Question 1

What is an attribute?

Accepted Answer

A characteristic or property of an object or data element.

Answer

A logical statement that evaluates to either true or false.

Answer

A group of instructions that are executed sequentially.

Answer

A function that performs a specific task.

Question 2

What is the purpose of a no-argument constructor ?

Accepted Answer

To create an object with default values.

Answer

To initialize all instance variables.

Answer

To access private methods.

Answer

To overload a method.

Question 3

Which of the following statements regarding no-argument constructors is true?

Accepted Answer

They have the same name as the class.

Answer

They are used to pass arguments to methods.

Answer

They are automatically inherited from a superclass.

Question 4

What is a constructor?

Accepted Answer

A special method that is used to initialize objects of a class.

Answer

A loop that repeats a block of code a fixed number of times.

Answer

A keyword used to define a data type in programming languages.

Answer

A variable that holds the memory address of an object.

Question 5

What is a parameterized constructor?

Accepted Answer

A constructor that accepts arguments to initialize object properties.

Answer

A constructor that creates multiple instances of a class.

Answer

A constructor that defines the behavior of an object when it is destroyed.

Answer

A constructor that sets default values for object properties.

Question 6

What is constructor overloading?

Accepted Answer

Having multiple constructors with different parameters in a class.

Answer

Defining constructors that can be accessed by any object in a program.

Answer

Creating constructors with the same name but different return types.

Answer

Having multiple constructors with identical signatures in a class.

Question 7

What does the 'this' keyword refer to?

Accepted Answer

The current object or instance

Answer

The next object in sequence

Answer

The previous object in sequence

Answer

A reserved word in programming

Question 8

What is the purpose of using super() in a subclass constructor?

Accepted Answer

To call the constructor of the parent class

Answer

To access private members of the parent class

Answer

To prevent the subclass from inheriting from the parent class

Answer

To override a method in the parent class

Answer

To create a new instance of the subclass

Question 9

Which keyword is used to create a subclass in Java?

Accepted Answer

extends

Answer

super

Answer

implements

Answer

inherits

Answer

sub

Question 10

What is the purpose of constructor overloading in object-oriented programming?

Accepted Answer

To provide multiple ways to initialize an object

Answer

To restrict access to class members

Answer

To hide the implementation details of a class

Answer

To create a hierarchy of classes

Answer

To enable dynamic binding of methods

Question 11

Which of the following is an example of a variable?

Accepted Answer

x = 5

Answer

function call

Answer

if statement

Answer

for loop

Question 12

What is the purpose of a variable?

Accepted Answer

To store and manipulate data

Answer

To perform calculations

Answer

To display output

Answer

To control program flow

Question 13

What is the purpose of initializing a variable?

Accepted Answer

To assign an initial value to a variable

Answer

To assign a random value to a variable

Answer

To declare a variable's data type

Answer

To create a new variable

Question 14

What is the scope of a variable?

Accepted Answer

The area of a program where the variable is accessible

Answer

The size of the variable in memory

Answer

The data type of the variable

Answer

The number of times the variable can be accessed

Question 15

What is the difference between local and global variables?

Accepted Answer

Local variables are declared within a specific function or block, while global variables are declared outside any function and can be accessed throughout the entire program.

Answer

Local variables have a shorter lifespan than global variables, which exist throughout the entire program.

Answer

Local variables are used for storing strings, while global variables are used for storing numbers.

Answer

Local variables are used for input, while global variables are used for output.

Question 16

What is the purpose of accessor methods?

Accepted Answer

To get the value of a private class member

Answer

To create a new object instance

Answer

To sort a list of elements

Answer

To print the contents of a file

Question 17

What is the return type of an accessor method?

Accepted Answer

The data type of the accessed class member

Answer

Void

Answer

Boolean

Answer

String

Question 18

Which of the following is true about accessor methods?

Accepted Answer

Accessor methods are typically public

Answer

Accessor methods can only return primitive data types

Answer

Accessor methods always have parameters

Answer

Accessor methods are typically private

Question 19

Which of the following is an example of an accessor method?

Accepted Answer

getAge()

Answer

setAge()

Answer

calculateAge()

Answer

printAge()

Question 20

What is the purpose of a mutator method?

Accepted Answer

To modify the value of a private class member

Answer

To create a new object instance

Answer

To sort a list of elements

Answer

To print the contents of a file

Question 21

What is the result of 8 % 3?

Accepted Answer

2

Answer

3

Answer

1

Answer

4

Question 22

What is the result of 10 % 4?

Accepted Answer

2

Answer

4

Answer

3

Answer

1

Question 23

Which of the following is a mutator method in computer science?

Accepted Answer

set()

Answer

get()

Answer

append()

Answer

print()

Question 24

What is the purpose of the `toString()` method in object-oriented programming?

Accepted Answer

To convert an object to its string representation.

Answer

To perform arithmetic operations on objects.

Answer

To create a new object from an existing one.

Answer

To access the properties of an object.

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