Tài liệu Questions to .NET and Programming in C# v2

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[TD]102.
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[TD=colspan: 13]If Parent is a base class and Child is its derived class then which of the following statements is not valid?
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[TD][1.0]
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[TD]
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[TD=colspan: 2]a)
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[TD=colspan: 4]Parent p1=new Child();
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[TD=colspan: 3]c)
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[TD=colspan: 4]Parent p1=new Parent();
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[TD]
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[TD=colspan: 2]b)
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[TD=colspan: 4]Child c1=new Child();
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[TD=colspan: 3]d)
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[TD=colspan: 4]Child c1=new Parent();
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[TD]103.
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[TD=colspan: 13]Any class that contain one or more abstract methods must be declared as ____
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[TD][1.0]
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[TD]
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[TD=colspan: 2]a)
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[TD=colspan: 4]Interface
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[TD=colspan: 3]c)
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[TD=colspan: 4]Static
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[TD]
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[TD=colspan: 2]b)
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[TD=colspan: 4]Abstract
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[TD=colspan: 3]d)
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[TD=colspan: 4]Private
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[TD]104.
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[TD=colspan: 13]Which of the following are correct statements for implementing an abstract class.
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[TD][1.0]
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[TD]
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[TD=colspan: 2]a)
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[TD=colspan: 4]public abstract void class ClassA
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[TD=colspan: 3]c)
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[TD=colspan: 4]abstract public ClassA
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[TD]
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[TD=colspan: 2]b)
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[TD=colspan: 4]public abstract class ClassA
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[TD=colspan: 3]
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[TD=colspan: 4]
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[TD=colspan: 2]105.
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[TD=colspan: 12]Which of the following methods can be called as an “operation”?
//'ClassA.methodA()' : virtual or abstract members cannot be private
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[TD][1.0]
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[TD=colspan: 2]
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[TD=colspan: 3]a)
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[TD=colspan: 4]public void methodA(){}
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[TD=colspan: 3]c)
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[TD=colspan: 2]void methodA();
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[TD=colspan: 2]
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[TD=colspan: 3]b)
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[TD=colspan: 4]public void methodA{}
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[TD=colspan: 3]d)
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[TD=colspan: 2]public void methodA();
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[TD]106.
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[TD=colspan: 13]Abstract methods holds only:
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[TD][1.0]
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[TD]
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[TD=colspan: 2]a)
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[TD=colspan: 4]return type
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[TD=colspan: 3]c)
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[TD=colspan: 4]name of method
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[TD]
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[TD]
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[TD=colspan: 2]b)
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[TD=colspan: 4]return statements
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[TD=colspan: 3]d)
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[TD=colspan: 4]Parameters
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[TD]107.
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[TD=colspan: 13]A __ can be thought as a mould of a class.
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[TD][1.0]
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[TD]
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[TD=colspan: 2]a)
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[TD=colspan: 4]abstract class
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[TD=colspan: 3]c)
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[TD=colspan: 4]Interface
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[TD]
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[TD=colspan: 2]b)
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[TD=colspan: 4]Delegates
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[TD=colspan: 3]d)
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[TD=colspan: 4]static class
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[TD]108.
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[TD=colspan: 13]Which of the following is a valid statement to implement class B in the class A.
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[TD][1.0]
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[TD]
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[TD=colspan: 2]a)
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[TD=colspan: 4]class A implements B
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[TD=colspan: 3]c)
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[TD=colspan: 4]class A:B
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[TD]
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[TD=colspan: 2]b)
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[TD=colspan: 4]class A implements class B
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[TD=colspan: 3]d)
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[TD=colspan: 4]class B:A
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[TD=colspan: 2]109.
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[TD=colspan: 12]Properties provide the opportunity to protect a field in a class by reading and writing to it using accessors.
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[TD][1.0]
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[TD=colspan: 2]
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[TD=colspan: 4]a)
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[TD=colspan: 2]True
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[TD=colspan: 5]b)
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[TD]False
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[TD]110.
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[TD=colspan: 13]