$

A.

Encrypts the file

B.

Opens file for text operations

C.

Compresses the file

D.

Opens file in binary mode preventing character translation

14 $Which function returns the current position of the output pointer?$

A.

tellg()

B.

getpos()

C.

seekp()

D.

tellp()

15 $When is a destructor called?$

A.

When the program starts

B.

Manually by the programmer only

C.

When an object goes out of scope

D.

When an object is created

16 $Can a constructor be overloaded?$

A.

Only in derived classes

B.

Yes

C.

Only if virtual

D.

No

17 $What is an Initializer List used for?$

A.

Initializing file modes

B.

Initializing data members before the constructor body executes

C.

Listing all classes

D.

Listing friend functions

18 $Which member must be initialized using an initializer list?$

A.

Pointer members

B.

Public members

C.

Constant members

D.

Static members

19 $What is the correct syntax to read an object 'obj' of class 'Student' from a binary file using ifstream object 'fin'?$

A.

fin >> obj;

B.

fin.read((char*)&obj, sizeof(obj));

C.

fin.read(obj, sizeof(obj));

D.

fin.get(obj);

20 $What is the default access mode for an 'ofstream' object?$

A.

ios::ate

B.

ios::app

C.

ios::in

D.

ios::out

21 $Which function checks if the End-Of-File has been reached?$

A.

end()

B.

is_open()

C.

eof()

D.

finish()

22 $How many destructors can a class have?$

A.

Zero

B.

Unlimited

C.

Only one

D.

Two

23 $If a programmer does not define any constructor, what does the compiler do?$

A.

Throws an error

B.

Supplies a parameterized constructor

C.

Supplies a default constructor

D.

Does nothing

24 $What is the output of sizeof(fstream) roughly dependent on?$

A.

The number of files open

B.

Always 0

C.

The file size

D.

The buffer size and internal state variables

25 $Which combination of modes allows reading and writing to a file while preserving original content?$

A.

ios::in | ios::trunc

B.

ios::in | ios::out

C.

ios::out

D.

ios::out | ios::trunc

26 $Which stream function reads a line of text, including spaces?$

A.

getline()

B.

read()

C.

cin >>

D.

get()

27 $Which flag sets the file pointer to the end of the file immediately after opening?$

A.

ios::tail

B.

ios::term

C.

ios::ate

D.

ios::end

28 $What implies 'Random Access' in file handling?$

A.

Opening files with random names

B.

Reading files randomly from disk

C.

Accessing data at any position directly without reading sequentially

D.

Creating random data

29 $Can a destructor accept arguments?$

A.

No, never

B.

Only integers

C.

Yes, if they are default arguments

D.

Yes, always

30 $What is a parameterized constructor?$

A.

A constructor that takes arguments

B.

A constructor that is private

C.

A constructor that returns a pointer

D.

A constructor with no code

31 $Which seek direction moves the pointer relative to the beginning of the file?$

A.

ios::start

B.

ios::beg

C.

ios::cur

D.

ios::end

32 $When working with Structures and Files, why is reinterpret_cast or C-style cast used in write ?$

A.

To encrypt data

B.

To increase writing speed

C.

To format the text

D.

To convert the structure pointer to a char pointer for byte-wise writing

33 $Which of the following constitutes a default constructor?$

A.

A(int x)

B.

A()

C.

Both A(int x = 0) and A()

D.

A(int x = 0)

34 $If a class has a pointer member, what is the risk of using the default copy constructor?$

A.

Shallow copy leading to dangling pointers

B.

Deep copy is performed

C.

Compiler error

D.

Memory leak immediately

35 $Which function puts a single character into the file stream?$

A.

write()

B.

get()

C.

put()

D.

peek()

36 $In file.seekg(n, ios::cur);, what does n represent?$

A.

The number of bytes to move offset

B.

The file mode

C.

The line number

D.

The absolute position

37 $Which mode is required to perform input and output operations on the same file using fstream ?$

A.

ios::app

B.

ios::in | ios::out

C.

ios::out

D.

ios::in

38 $The order of destruction of objects is:$

A.

Reverse of construction

B.

Same as construction

C.

Dependent on size

D.

Random

39 $Which error handling function returns true if a non-fatal error (like format mismatch) occurs?$

A.

eof()

B.

bad()

C.

fail()

D.

good()

40 $Can a constructor accept a reference to its own class type as a value parameter (e.g. A(A a))?$

A.

No

B.

Only for temporary objects

C.

Only in main

D.

Yes

41 $What is the main advantage of using binary files over text files for storing objects?$

A.

Portability across different OS

B.

Human readability

C.

Easier debugging

D.

Efficiency and direct memory mapping

42 $The open() function takes how many arguments generally?$

A.

3 (Filename, Mode, Buffer)

B.

2 (Filename and Mode)

C.

1 (Filename only)

D.

0

43 $What is a deep copy?$

A.

Allocating new memory and copying the actual data

B.

Copying the object to a file

C.

Copying the address of pointers only

D.

Copying private members only

44 $Which symbol is used for the Initializer List syntax?$

A.

::

B.

:

C.

.

D.

->

45 $If fstream file; is declared, which function opens the file?$

A.

file.start()

B.

file.open()

C.

file.init()

D.

file.create()

46 $When using ios::trunc, what happens to the existing file content?$

A.

It is moved to end

B.

It is completely removed

C.

It is saved

D.

It is encrypted

47 $Can constructors be declared as private ?$

A.

Yes, to prevent object creation from outside the class

B.

Only in structs

C.

Yes, but it causes a syntax error

D.

No, never

48 $What happens if a destructor is not virtual in a base class when deleting a derived class object via a base pointer?$

A.

Compilation error

B.

Derived class destructor is not called (memory leak)

C.

Runtime crash immediately

D.

Everything works fine

49 $Which function returns the current get position in an input stream?$

A.

tellg()

B.

seekg()

C.

seekp()

D.

tellp()

50 $In the context of file modes, what does ios::ate stand for?$

A.

At The End

B.

Allocate To Entry

C.

Append To End

D.

After The EOF

Unit 3 - Practice Quiz