Which of the following is a valid identifier in C#?

• 1number

• firstName

• class

• new

What keyword is used to declare a constant in C#?

• var

• static

• const

• final

Which of the following is a C# keyword?

• score

• data

• length

• public

Which of these cannot be used as an identifier unless prefixed with @?

• PI

• class

• Temp_1

• dataType

What happens if you try to assign a new value to a constant?

• The value changes

• A compilation error occurs

• The value is updated at runtime

• Nothing happens

Which data type stores a single Unicode character?

• string

• bool

• int

• char

What is the correct syntax to declare a variable of type int with a value of 25?

• int age = 25;

• int = 25 age;

• 25 = int age;

• int age(25);

Which of the following is a value type in C#?

• array

• int

• class

• string

Which of the following data types is a reference type?

• int

• float

• string

• char

Where are value types stored in memory?

• Stack

• Heap

• Cache

• Register