C# Delegates Questions with Answers | Programming Interview MCQ | Page 2

Delegates in C# are powerful constructs that allow methods to be passed as parameters, forming the foundation for event handling and lambda expressions. This section contains C# programming questions and answers focusing on delegate declaration, invocation, and multicast behavior. These C# delegates questions with answers are commonly asked in Infosys, TCS, and Capgemini technical interviews. Understanding delegates enhances your grasp of advanced C# features like events and asynchronous programming, which are key to writing flexible, maintainable applications.

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Q11

Suppose a Generic class called SortObjects is to be made capable of sorting objects of any type (Integer, Single, Byte etc.). Which of the following programming constructs should be used to implement the comparision function?

A Namespace
B Interface
C Encapsulation
D Delegate

Answer: Option D

Q12

With which of the following can the ref keyword be used?     Static data     Instance data     Static function/subroutine     Instance function/subroutine

A 1, 2
B 3, 4
C 1, 3
D 2, 4

Answer: Option B

Q13

What is a delegate in C#?

A A class that contains only static methods
B A type-safe function pointer
C A special type of array
D A database connection object

Answer: Option B

Explanation: A delegate is a type-safe function pointer that defines a method signature.

Q14

Which keyword is used to define a delegate in C#?

A function
B delegate
C method
D pointer

Answer: Option B

Explanation: The delegate keyword is used to define a delegate type in C#.

Q15

What is the base class for all delegates in C#?

A System.Delegate
B System.MulticastDelegate
C System.Object
D System.ValueType

Answer: Option B

Explanation: System.MulticastDelegate is the base class for all delegate types in C#.

Q16

Which of the following is true about delegates?

A They are not type-safe
B They can point to only one method at a time
C They are type-safe and can point to multiple methods
D They cannot be used with events

Answer: Option C

Explanation: Delegates are type-safe and can point to multiple methods.

Q17

What is multicast delegate in C#?

A A delegate that can call methods on multiple objects
B A delegate that can hold references to multiple methods
C A delegate that works with multiple threads
D A delegate that can handle multiple exceptions

Answer: Option B

Explanation: A delegate that can hold references to multiple methods and invoke them in sequence.

Q18

How do you combine multiple delegates into one?

A Using the Combine() method
B Using the + operator
C Using the Merge() method
D Using the & operator

Answer: Option B

Explanation: The + operator is used to combine delegates in C#.

Q19

What happens when a multicast delegate is invoked?

A Only the first method is called
B Methods are called in reverse order
C All methods are called in the order they were added
D A random method is selected and called

Answer: Option C

Explanation: All methods referenced by the delegate are called in the order they were added.

Q20

Which of these is NOT a built-in delegate in C#?

A Action
B Func
C FuncDelegate
D Predicate

Answer: Option C

Explanation: FuncDelegate is not a built-in delegate type in C#.

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