MCQ

Question 1

Which method of the List class is used to add an element to the end of the list?

Answer 1

The Add() method

Question 2

How do you create a list in C#?

Answer 2

List<datatype> listname = new List<datatype> () ;</datatype></datatype>

Question 2

What is the default value of a boolean in C#?

Answer 2

false

Question 3

Which keyword is used to define a method that must be overridden?

Answer 3

abstract

Question 4

What access modifier must abstract methods have?

Answer 4

public

Question 5

A method can only be abstract if?

Answer 5

Its class is abstract too

Question 6

When overriding a method what keyword must you use?

Answer 6

override

Question 7

What access modify must overridden functions have?

Answer 7

public

Question 8

How do you write nullable datatypes in C#?

Answer 8

datatype? varname;

Question 9

Which LINQ method is used to sort a collection in ascending order?

Answer 9

Order by

Question 10

What is the purpose of the finally block in exception handling?

Answer 10

To execute code regardless of whether an exception is thrown or not

Question 11

What is the return type of a constructor in C#?

Answer 11

Constructors have no return types

Question 12

How do you declare a multi-dimensional array in C#?

Answer 12

dataype [,] arrName = new datatype[rows, columns]

Question 13

What does the yield keyword do in C#?

Answer 13

Pauses code execution to return a value.

Question 14

What is the purpose of the using statement in C#?

Answer 14

Define a block with a scope for resource cleanup

Question 15

How do you declare a read-only property in a C# class?

Answer 15

By creating only a getter for that property without a setter.

Question 16

How do you define a data dictionary in c?

Answer 16

Dictionary<int, string> employees = new Dictionary<int, string>();