Object Oriented Programming Set 1 MCQs

Q1 | Every class has at least one constructor function, even when none is declared.

true

false

Q2 | Can constructors be overloaded?

true

false

Q3 | What is the difference between struct and class in terms of Access Modifier?

by default all the struct members are private while by default class members are public.

by default all the struct members are protected while by default class members are private.

by default all the struct members are public while by default class members are private.

by default all the struct members are public while by default class members are protected.

Q4 | An abstract class can be instantiated.

true

false

Q5 | The default access level assigned to members of a class is

private

public

protected

needs to be assigned

Q6 | There is nothing like a virtual constructor of a class.

true

false

Q7 | Which of the following operators allow defining the member functions of a class outside the class?

::

?

:?

%

Q8 | Which type of class has only one unique value for all the objects of that same class?

this

friend

static

both a and b

Q9 | Which one of the following is not a fundamental data type in C++?

float

string

int

char

Q10 | What is a constructor?

a class automatically called whenever a new object of this class is created.

a class automatically called whenever a new object of this class is destroyed.

a function automatically called whenever a new object of this class is created.

a function automatically called whenever a new object of this class is destroyed.

Q11 | Under what conditions a destructor destroys an object?

scope of existence has finished

object dynamically assigned and it is released using the operator delete.

program terminated.

both a and b.

Q12 | When class B is inherited from class A, what is the order in which the constructers of those classes are called

class a first class b next

class b first class a next

class b's only as it is the child class

class a's only as it is the parent class

Q13 | Which one of the following is not a valid reserved keyword in C++?

explicit

public

implicit

private

Q14 | Variables declared in the body of a particular member function are known as data members and can be used in all member functions of the class.

true

false

Q15 | In a class definition, data or functions designated private are accessible

to any function in the program.

only if you know the password.

to member functions of that class.

only to public members of the class.

Q16 | A member function can always access the data

in the object of which it is a member.

in the class of which it is a member.

in any object of the class of which it is a member.

in the public part of its class.

Q17 | Classes are useful because they

can closely model objects in the real world.

permit data to be hidden from other classes.

bring together all aspects of an entity in one place.

options a, b and c

Q18 | For the object for which it was called, a const member function

can modify both const and non-const member data.

can modify only const member data.

can modify only non-const member data.

can modify neither const nor non-const member data.

Q19 | Dividing a program into functions

is the key to object-oriented programming.

makes the program easier to conceptualize.

may reduce the size of the program.

option b and c

Q20 | An expression

usually evaluates to a numerical value.

may be part of a statement.

always occurs outside a function.

option a and b

Q21 | A variable of type char can hold the value 301.

true

false

Q22 | In an assignment statement, the value on the left of the equal sign is always equal to the value on the right.

true

false

Q23 | It’s perfectly all right to use variables of different data types in the same arithmetic expression.

true

false

Q24 | A function’s single most important role is to

give a name to a block of code.

reduce program size.

accept arguments and provide a return value.

help organize a program into conceptual units.

Q25 | A function argument is

a variable in the function that receives a value from the calling program.

a way that functions resist accepting the calling program’s values.

a value sent to the function by the calling program.

a value returned by the function to the calling program.