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

A.

A pointer that points to a function with void return type

B.

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

C.

A pointer that can point to any data type

D.

A pointer that is automatically initialized to NULL

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.

1001

B.

1000

C.

1004

D.

1002

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 reference variable

B.

A constant pointer

C.

A pointer holding the address of another pointer

D.

A pointer holding the value of a variable

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

A.

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

B.

When a pointer is declared but not initialized

C.

When a void pointer is used

D.

When a pointer is assigned NULL

6 $What is a 'Wild Pointer'?$

A.

A pointer set to nullptr

B.

A pointer declared but not initialized

C.

A pointer pointing to a valid object

D.

A pointer pointing to the base class

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

A.

void

B.

nullptr

C.

nil

D.

NULL

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

A.

Friend Function

B.

Static Constructor

C.

Copy Constructor

D.

Default 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.

Outside the class only

B.

In non-static member functions

C.

In friend functions

D.

In static member functions

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

A.

X&

B.

const X*

C.

X* const

D.

X*

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

A.

Student arr;

B.

Student *arr = new Student;

C.

arr<Student> 10;

D.

Student arr[10];

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

A.

Parameterized constructor

B.

Destructor

C.

Copy constructor

D.

Default constructor

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

A.

<stdlib.h>

B.

<cstring>

C.

<string.h>

D.

<string>

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() returns bytes, size() returns characters

B.

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

C.

There is no difference; they are synonyms

D.

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

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

A.

c_str()

B.

convert()

C.

to_char()

D.

get_string()

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

A.

null()

B.

empty()

C.

clear()

D.

void()

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

A.

Both must be initialized at declaration

B.

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

C.

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

D.

Neither requires initialization at declaration

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

A.

Yes, but only once

B.

No, it cannot be reassigned

C.

Yes, anytime

D.

Yes, if casted

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 total number of elements

B.

The number of rows

C.

The size of each element

D.

The number of columns

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

A.

Random order

B.

Column-major order

C.

Row-major order

D.

Linked list format

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.

Test::int *ptr;

C.

int *Test::ptr;

D.

int &Test::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.

e

C.

l

D.

H

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.

The pointer becomes null

D.

Undefined behavior (often a segmentation fault)

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

A.

insert()

B.

append()

C.

attach()

D.

push_back()

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

A.

Compiler Error or Non-standard extension

B.

Resets pointer to NULL

C.

Advances by 1 byte

D.

Advances by 4 bytes

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

A.

Only the first dimension

B.

All dimensions except the first

C.

All dimensions except the last

D.

No dimensions are needed

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

A.

Only static references

B.

Only const references

C.

Yes

D.

No

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

A.

The address of x

B.

The address of p

C.

The value of x

D.

The value of p

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

A.

remove array;

B.

free(array);

C.

delete 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 line of text including spaces

C.

To read a single character

D.

To read a string stopping at whitespace

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

A.

The start of the string

B.

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

C.

A null pointer

D.

Zero

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

A.

sub()

B.

exchange()

C.

replace()

D.

swap()

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

A.

Only if the members are static

B.

Only if the members are mutable

C.

No, never

D.

Yes, always

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

A.

Compares content lexicographically

B.

Always returns true

C.

Compares string lengths

D.

Compares memory addresses

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

A.

const int * ptr

B.

const int * const ptr

C.

int * const ptr

D.

int & ptr

40 $What does int * const ptr define?$

A.

A constant pointer to an integer

B.

A reference to an integer

C.

A pointer to a constant integer

D.

A constant pointer to a constant 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 crashes on capital letters

C.

It requires a char array

D.

It cannot read characters

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 copies the address (shallow copy)

B.

It copies the content (deep copy)

C.

It results in an error

D.

It moves the data

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

A.

Only if it is static

B.

No, only pointers

C.

Only if it is const

D.

Yes

46 $Which string method returns a substring?$

A.

substr()

B.

slice()

C.

part()

D.

cut()

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

A.

Compiler error

B.

Nothing happens (it is safe)

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.

Dangling pointer

C.

Memory leak

D.

Wild 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 sum of their addresses

C.

Compiler error

D.

The number of bytes between them

Unit 2 - Practice Quiz