Question 21 : Which of the following is correct about class and structure?
1. class can have member functions while structure cannot.
2. class data members are public by default while that of structure are private.
3. Pointer to structure or classes cannot be declared.
4. class data members are private by default while that of structure are public by default.
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Question 22 : Which one of the following options is correct about the statement given below? The compiler checks the type of reference in the object and not the type of object.
1. Inheritance
2. Polymorphism
3. Abstraction
4. Encapsulation
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Question 23 : Which of the following problem causes an exception?
1. Missing semicolon in statement in main().
2. A problem in calling function.
3. A syntax error.
4. A run-time error.
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Question 24 : Which of the following functions are performed by a constructor?
1. Construct a new class
2. Construct a new object
3. Construct a new function
4. Initialize objects
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Question 25 : Which of the following cannot be used with the keyword virtual?
1. class
2. member functions
3. constructor
4. destructor
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Question 26 : Which of the following is the correct class of the object cout?
1. iostream
2. istream
3. ostream
4. ifstream
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Question 27 : Which of the following ways are legal to access a class data member using this pointer?
1. this->x
2. this.x
3. *this.x
4. *this-x
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Question 28 : Which of the following factors supports the statement that reusability is a desirable feature of a language?
1. It decreases the testing time
2. It lowers the maintenance cost.
3. It reduces the compilation time.
4. Both A and B.
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Question 29 : Which of the following concepts is used to implement late binding?
1. Virtual function
2. Operator function
3. Const function
4. Static function
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Question 30 : Which of the following is the correct way of declaring a function as constant?
1. const int ShowData(void) { /* statements */ }
2. int const ShowData(void) { /* statements */ }
3. int ShowData(void) const { /* statements */ }
4. Both A and B
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