Free Test Defining classes and o... – C++ Lan...

Q1: Which keyword is used to define a class in C++?

A. class B. object C. struct D. define

Q2: How do you create an object of a class named "Car"?

A. Car obj; B. object Car; C. class Car obj; D. new Car();

Q3: Where are data members declared in a class?

A. Inside the class B. Outside the class C. In the main function D. In the constructor

Q4: Which section of a class controls access to its members?

A. Access specifiers B. Data types C. Functions D. Macros

Q5: What is the default access specifier for members of a class?

A. private B. public C. protected D. friend

Q6: What syntax is used to define a member function outside the class?

A. ReturnType ClassName::FunctionName() B. ClassName.FunctionName() C. FunctionName::ClassName() D. FunctionName.ClassName()

Q7: Which of the following correctly declares a constructor?

A. ClassName(); B. void ClassName(); C. int ClassName(); D. new ClassName();

Q8: How do you access a public data member "age" of an object "obj"?

A. obj.age B. obj->age C. obj::age D. age.obj

Q9: What is the purpose of the "this" pointer?

A. To refer to the current object B. To refer to the base class C. To define new classes D. To overload operators

Q10: What happens if no constructor is defined in a class?

A. Compiler provides a default constructor B. Compilation error C. Object cannot be created D. Runtime error

Q11: How do you define a private data member "id" inside a class?

A. private: int id; B. public: int id; C. protected: int id; D. int id;

Q12: Which keyword is used to make class members accessible from outside?

A. public B. private C. protected D. friend

Q13: What is an object?

A. Instance of a class B. A class definition C. A function D. A variable

Q14: Which operator is used to access members via a pointer to an object?

A. -> B. . C. :: D. *

Q15: How to declare a member function inside a class?

A. ReturnType FunctionName(); B. FunctionName(); C. ReturnType FunctionName; D. ReturnType ClassName::FunctionName();

Q16: Which of the following correctly defines an empty class named "Test"?

A. class Test {}; B. class Test; C. class Test(); D. class Test() {};

Q17: Which of these statements about classes is TRUE?

A. Classes can contain data members and member functions B. Classes cannot have member functions C. Classes do not support access specifiers D. Classes are only used in procedural programming

Q18: How do you declare a static data member inside a class?

A. static int count; B. int static count; C. static count int; D. int count static;

Q19: Can a class have private constructors?

A. Yes B. No C. Only in C D. Only in structs

Q20: What is the size of an empty class in C++?

A. 1 byte B. 0 bytes C. Depends on compiler D. 4 bytes

Quiz for Defining classes and objects