Data Types and Control Structures Quizzes - Object-Oriented Programming

Question 1

In Java, which of the following is NOT a primitive data type?

Accepted Answer

String

Answer

int

Answer

boolean

Answer

double

Question 2

In Java, which of the following is a non-primitive data type?

Accepted Answer

String

Answer

int

Answer

float

Answer

char

Question 3

In Java, which of the following is true about data types?

Accepted Answer

Both primitive and non-primitive data types exist, and they are type-safe.

Answer

Only primitive data types exist.

Answer

Only non-primitive data types exist.

Answer

Data types in Java are not type-safe.

Question 4

In Java, which of these is NOT a primitive data type?

Accepted Answer

String

Answer

int

Answer

char

Answer

float

Question 5

Which of the following is a non-primitive data type in Java?

Accepted Answer

String

Answer

int

Answer

float

Answer

boolean

Question 6

In Java, which of the following is NOT a primitive data type?

Accepted Answer

String

Answer

int

Answer

double

Answer

boolean

Question 7

In Java, which of these is NOT a primitive data type?

Accepted Answer

String

Answer

int

Answer

boolean

Answer

double

Question 8

In Java, what's the range of values that can be stored in the primitive data type byte?

Accepted Answer

-128 to 127

Answer

-256 to 255

Answer

0 to 255

Answer

-32768 to 32767

Question 9

In Java, which data type is used to store a single character?

Accepted Answer

char

Answer

int

Answer

float

Answer

boolean

Question 10

In Java, which of these is a non-primitive data type?

Accepted Answer

String

Answer

int

Answer

boolean

Answer

double

Question 11

In Java, which of the following is NOT a primitive data type?

Accepted Answer

String

Answer

int

Answer

float

Answer

boolean

Question 12

In Java, which of the following is a non-primitive data type?

Accepted Answer

String

Answer

int

Answer

double

Answer

char

Question 13

In Java, which of the following is NOT a primitive data type?

Accepted Answer

Object

Answer

int

Answer

boolean

Answer

float

Question 14

Which of the following is NOT a primitive data type in Java?

Accepted Answer

String

Answer

Integer (int)

Answer

Float (float)

Answer

Boolean (boolean)

Question 15

Which of the following is NOT a primitive data type in Java?

Accepted Answer

String

Answer

int

Answer

double

Answer

boolean

Question 16

In Java, which of the following is a non-primitive data type?

Accepted Answer

String

Answer

Integer

Answer

Character

Answer

Boolean

Question 17

Which of the following is a non-primitive data type in Java?

Accepted Answer

String

Answer

int

Answer

double

Answer

boolean

Question 18

Which data type can store numbers with decimal points, both positive and negative?

Accepted Answer

Float

Answer

Integer

Answer

Boolean

Question 19

Which of the following is NOT a primitive data type in Java?

Accepted Answer

String

Answer

int

Answer

boolean

Answer

double

Question 20

In a conditional statement, what element determines whether the code block will run?

Accepted Answer

Condition

Answer

Assignment

Answer

Loop

Answer

Function call

Question 21

In object-oriented programming, arrays offer a key advantage over individual variables. Which of the following best describes this advantage?

Accepted Answer

Arrays provide an organized and efficient way to manage large amounts of data.

Answer

Arrays allow for the storage of different data types within a single structure.

Answer

Arrays can dynamically adjust their size based on data needs.

Answer

Arrays are exclusively used for storing primitive data types, ensuring data integrity.

Question 22

In object-oriented programming, which characteristic defines objects?

Accepted Answer

Objects encapsulate data and methods, representing real-world entities.

Answer

Objects can only be passed by reference.

Answer

Objects are isolated and cannot interact.

Answer

Objects are always mutable and can be modified.

Question 23

In Java, which data type is non-primitive and can store a sequence of characters?

Accepted Answer

String

Answer

int

Answer

float

Answer

byte

Question 24

In Java, how do you establish a key-value pair within a Map data structure?

Accepted Answer

put(key, value)

Answer

get(key)

Answer

remove(key)

Answer

contains(key)

Question 25

In Java, which of the following is NOT a primitive data type?

Accepted Answer

String

Answer

int

Question 26

In Java, which of the following is a non-primitive data type?

Accepted Answer

String

Answer

int

Answer

float

Answer

boolean

Question 27

Which of the following is NOT a primitive data type in Java?

Accepted Answer

String

Answer

Integer

Answer

Double

Answer

Boolean

Question 28

Which of the following statements accurately describes the data types that can be evaluated by a switch statement in Java?

Accepted Answer

The switch statement can evaluate byte, short, char, and int variables.

Answer

The switch statement can evaluate any data type.

Answer

The switch statement can evaluate float, double, and boolean variables.

Answer

The switch statement can evaluate String objects.

Question 29

In Java, a constant variable is characterized by:

Accepted Answer

Unchangeable value after initialization

Answer

Automatic zero initialization

Answer

Declaration without data type

Answer

Exclusive storage of program name

Question 30

In Java, which data type is NOT a primitive type?

Accepted Answer

String

Answer

int

Answer

boolean

Answer

double

Question 31

In Java, an 'if' statement will not execute its associated code block when:

Accepted Answer

The condition evaluates to false.

Answer

The condition evaluates to true.

Answer

There is no 'else' block.

Question 32

Which of the following is NOT a primitive data type in Java?

Accepted Answer

String

Answer

int

Answer

boolean

Answer

char

Question 33

Which Java relational operator checks for inequality between two numbers?

Accepted Answer

!=

Answer

==

Answer

<

Answer

>

Question 34

In Java, which statement about constants is correct?

Accepted Answer

Constants must be declared using the 'final' keyword and cannot be modified.

Answer

Constants cannot be used in Java.

Answer

Constants must be declared using the 'const' keyword.

Answer

Constants can be modified during program execution.

Question 35

In object-oriented programming, what's the primary purpose of abstraction?

Accepted Answer

Simplifying complex systems by hiding intricate implementation details and presenting only relevant features and functionalities to the user.

Answer

Increasing code complexity by adding unnecessary layers of encapsulation and indirection.

Question 36

In Java, which data type represents a sequence of characters and is not a primitive type?

Accepted Answer

String

Answer

int

Answer

boolean

Question 37

In Java, what is the purpose of the '&&' operator when used with two boolean expressions?

Accepted Answer

Determining if both boolean expressions are true.

Answer

Combining two strings together.

Answer

Checking if one boolean expression is true or false.

Answer

Calculating the average of two numbers.

Question 38

In Java, which data type is NOT primitive?

Accepted Answer

String

Answer

int

Answer

float

Answer

char

Question 39

In object-oriented programming, what's the main purpose of classes?

Accepted Answer

Classes provide a structure for handling and representing data.

Answer

Classes control the order in which a program runs.

Answer

Classes define how users interact with a program.

Answer

Classes help create and manage threads for concurrent programming.

Question 40

In Java, which of the following is a non-primitive data type?

Accepted Answer

String

Answer

int

Answer

char

Answer

boolean

Question 41

In Java, which of these is a non-primitive data type?

Accepted Answer

String

Answer

int

Answer

double

Answer

boolean

Question 42

In Java, which of the following is a non-primitive data type?

Accepted Answer

String

Answer

int

Answer

float

Answer

boolean

Question 43

In object-oriented programming, encapsulation is used to protect data. How does encapsulation achieve this?

Accepted Answer

Encapsulation hides data and methods from external access, protecting data privacy and preventing unauthorized modifications.

Answer

Encapsulation bundles data and methods into objects, providing an organized structure for managing object data.

Answer

Encapsulation facilitates code reusability by allowing data and methods to be shared across objects.

Answer

Encapsulation simplifies object creation by automating the initialization of data members.

Question 44

In object-oriented programming, what is a defining characteristic of objects?

Accepted Answer

They combine data and behavior into self-contained units.

Answer

They are declared globally for easy access.

Answer

They cannot be modified once created.

Answer

They are not used in object-oriented programming.

Question 45

Which of the following is NOT a primitive data type in Java?

Accepted Answer

String

Answer

int

Answer

char

Answer

boolean

Question 46

In Python, which loop construct is ideal for iterating through the key-value pairs of a dictionary?

Accepted Answer

for loop with .items() method (for key, value in my_dict.items())

Answer

while loop with .keys() method (while key in my_dict.keys())

Answer

foreach loop (foreach key, value: my_dict)

Question 47

Which of the following is NOT a primitive data type in Java?

Accepted Answer

HashMap

Answer

int

Answer

boolean

Answer

char

Question 48

In Java, what is the primary purpose of access modifiers?

Accepted Answer

Control the visibility of class members to prevent unauthorized access and modifications.

Answer

Specify only public class members.

Answer

Have no effect on data visibility.

Question 49

In Java, what is the primary purpose of a constructor, and how does it contribute to initializing an object's state?

Accepted Answer

A constructor is called when an object is created, allowing you to set initial values for its instance variables, initializing the object's state.

Answer

A constructor is a special method used to end a Java program when an error occurs during object creation.

Answer

A constructor is a static method used to create new objects of a class.

Answer

A constructor is a keyword used to declare variables within a Java class.

Question 50

In the Java code below, what type of conversion occurs when assigning the value of 'x' to 'y'?:
```
int x = 10;
float y = x;
```

Accepted Answer

Widening conversion (Implicit)

Answer

Narrowing conversion (Explicit)

Answer

No conversion occurs

Question 51

What is the result of the Java boolean expression: `false && !true`?

Accepted Answer

false

Answer

true

Answer

null

Question 52

Which of the following is NOT a primitive data type in Java?

Accepted Answer

String

Answer

int

Answer

float

Answer

boolean

Question 53

Which of the following Java data types represents a whole number?

Accepted Answer

int

Answer

String

Answer

boolean

Answer

double

Question 54

What is the purpose of an `if-else` statement in Java?

Accepted Answer

To execute code based on one or more conditions

Answer

To iterate over a collection

Answer

To handle exceptions

Answer

To create a loop

Question 55

Which of the following is a logical operator in Java?

Accepted Answer

&&

Answer

==

Answer

>=

Answer

?

Question 56

What is the key difference between a `while` loop and a `do-while` loop?

Accepted Answer

A `do-while` loop always executes its body at least once

Answer

A `while` loop checks its condition after executing its body

Answer

There is no difference between `while` and `do-while` loops

Answer

A `do-while` loop is faster than a `while` loop

Question 57

What is the role of the `break` statement in a Java `switch` statement?

Accepted Answer

To terminate execution of the `switch` statement

Answer

To skip to the next case label

Answer

To modify the value of the `switch` expression

Answer

To throw an exception

Question 58

Which control structure is used to repeatedly execute a block of code until a condition becomes false?

Accepted Answer

while

Answer

if-else

Answer

switch-case

Answer

for

Question 59

Evaluate the pros and cons of using primitive and non-primitive data types in Java, explaining their key characteristics and limitations.

Accepted Answer

Primitive data types have a fixed memory allocation, while non-primitive data types have a dynamic memory allocation.

Accepted Answer

Non-primitive data types are objects, whereas primitive data types are not.

Answer

Non-primitive data types are inherently more efficient than primitive data types.

Answer

Primitive data types can only store single values, while non-primitive data types can store multiple values.

Question 60

In Java, which access modifier restricts data access to only the class where it's defined?

Accepted Answer

private

Answer

public

Answer

protected

Question 61

Which of the following data types is used to store whole numbers in Java?

Accepted Answer

int

Answer

float

Answer

char

Answer

double

Question 62

What is the purpose of the 'if-else' statement?

Accepted Answer

To execute one block of code if a condition is true and another block of code if the condition is false

Answer

To execute a block of code if a condition is true

Answer

To execute a block of code if a condition is false

Answer

To terminate the program if a condition is true

Question 63

What is the difference between a variable and a constant?

Accepted Answer

A variable can be modified, while a constant cannot

Answer

A constant can be modified, while a variable cannot

Answer

There is no difference between a variable and a constant

Answer

Both a variable and a constant can be modified

Question 64

Which statement is used to unconditionally exit a loop?

Accepted Answer

break

Answer

continue

Answer

return

Answer

exit