C# 4.0 MCQs(Multiple Choice Questions)

After Basic set of asp.net MCQs lets try for some advance topics.

1.The infrastructure that supports these dynamic operations at run time is called the__________.
A.CLR
B.CTS
C.CLS
D.DLR
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D. DLR(Dynamic Language Runtime).

2.The___________keyword is new to C# 4.0, and is used to tell the compiler that a variable's type can change or that it is not known until runtime.
A.Covariance
B.dynamic
C.Contravariance
D.Object
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B.dynamic

3.___________methods are not supported for dynamic types.
A.Anonymous
B.Static
C.Abstract
D.Extension
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D.Extension

4.myMobile.Accept(55, inReject: false); Above statement is an example of which new concept of C# 4.0?
A.Named Parameters
B.Optional Parameters
C.dynamic
D.Variance
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A.Named Parameters

5.COM Interop is simplified in C#4.0 e.g.var doc = Application.GetDocument("MyFile.txt"); In above statement_______ keyword was essential in parameters of GetDocument() in previous versions of C#.
A.out
B.named
C.base
D.ref
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D.ref

6.Covariance and Contravariance are new features introduced in C# 4.0.True/False?
A.False
B.True
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B.True

7._________parameters allows you to give a method parameter a default value so that you do not have to specify it every time you call the method.
A.optional
B.named
C.out
D.ref
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A.optional

8.Duck typing is implemented by using_________ keyword.
A.dynamic
B.object
C.ref
D.base
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A.dynamic