OOP MCQs Unit I - OOP Multiple Choice Questions PDF

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OOP Multiple Choice Questions...

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Id Question A B C D Answer Marks Unit

1 Every class has at least one constructor function, even when none is declared. TRUE FALSE

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2 Can constructors be overloaded? TRUE FALSE

Id Question A B

3 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. C 1 I

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A 1 I

A 1 I

4 An abstract class can be instantiated. TRUE FALSE

B

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1 I

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5 The default access level assigned to members of a class is ______ Private Public Protected Needs to be assigned A 1 I

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6 There is nothing like a virtual constructor of a class. TRUE FALSE

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7 Which of the following operators allow defining the member functions of a class outside the class? :: ? :? % A 1 I

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8 Which type of class has only one unique value for all the objects of that same class? This Friend Static Both a and b C

B 1 I

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1 I

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9 Which one of the following is not a fundamental data type in C++? Float string Int Char B 1 I

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10 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. C 1 I

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11 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. D 1 I

Id Question

12 If a member needs to have unique value for all the objects of that same class, declare the member as Global variable outside class

A

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Local variable inside constructor Static variable inside class Dynamic variable inside class B 1 I

Id Question

13 If a member needs to have unique value for all the objects of that same class, declare the member as Global variable outside class Local variable inside constructor Static variable inside class Dynamic variable inside class B 1 I

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14 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 A 1 I

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15

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Which one of the following is not a valid reserved keyword in C++? Explicit Public Implicit Private C 1 I

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16 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

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B 1 I

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17 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. C 1 I

Id Question A

18 A member function can always access the data in the object of which it is a member.

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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. A 1 I

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19 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 D 1 I

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20 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. D 1 I

Id Question A B C

21 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.

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Option B and C D 2 I

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22 An expression usually evaluates to a numerical value. may be part of a statement. always occurs outside a function. Option A and B D 2 I

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23 A variable of type char can hold the value 301. TRUE FALSE

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24 In an assignment statement, the value on the left of the equal sign is always equal to the value on the right. TRUE FALSE

A B

B 1 I

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B 1 I

25 It’s perfectly all right to use variables of different data types in the same arithmetic expression. TRUE FALSE

A 1 I

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26 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. D 1 I

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27 A function argument is

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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. C 1 I

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28 When arguments are passed by value, the function works with the original arguments in the calling program. TRUE FALSE

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B 1 I

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29 Which of the following can legitimately be passed to a function? A constant A variable A structure All of the above D 1 I

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30 How many values can be returned from a function? 0 1 2 3 B 1 I

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31 When a function returns a value, the entire function call can appear on the right side of the equal sign and be assigned to another variable. TRUE FALSE

A 1 I

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32 When an argument is passed by reference a variable is created in the function to hold the argument’s value. the function cannot access the argument’s value. a temporary variable is created in the calling program to hold the argument’s value. the function accesses the argument’s original value in the calling program. D 1 I

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33 Overloaded functions are a group of functions with the same name. all have the same number and types of arguments. make life simpler for programmers. A and C D 2 I

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34 A default argument has a value that may be supplied by the calling program. may be supplied by the function. must have a constant value. A and B 1 1 I

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35 A static local variable is used to make a variable visible to several functions. make a variable visible to only one function. retain a value when a function is not executing. B and C D 2 I

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36 In C++ there can be an array of four dimensions. TRUE FALSE

A 1 I

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37 When an array name is passed to a function, the function accesses exactly the same array as the calling program. refers to the array using a different name than that used by the calling program. refers to the array using the same name as that used by the calling program. A and B D 1 I

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38 The compiler will complain if you try to access array element 14 in a 10-element array. TRUE FALSE

B 1 I

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39 The extraction operator (>>) stops reading a string when it encounters a space. TRUE FALSE

A 1 I

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40 You can read input that consists of multiple lines of text using the normal cout...