#1
Which keyword is used to declare a variable in JavaScript?
#2
What is the purpose of variable initialization?
To allocate memory for the variable
To assign an initial value to the variable
To declare the variable type
To determine the scope of the variable
#3
Which of the following is true about variable names in Java?
Variable names can start with a number
Variable names can contain spaces
Variable names are case-sensitive
Variable names can be a reserved keyword
#4
What is the default value of an uninitialized integer variable in Java?
#5
In JavaScript, what does the 'const' keyword do when declaring a variable?
Allows the variable to be reassigned
Specifies that the variable cannot be reassigned
Automatically assigns a value to the variable
Automatically deduces the data type of the variable
#6
What is the result of dividing by zero in most programming languages?
Returns zero
Returns infinity
Throws an error
Returns null
#7
In Python, what does the 'None' keyword represent when initializing a variable?
An empty string
An undefined value
A boolean False value
A null value
#8
What is the scope of a variable declared using the 'let' keyword in JavaScript?
Global scope
Function scope
Block scope
Local scope
#9
What does the 'extern' keyword signify in C programming language?
Declares a variable to be of external linkage
Declares a variable to be of internal linkage
Declares a variable to be a constant
Declares a variable to be static
#10
In Python, what is the result of trying to access a variable before it's been initialized?
SyntaxError
NameError
ValueError
TypeError
#11
In C#, how can you declare and initialize a variable in a single line?
var x = 10;
int x = 10;
x = 10;
let x = 10;
#12
What is the purpose of the 'static' keyword when declaring a variable in C++?
Allows the variable to be accessed only within the same class
Specifies that the variable cannot be modified
Specifies that the variable belongs to the class itself rather than instances of the class
Indicates that the variable's value may be changed unexpectedly
#13
In C++, what does the 'auto' keyword do when declaring a variable?
Declares a variable that cannot be modified
Specifies the data type of the variable
Automatically assigns a value to the variable
Automatically deduces the data type of the variable
#14
What is the purpose of the 'volatile' keyword in C++?
Indicates that a variable's value may be changed unexpectedly
Forces a variable to always be initialized
Specifies that a variable cannot be modified
Specifies that a variable cannot be accessed by multiple threads
#15
In Java, which of the following is an invalid variable name?
myVariable
123variable
_variable
$variable
#16
In C++, what does the 'mutable' keyword allow for a member variable?
Allows the variable to be accessed by multiple threads
Specifies that the variable cannot be modified
Allows the variable to be modified even in a const member function
Declares a variable that cannot be modified
#17
In Java, which access modifier is used to restrict access to variables within the same package?
public
private
protected
default