Generics in C# Programming Questions with Answers | C# MCQ | Page 3

Generics in C# programming questions with answers test your knowledge of type safety, reusability, and performance in modern C# development. Understanding generics is crucial for building flexible and maintainable code, especially for technical interviews and placement tests at companies like Capgemini, Accenture, and Cognizant. These programming questions and answers cover key topics like generic classes, methods, constraints, and collections. Practicing these MCQs enhances your ability to write type-safe and efficient code, a skill highly valued in software engineering roles. Try solving C# generics MCQs online or download C# programming practice PDFs for self-assessment.

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Q21

What is type erasure in context of C# generics?

A C# removes type information at runtime
B C# maintains type information at runtime
C Type information is stored in metadata only
D Types are converted to object references

Answer: Option B

Explanation: C# generics are reified and maintain type information at runtime, unlike Java.

Q22

Which collection is generic in C#?

A ArrayList
B Hashtable
C List<T>
D Queue

Answer: Option C

Explanation: List<T> is a generic collection, while others are non-generic.

Q23

What does covariance allow in generics?

A Using less derived types
B Using more derived types
C Using any type
D Using only value types

Answer: Option B

Explanation: Covariance enables using a more derived type than originally specified.

Q24

Which interface supports covariance in C#?

A IList<T>
B ICollection<T>
C IEnumerable<T>
D IDictionary<T>

Answer: Option C

Explanation: IEnumerable<T> is covariant, allowing assignment compatibility.

Q25

What is the purpose of the "in" keyword in generic interfaces?

A Makes parameter covariant
B Makes parameter contravariant
C Restricts to input parameters
D Allows output parameters only

Answer: Option B

Explanation: The "in" keyword makes a generic parameter contravariant.

Q26

Which constraint would you use for value types?

A where T : class
B where T : struct
C where T : value
D where T : valuetype

Answer: Option B

Explanation: The "struct" constraint restricts to value types only.

Q27

What happens if you don't specify constraints on a generic type?

A All operations are available
B Only System.Object operations are available
C The type cannot be used
D Runtime type checking is enforced

Answer: Option B

Explanation: Without constraints, only operations valid for System.Object are available.

Q28

How do you create a generic method?

A void Method<T> { }
B void Method(T param) { }
C void <T>Method() { }
D void Method()<T> { }

Answer: Option A

Explanation: Generic methods have type parameters declared after the method name.

Q29

Which of these is a benefit of generics?

A Reduced code readability
B Eliminates boxing and unboxing
C Increased memory usage
D Dynamic type checking

Answer: Option B

Explanation: Generics provide type safety and eliminate boxing/unboxing for value types.

Q30

What does the "out" keyword do in generic interfaces?

A Makes parameter input-only
B Makes parameter output-only
C Makes parameter covariant
D Makes parameter contravariant

Answer: Option C

Explanation: The "out" keyword makes a generic parameter covariant.

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