Nebula: Pre-test

What is the primary purpose of variables in programming?

• To store and manipulate data 

• To execute control flow statements

• To define functions

• To create graphical user interfaces

In programming, which of the following statements is used to execute a block of code repeatedly as long as a specified condition is true?

• if statement

• for loop

• switch statement

• break statement

Consider the following code snippet in a programming language:

x = 5

y = 3

result = x++ - --y + x-- * y++

What is the final value of the variable result after executing this code?

• 25

• 16

• 23

• 20

In programming languages that support pointers, what does the "dereference" operation do?

• Access the memory address of a variable

• Create a new variable in memory

• Access the value stored at a memory address

• Increment the value of a variable

How are elements typically accessed in an array in most programming languages?

• By using the "element" keyword

• By specifying the position with an index

• By using the "access" function

• By using a loop

Which data type is used to represent true or false values in programming?

• Integer

• Float

• String

• Boolean

In object-oriented programming, what is a class?

• A specific instance of an object

• A collection of functions

• A blueprint for creating objects

• A variable with a predefined value

In the context of object-oriented programming, what is the significance of the term "polymorphism"?

• It refers to the ability of an object to take on multiple forms based on its attributes

• It represents the process of converting a class into an object

• It describes the concept of encapsulation within a class hierarchy

• It denotes the process of dynamically allocating memory for objects during runtime

What is the correct first step in solving the equation 2x + 5 = 11 for x?

• Subtract 5 from both sides

• Add 5 to both sides

• Divide both sides by 2

• Multiply both sides by 5

Evaluate the expression 3(4 + 2) - 7

• 13

• 15

• 11

• 19