Explore topic-wise MCQs in Computer Science Mcqs.

This section includes 144 Mcqs, each offering curated multiple-choice questions to sharpen your Computer Science Mcqs knowledge and support exam preparation. Choose a topic below to get started.

101.

Which of the following is the perfect set of operators that can’t be overloaded in CPP ?

A. +=, ?, :: , >>
B. >>, <
C. :: , . , .* , ?:
D. :: , ->, * , new, delete
Answer» D. :: , ->, * , new, delete
Discussion
102.

__________________ is the OOP feature and mechanism that binds together code and the data it manipulates, and keep both safe from outside world.

A. Data Binding
B. Data Encapsulation
C. Data Storing
D. Data Abstraction
Answer» C. Data Storing
Discussion
103.

Static variable in a class is initialized when _____ .

A. every object of the class is created.
B. last object of the class is created.
C. first object of the class is created.
D. No need to initialize static variable.
Answer» D. No need to initialize static variable.
Discussion
104.

Which of the followings are true about Virtual functions?

A. They must be non-static member function of the class
B. They cannot be friends
C. Constructor Functions cannot be virtual
D. All of these
Answer» E.
Discussion
105.

Which of the followings is/are not keyword/s in CPP? 1. asm 2. boolean 3. mutable 4. export 5. constant_cast

A. Only 5
B. Only 1 and 4
C. Only 1,2 and 5
D. Only 2 and 5
Answer» E.
Discussion
106.

Return type of uncaught_exception() is ________________ .

A. int
B. bool
C. char *
D. double
Answer» C. char *
Discussion
107.

Can we write throw clause inside catch handler?

A. Yes
B. No
Answer» B. No
Discussion
108.

Runtime polymorphism is achieved only when a virtual function is accessed through a pointer to the base class.

A. True
B. False
Answer» B. False
Discussion
109.

Find the wrong statement/s about Abstract Class.

A. We can’t create its objects.
B. We can’t create pointers to an abstract class.
C. It contains at least one pure virtual function.
D. We can create references to an abstract class.
Answer» C. It contains at least one pure virtual function.
Discussion
110.

If an argument to a function is declared as const, then _______ .

A. function can modify the argument.
B. Function can’t modify the argument.
C. const argument to a function is not possible.
D. None of these
Answer» C. const argument to a function is not possible.
Discussion
111.

Assigning one or more function body to the same name is called ____________ .

A. Function Overriding
B. Function Overloading
C. Both a and b
D. None of the above
Answer» C. Both a and b
Discussion
112.

In nested try blocks, if both inner and outer catch handlers are not able to handle the exception, then ______________ .

A. Compiler executes only executable statements of main().
B. Compiler issues compile time errors about it.
C. Program will be executed without any interrupt.
D. Program will be terminated abnormally.
Answer» E.
Discussion
113.

A friend function does not have 'this' pointer associated with it.

A. True
B. False
Answer» B. False
Discussion
114.

Default values for a function are specified when ____ .

A. function is defined
B. function is declared
C. Both a and b
D. None of these
Answer» C. Both a and b
Discussion
115.

We can initialize a value of static variable of a class only when its object is created. No other initialization is permitted.

A. True
B. False
Answer» C.
Discussion
116.

What is the difference between protected and private access specifiers in inheritance?

A. private member is not inheritable and not accessible in derived class.
B. protected member is inheritable and also accessible in derived class.
C. Both are inheritable but private is accessible in the derived class.
D. Both are inheritable but protected is not accessible in the derived class.
Answer» C. Both are inheritable but private is accessible in the derived class.
Discussion
117.

When a base class is privately inherited by the derived class, then_____________ .

A. protected members of the base class become private members of derived class
B. public members of the base class become private members of derived class
C. both a and b
D. only b
Answer» D. only b
Discussion
118.

__________ is return type of is_open() function.

A. int
B. bool
C. float
D. char *
Answer» C. float
Discussion
119.

Only functions of the class can access the data of the class and they(functions) provides the interface between data, objects and the program. This kind isolation of the data from direct access by the program is called _______________ .

A. Data Abstraction
B. Data Hiding
C. Data Binding
D. Data Encapsulation
Answer» C. Data Binding
Discussion
120.

By default, if a function with minimum lines of code is declared and defined inside the class becomes Inline function.

A. True
B. False
Answer» B. False
Discussion
121.

Public data members and member functions of the class are accessible ONLY to the member functions of that class.

A. True
B. False
Answer» C.
Discussion
122.

An exception is thrown using _____________ keyword in CPP.

A. throws
B. throw
C. threw
D. Thrown
Answer» C. threw
Discussion
123.

Which of the followings is/are not a manipulator/s ? 1. flush 2. base 3. ends 4. oct 5. bin 6. skipws

A. Only 1, 6
B. Only 1,4,6
C. Only 1,3,6
D. Only 2,5
Answer» E.
Discussion
124.

In CPP, the size of the character array should be one larger than the number of characters in the string.

A. True
B. False
Answer» B. False
Discussion
125.

When base class is derived in protected mode, then_____________ . 1. public members of base class become private members of derived class. 2. public members of base class become protected members of derived class. 3. public members of base class become public members of derived class. 4. protected members of base class become protected members of derived class. 5. protected members of base class become private members of derived class. 6. protected members of base class become public members of

A. Only 1, 5
B. Only 1, 6
C. Only 2, 6
D. Only 2, 4
Answer» E.
Discussion
126.

To perform File I/O operations, we must use _____________ header file.

A. < ifstream>
B. < ofstream>
C. < fstream>
D. Any of these
Answer» D. Any of these
Discussion
127.

Which of the following is/are valid ways to allocate memory for an integer by dynamic memory allocation in CPP?

A. int *p = new int(100);
B. int *p; p = new int; *p = 100;
C. int *p = NULL; p = new int; *p=100;
D. Only 1,2
E. All of these
Answer» F.
Discussion
128.

If default constructor is not defined, then how the objects of the class will be created?

A. The compiler will generate error
B. Error will occur at run-time.
C. Compiler provides its default constructor to build the object.
D. None of these
Answer» D. None of these
Discussion
129.

A virtual function that has no definition within the base class is called____________.

A. Pure virtual function
B. Pure static function
C. Pure Const function
D. Friend function
Answer» B. Pure static function
Discussion
130.

_________________are used for generic programming.

A. Inheritance
B. Virtual Functions
C. Templates
D. None of these
Answer» D. None of these
Discussion
131.

Object oriented programming employs_________ programming approach.

A. top-down
B. procedural
C. bottom-up
D. all of these.
Answer» D. all of these.
Discussion
132.

Constant variables can be created in CPP by using ________ .

A. enum
B. const
C. #define
D. All of these
E. None of these
Answer» E. None of these
Discussion
133.

Irrespective of exception occurrence, catch handler will always get executed.

A. True
B. False
Answer» C.
Discussion
134.

Members of the class can be declared with auto, extern or register storage classes.

A. True
B. False
Answer» C.
Discussion
135.

In CPP, cin and cout are the predefined stream __________ .

A. Operator
B. Functions
C. Objects
D. Data types
Answer» D. Data types
Discussion
136.

Can we have overloading of the function templates?

A. Yes
B. No
Answer» B. No
Discussion
137.

By default, all the files are opened in ___________mode .

A. Binary
B. Text
C. Can’t say
Answer» C. Can’t say
Discussion
138.

Is it mandatory to invoke/call a constructor for creating an object?

A. Yes
B. No
Answer» B. No
Discussion
139.

Generic catch handler must be placed at the end of all the catch handlers.

A. True
B. False
Answer» B. False
Discussion
140.

An exception can be of only built-In type.

A. True
B. False
Answer» C.
Discussion
141.

The CPP compiler supports automatic type conversions for the user defined datatypes.

A. True
B. False
Answer» C.
Discussion
142.

Can a class be declared/defined inside another class ?

A. Yes
B. No
Answer» B. No
Discussion
143.

Which of the following is CPP style type-casting?

A. per = total/(float)m
B. per = total/float(m)
C. per = (float)total/m
D. None of these
Answer» C. per = (float)total/m
Discussion
144.

By default, members of the class are ____________ in nature.

A. protected
B. private
C. public
D. static
Answer» C. public
Discussion