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Unit 4 - Practice Quiz

CSE357 50 Questions
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1 In C++, which operator is used to access the memory address of a variable?

A.
B.
C.
D. $.$

2 What is the primary difference between malloc() in C and new in C++?

A. malloc() calls the constructor, new does not.
B. new calls the constructor, malloc() does not.
C. Both call the constructor.
D. Neither calls the constructor.

3 In the context of Parameter Passing, what happens in Pass by Value?

A. The address of the actual parameter is passed to the function.
B. A copy of the actual parameter's value is passed to the function.
C. An alias to the actual parameter is created.
D. The function can directly modify the original variable.

4 Which storage class in C/C++ preserves the value of a local variable between function calls?

A. auto
B. register
C. static
D. extern

5 Which concept in OOP allows a class to derive properties and behavior from another class?

A. Polymorphism
B. Encapsulation
C. Inheritance
D. Abstraction

6 In Java, objects are stored in which area of memory?

A. Stack
B. Heap
C. Register
D. ROM

7 What is the result of dereferencing a NULL pointer in C++?

A. It returns 0.
B. It returns a random integer.
C. It causes a segmentation fault or undefined behavior.
D. It creates a new object.

8 Which of the following creates a Memory Leak?

A. Allocating memory on the stack.
B. Allocating memory on the heap and failing to free it.
C. Using a global variable.
D. Passing a pointer by reference.

9 What is Dynamic Binding (Late Binding)?

A. Linking a function call to the code to be executed at compile time.
B. Linking a function call to the code to be executed at runtime.
C. Binding variable names to memory addresses during coding.
D. Hardcoding function addresses.

10 In C++, what is the this pointer?

A. A pointer to the base class.
B. A pointer to the derived class.
C. A const pointer that points to the object invoking the member function.
D. A global pointer accessible by all classes.

11 Which Java keyword is used to prevent a class from being inherited?

A. static
B. const
C. final
D. abstract

12 In C, if int arr[5] = {1, 2, 3, 4, 5}; and int *p = arr;, what is the value of *(p + 2)?

A. 1
B. 2
C. 3
D. Address of 3

13 What is a Dangling Pointer?

A. A pointer pointing to NULL.
B. A pointer pointing to a memory location that has been deleted or freed.
C. A pointer that has not been initialized.
D. A pointer to a constant value.

14 Which feature of OOP describes wrapping data and methods into a single unit?

A. Inheritance
B. Polymorphism
C. Encapsulation
D. Recursion

15 In Java, parameter passing is always:

A. Pass by Reference
B. Pass by Value
C. Pass by Pointer
D. Pass by Name

16 What is the purpose of a Virtual Destructor in C++?

A. To delete objects faster.
B. To ensure the derived class destructor is called when deleting via a base class pointer.
C. To prevent the class from being instantiated.
D. To allow multiple inheritance.

17 Which area of memory is used for recursive function calls and local variables?

A. Heap
B. Stack
C. Data Segment
D. Code Segment

18 In C++, what is the size of an empty class?

A. 0 bytes
B. 1 byte
C. 2 bytes
D. 4 bytes

19 What is the default access specifier for members of a class in C++?

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

20 Which of the following correctly declares a pointer to a function accepting an integer and returning void in C++?

A. void *func(int);
B. void (*func)(int);
C. void func(int *);
D. *void func(int);

21 What implies the concept of Polymorphism?

A. One interface, multiple methods.
B. Hiding data implementation.
C. Creating new classes from old ones.
D. Automatic memory management.

22 What is the output of sizeof(char*) on a standard 64-bit architecture?

A. 1
B. 4
C. 8
D. 16

23 In Java, what mechanism handles the deallocation of memory on the Heap?

A. Destructors
B. free() function
C. delete operator
D. Garbage Collector

24 What is a Reference in C++?

A. A pointer that can be null.
B. An alias for an existing variable.
C. A duplicate copy of a variable.
D. A variable stored in the CPU register.

25 Which problem arises when two pointers point to the same memory location and one is freed?

A. Memory Leak
B. Dangling Pointer
C. Stack Overflow
D. Buffer Underrun

26 What is the Diamond Problem in C++?

A. A memory leak in a loop.
B. Ambiguity arising from multiple inheritance where two base classes inherit from a common ancestor.
C. A syntax error in template classes.
D. An issue with pointer arithmetic on 2D arrays.

27 What is a Pure Virtual Function in C++?

A. A function with no return type.
B. A function that cannot be overridden.
C. A virtual function initialized to 0, forcing derived classes to override it.
D. A function that does not use any variables.

28 In the context of parameter passing, what is an Activation Record?

A. A log of compilation errors.
B. A data structure stored on the stack containing local variables and return addresses for a function call.
C. A record of all heap allocations.
D. A database of class methods.

29 Which of the following is true about Pass by Reference?

A. It requires more memory than pass by value.
B. It passes a copy of the object.
C. It avoids copying large objects, improving performance.
D. It prevents the function from modifying the argument.

30 In C++, int &r = x; is an example of:

A. Pointer declaration
B. Reference declaration
C. Bitwise AND
D. Address-of operator

31 What defines a Deep Copy?

A. Copying only the pointer address.
B. Copying the object and allocating new memory for the data pointed to by the object.
C. Copying the object bit-by-bit.
D. Using the assignment operator =.

32 Which operator is used to release memory allocated by new[]?

A. delete
B. delete[]
C. free
D. remove

33 Which of the following is NOT a principle of OOP?

A. Encapsulation
B. Inheritance
C. Polymorphism
D. Compilation

34 In Java, String objects are immutable. What does this mean?

A. They cannot be deleted.
B. Their values cannot be changed after creation.
C. They are stored in the stack only.
D. They cannot be passed to functions.

35 What is the difference between struct and class in C++ regarding inheritance?

A. Structs cannot inherit.
B. Structs inherit publicly by default; classes inherit privately by default.
C. Classes cannot inherit from structs.
D. There is no difference.

36 If a recursive function does not have a base case, what error occurs?

A. Heap Overflow
B. Stack Overflow
C. Compilation Error
D. Linker Error

37 What is Function Overloading?

A. Defining multiple functions with the same name but different parameters.
B. Defining a function in the base and derived class with the same signature.
C. Calling a function inside itself.
D. Passing too many parameters to a function.

38 In C++, the keyword friend allows a function to:

A. Access private and protected members of a class.
B. Inherit from the class.
C. Delete the class object.
D. Become a member of the class.

39 Which segment of memory stores global and static variables?

A. Stack
B. Heap
C. Data Segment
D. Code Segment

40 What is the outcome of void *p; in C++?

A. It declares a pointer that returns nothing.
B. It declares a generic pointer that can hold the address of any data type.
C. It is a syntax error.
D. It declares a null pointer.

41 Which of the following best describes an Abstract Class?

A. A class that has no variables.
B. A class that cannot be instantiated and is meant to be subclassed.
C. A class with only static methods.
D. A class that is hidden from other files.

42 In C++, what is the syntax to access a member of a class using a pointer to an object?

A. .
B.
C.
D.

43 What is RAII (Resource Acquisition Is Initialization) in C++?

A. A method to initialize arrays.
B. A programming idiom where resource management is tied to object lifetime.
C. A compiler optimization technique.
D. A way to pass parameters.

44 Which binding technique supports Method Overriding?

A. Static Binding
B. Dynamic Binding
C. Operator Binding
D. Type Binding

45 In Java, does System.gc() force Garbage Collection immediately?

A. Yes, always.
B. No, it only suggests to the JVM that garbage collection is required.
C. Yes, but only for the Stack.
D. No, it creates a new memory segment.

46 What is the result of int *p = (int*)malloc(sizeof(int)); if memory allocation fails?

A. Returns a dangling pointer.
B. Throws an exception.
C. Returns NULL.
D. Terminates the program immediately.

47 Which of the following is true about a Constructor?

A. It must have a return type of void.
B. It can be virtual.
C. It has the same name as the class and no return type.
D. It can be static.

48 How does passing a large object by value affect memory?

A. It saves memory.
B. It consumes more stack memory due to copying.
C. It allocates memory on the heap.
D. It has no effect on memory.

49 What is the primary role of the protected access specifier?

A. Accessible everywhere.
B. Accessible only within the class.
C. Accessible within the class and its derived classes.
D. Accessible only by friend functions.

50 Which pointer arithmetic operation is valid?

A. Adding two pointers.
B. Multiplying a pointer by a constant.
C. Subtracting two pointers of the same type.
D. Dividing a pointer by a constant.
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