1 $Which of the following best describes a void pointer in C++?$

A.

A pointer that can point to any data type

B.

A pointer that is automatically initialized to NULL

C.

A pointer that points to a function with void return type

D.

A pointer that points to a specific data type but has no value

2 $If 'ptr' is an integer pointer holding the address 1000, and the size of an integer is 4 bytes, what will be the address after executing 'ptr + 1'?$

A.

1004

B.

1000

C.

1002

D.

1001

3 $Which operator is used to access the value pointed to by a pointer?$

A.

.

B.

*

C.

->

D.

&

4 $What is a pointer to a pointer?$

A.

A pointer holding the value of a variable

B.

A pointer holding the address of another pointer

C.

A reference variable

D.

A constant pointer

5 $Which scenario results in a 'Dangling Pointer'?$

A.

When a void pointer is used

B.

When a pointer is assigned NULL

C.

When a pointer points to a memory location that has been deleted or freed

D.

When a pointer is declared but not initialized

6 $What is a 'Wild Pointer'?$

A.

A pointer declared but not initialized

B.

A pointer pointing to the base class

C.

A pointer pointing to a valid object

D.

A pointer set to nullptr

7 $Which keyword is used in C++11 and later to represent a null pointer safely?$

A.

void

B.

nil

C.

NULL

D.

nullptr

8 $When a class contains a pointer member, what specific member function is often required to prevent shallow copy issues?$

A.

Default Constructor

B.

Friend Function

C.

Static Constructor

D.

Copy Constructor

9 $Which operator is used to access members of a class through a pointer to an object?$

A.

::

B.

->

C.

&

D.

.

10 $The 'this' pointer is accessible:$

A.

In static member functions

B.

Outside the class only

C.

In non-static member functions

D.

In friend functions

11 $What is the type of the 'this' pointer in a non-const member function of class X?$

A.

const X*

B.

X* const

C.

X&

D.

X*

12 $How do you declare an array of 10 objects of class 'Student'?$

A.

Student *arr = new Student;

B.

Student arr;

C.

arr<Student> 10;

D.

Student arr[10];

13 $When declaring an array of objects, which constructor is invoked for each element?$

A.

Default constructor

B.

Copy constructor

C.

Destructor

D.

Parameterized constructor

14 $Which header file is required to use the Standard C++ string class?$

A.

<stdlib.h>

B.

<string.h>

C.

<string>

D.

<cstring>

15 $Which operator is used to concatenate two C++ string objects?$

A.

.

B.

->

C.

&

D.

+

16 $What is the difference between string::length() and string::size()?$

A.

length() is for C-strings, size() is for objects

B.

length() returns bytes, size() returns characters

C.

There is no difference; they are synonyms

D.

size() includes the null terminator, length() does not

17 $Which function is used to convert a C++ string object to a C-style string (char*)?$

A.

convert()

B.

get_string()

C.

to_char()

D.

c_str()

18 $Which string member function checks if the string is empty?$

A.

clear()

B.

null()

C.

empty()

D.

void()

19 $How does a reference variable differ from a pointer regarding initialization?$

A.

Pointers must be initialized at declaration; references do not have to be

B.

Both must be initialized at declaration

C.

Neither requires initialization at declaration

D.

References must be initialized at declaration; pointers do not have to be

20 $Can a reference variable be reassigned to refer to a different variable after initialization?$

A.

Yes, anytime

B.

Yes, but only once

C.

Yes, if casted

D.

No, it cannot be reassigned

21 $Which of the following is valid syntax for declaring a reference to an integer 'a'?$

A.

int &r = a;

B.

int r = &a;

C.

int *r = a;

D.

int &r = &a;

22 $In a 2D array declaration 'int arr[3][4]', what does '3' represent?$

A.

The number of rows

B.

The size of each element

C.

The total number of elements

D.

The number of columns

23 $How are elements of a multidimensional array stored in memory in C++?$

A.

Linked list format

B.

Random order

C.

Row-major order

D.

Column-major order

24 $Which is the correct syntax to define a pointer to a data member of class 'Test' of type int?$

A.

int *Test::ptr;

B.

int Test::*ptr;

C.

int &Test::ptr;

D.

Test::int *ptr;

25 $Which operator is used to access a data member using a pointer to data member and an object instance?$

A.

->*

B.

.*

C.

.

D.

::

26 $If string s = "Hello";, what does s.at(1) return?$

A.

o

B.

l

C.

H

D.

e

27 $What happens if you try to modify a string literal assigned to a char* in C++? (e.g., char* p = "Hello"; p[0] = 'X';)$

A.

The string changes successfully

B.

Compiler error always

C.

Undefined behavior (often a segmentation fault)

D.

The pointer becomes null

28 $Which modifier function appends a string to the end of the current string object?$

A.

push_back()

B.

insert()

C.

append()

D.

attach()

29 $What does the following pointer arithmetic expression result in? void *p; p++;$

A.

Advances by 4 bytes

B.

Compiler Error or Non-standard extension

C.

Resets pointer to NULL

D.

Advances by 1 byte

30 $When passing a multidimensional array to a function, which dimension must be specified?$

A.

Only the first dimension

B.

No dimensions are needed

C.

All dimensions except the first

D.

All dimensions except the last

31 $Can a reference variable accept a NULL value?$

A.

Yes

B.

No

C.

Only static references

D.

Only const references

32 $Given int x = 10; int *p = &x; int **q = &p;, what does **q access?$

A.

The address of x

B.

The value of x

C.

The value of p

D.

The address of p

33 $Which statement correctly deletes an array of objects allocated with new ?$

A.

delete[] array;

B.

free(array);

C.

remove array;

D.

delete array;

34 $What is the purpose of the getline(cin, str) function?$

A.

To print a line of text

B.

To read a single character

C.

To read a string stopping at whitespace

D.

To read a line of text including spaces

35 $In string::npos, what does npos usually represent?$

A.

A null pointer

B.

Zero

C.

The maximum possible value for size_t, indicating 'not found'

D.

The start of the string

36 $Which string function replaces a part of the string with another string?$

A.

sub()

B.

replace()

C.

swap()

D.

exchange()

37 $If a class has a constant member function, can it modify data members pointed to by the this pointer?$

A.

Yes, always

B.

Only if the members are static

C.

Only if the members are mutable

D.

No, never

38 $What is the output of comparing two string objects using == ?$

A.

Compares memory addresses

B.

Compares string lengths

C.

Compares content lexicographically

D.

Always returns true

39 $Which allows a pointer to be modified but the data it points to cannot be changed?$

A.

const int * const ptr

B.

int * const ptr

C.

int & ptr

D.

const int * ptr

40 $What does int * const ptr define?$

A.

A pointer to a constant integer

B.

A reference to an integer

C.

A constant pointer to a constant integer

D.

A constant pointer to an integer

41 $Which operator allows accessing members of an object using a pointer to a member function (func_ptr) and a pointer to an object (obj_ptr)?$

A.

(obj_ptr->*func_ptr)()

B.

obj_ptr.*func_ptr()

C.

obj_ptr->func_ptr()

D.

(obj_ptr.*func_ptr)()

42 $Why is string s; cin >> s; potentially problematic for reading names like "New York"?$

A.

It only reads "New" and leaves "York" in the buffer

B.

It cannot read characters

C.

It crashes on capital letters

D.

It requires a char array

43 $How do you access the element at row 1, column 2 of a 2D array named matrix ?$

A.

matrix[1,2]

B.

matrix{1}{2}

C.

matrix(1,2)

D.

matrix[1][2]

44 $What happens when you assign one C++ string object to another (e.g., str1 = str2)?$

A.

It moves the data

B.

It copies the content (deep copy)

C.

It results in an error

D.

It copies the address (shallow copy)

45 $Can an array be a data member of a class?$

A.

Yes

B.

Only if it is const

C.

No, only pointers

D.

Only if it is static

46 $Which string method returns a substring?$

A.

part()

B.

cut()

C.

slice()

D.

substr()

47 $If p is a null pointer, what is the result of delete p; ?$

A.

Nothing happens (it is safe)

B.

Compiler error

C.

Runtime crash

D.

Memory leak

48 $What is the specific issue called when delete is forgotten for memory allocated with new ?$

A.

Segmentation fault

B.

Wild pointer

C.

Memory leak

D.

Dangling pointer

49 $Which of the following correctly declares a pointer to a function that takes an int and returns void?$

A.

*void func(int);

B.

void func(int);

C.

void (*func)(int);

D.

void *func(int);

50 $In pointer arithmetic, subtracting two pointers of the same type results in:$

A.

The number of elements between them

B.

The number of bytes between them

C.

Compiler error

D.

The sum of their addresses

Unit 2 - Practice Quiz