Ultimate C Sharp Test - 79+ MCQs: C# test: Evaluate Your Skills with C# Questions and Answers

1. What is 'garbage collection' in C#?

A process for removing unused namespaces from code.

A method for compressing data in memory to save space.

An automatic memory management technique for reclaiming unused objects and freeing up memory.

A way to optimize database queries in C#.

2. What is the purpose of the 'break' statement in a switch statement in C#?

To exit the switch statement

To continue to the next case

To skip the current case

To return a value

3. What is the purpose of the 'is' keyword in C#?

To perform arithmetic operations

To check the type of an object

To define a new variable

To create an array

4. What is the primary benefit of using the 'async' and 'await' keywords in C#?

They improve code readability.

They allow code to run faster.

They simplify handling asynchronous operations and avoid blocking the main thread.

They enable multi-threading in C# applications.

5. What is the difference between 'ref' and 'out' parameters in C#?

'ref' parameters are passed by reference and must be initialized before being passed to a method, while 'out' parameters are also passed by reference but can be uninitialized.

'ref' parameters are passed by value and must be initialized before being passed to a method, while 'out' parameters are passed by reference.

'ref' parameters are used for value types, while 'out' parameters are used for reference types.

There is no difference between 'ref' and 'out' parameters in C#.

6. What is the purpose of the 'this' keyword in C#?

To create a new instance of a class

To reference the current instance of a class

To declare a constant

To define a new variable

7. In C#, what is the purpose of the 'StringBuilder' class?

To define variables

To build strings efficiently

To create loops

To perform mathematical operations

8. What is 'nullable types' in C#?

Types that cannot be assigned a value.

Types that are automatically initialized to null.

Types that can represent both a value and a lack of a value (null).

Types that have fixed size and cannot be resized.

9. What is 'generics' in C#?

A way to define classes with generic parameters.

A technique for optimizing memory usage in C#.

A method for overriding base class methods.

A way to define custom attributes.

10. What is the C# syntax for a for loop?

for (int i = 0; i < 10; i++) { }

foreach (int i in myArray) { }

while (i < 10) { }

do { } while (i < 10);

C# MCQ Test 5