sinfoera.com – MCQs, Mock Tests | C C C Programming -Constructors and Destructors

1 ï»¿A constructor that accepts __________ parameters is called the default constructor.

A one B two C no D three

✅ Correct Answer: 3

2 What happens when a class with parameterized constructors and having no default constructor is used in a program and we create an object that needs a zero-argument constructor?

A Compile-time error. B Preprocessing error. C Runtime error. D Runtime exception.

✅ Correct Answer: 1

3 Destructor has the same name as the constructor and it is preceded by ______ .

A ! B ? C ~ D $

✅ Correct Answer: 3

4 For automatic objects, constructors and destructors are called each time the objects

A enter and leave scope B inherit parent class C are constructed D are destroyed

✅ Correct Answer: 1

5 Which constructor function is designed to copy objects of the same class type?

A Create constructor B Object constructor C Dynamic constructor D Copy constructor

✅ Correct Answer: 4

6 Which of the following statement is correct?

A Constructor has the same name as that of the class. B Destructor has the same name as that of the class with a tilde symbol at the beginning. C Both A and B. D Destructor has the same name as the first member function of the class.

✅ Correct Answer: 3

7 Which of the following statement is incorrect?

A Constructor is a member function of the class. B The compiler always provides a zero argument constructor. C It is necessary that a constructor in a class should always be public. D Both B and C.

✅ Correct Answer: 4

8 When are the Global objects destroyed?

A When the control comes out of the block in which they are being used. B When the program terminates. C When the control comes out of the function in which they are being used. D As soon as local objects die.

✅ Correct Answer: 2

9 Copy constructor must receive its arguments by __________ .

A either pass-by-value or pass-by-reference B only pass-by-value C only pass-by-reference D only pass by address

✅ Correct Answer: 3

10 A function with the same name as the class, but preceded with a tilde character (~) is called __________ of that class.

A constructor B destructor C function D object

✅ Correct Answer: 2

11 A union that has no constructor can be initialized with another union of __________ type.

A different B same C virtual D class

✅ Correct Answer: 2

12 Which of the following gets called when an object goes out of scope?

A constructor B destructor C main D virtual function

✅ Correct Answer: 2

13 Which of the following statement is correct?

A Destructor destroys only integer data members of the object. B Destructor destroys only float data members of the object. C Destructor destroys only pointer data members of the object. D Destructor destroys the complete object.

✅ Correct Answer: 4

14 ________ used to make a copy of one class object from another class object of the same class type.

A constructor B copy constructor C destructor D default constructor

✅ Correct Answer: 2

15 Constructors __________ to allow different approaches of object construction.

A cannot overloaded B can be overloaded C can be called D can be nested

✅ Correct Answer: 2

16 Which of the following statement is correct?

A A destructor has the same name as the class in which it is present. B A destructor has a different name than the class in which it is present. C A destructor always returns an integer. D A destructor can be overloaded.

✅ Correct Answer: 1

17 Which of the following cannot be declared as virtual?

A Constructor B Destructor C Data Members D Both A and C

✅ Correct Answer: 4

18 If the copy constructor receives its arguments by value, the copy constructor would

A call one-argument constructor of the class B work without any problem C call itself recursively D call zero-argument constructor

✅ Correct Answer: 3

19 Which of the following are NOT provided by the compiler by default?

A Zero-argument Constructor B Destructor C Copy Constructor D Copy Destructor

✅ Correct Answer: 4

20 It is a __________ error to pass arguments to a destructor.

A logical B virtual C syntax D linker

✅ Correct Answer: 3

21 If the programmer does not explicitly provide a destructor, then which of the following creates an empty destructor?

A Preprocessor B Compiler C Linker D main() function

✅ Correct Answer: 2

22 A __________ is a constructor that either has no parameters, or if it has parameters, all the parameters have default values

A default constructor B copy constructor C Both A and B D None of these

✅ Correct Answer: 1

23 How many default constructors per class are possible?

A Only one B Two C Three D Unlimited

✅ Correct Answer: 1

24 Which of the following statement is correct about destructors?

A A destructor has void return type. B A destructor has integer return type. C A destructor has no return type. D A destructors return type is always same as that of main().

✅ Correct Answer: 3

25 Which of the following statement is correct?

A A constructor has the same name as the class in which it is present. B A constructor has a different name than the class in which it is present. C A constructor always returns an integer. D A constructor cannot be overloaded.

✅ Correct Answer: 1

26 Which of the following implicitly creates a default constructor when the programmer does not explicitly define at least one constructor for a class?

A Preprocessor B Linker C Loader D Compiler

✅ Correct Answer: 4

27 A destructor takes __________ arguments.

A one B two C three D no

✅ Correct Answer: 4

28 Destructor calls are made in which order of the corresponding constructor calls?

A Reverse order B Forward order C Depends on how the object is constructed D Depends on how many objects are constructed

✅ Correct Answer: 1

29 Which of the following never requires any arguments?

A Member function B Friend function C Default constructor D const function

✅ Correct Answer: 3

30 A class's __________ is called when an object is destroyed.

A constructor B destructor C assignment function D copy constructor

✅ Correct Answer: 2

31 Destructors __________ for automatic objects if the program terminates with a call to function exit or function abort.

A are called B are inherited C are not called D are created

✅ Correct Answer: 3

32 Which of the following statement is correct?

A A constructor of a derived class can access any public and protected member of the base class. B Constructor cannot be inherited but the derived class can call them. C A constructor of a derived class cannot access any public and protected member of the base class. D Both A and B.

✅ Correct Answer: 4

33 Which of the following statements are correct?

A Constructor is always called explicitly. B Constructor is called either implicitly or explicitly, whereas destructor is always called implicitly. C Destructor is always called explicitly. D Constructor and destructor functions are not called at all as they are always inline.

✅ Correct Answer: 2

34 How many times a constructor is called in the life-time of an object?

A Only once B Twice C Thrice D Depends on the way of creation of object

✅ Correct Answer: 1

35 Which of the following gets called when an object is being created?

A constructor B virtual function C destructor D main

✅ Correct Answer: 1

36 To ensure that every object in the array receives a destructor call, always delete memory allocated as an array with operator __________ .

A destructor B delete C delete[] D kill[]

✅ Correct Answer: 3

37 Which of the following statement is correct about constructors?

A A constructor has a return type. B A constructor cannot contain a function call. C A constructor has no return type. D A constructor has a void return type.

✅ Correct Answer: 3

38 Which of the following statement is correct whenever an object goes out of scope?

A The default constructor of the object is called. B The parameterized destructor is called. C The default destructor of the object is called. D None of the above.

✅ Correct Answer: 3

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C Programming -Constructors and Destructors