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  • Question
  • Which of the following modifier is used when a virtual method is redefined by a derived class?


  • Options
  • A. overloads
  • B. override
  • C. overridable
  • D. virtual
  • E. base

  • Correct Answer
  • override 


  • Polymorphism problems


    Search Results


    • 1. Which of the following statements are correct about a namespace used in C#.NET?

      1. Classes must belong to a namespace, whereas structures need not.
      2. Every class, struct, enum, delegate and interlace has to belong to some or the other namespace.
      3. All elements of the namespace have to belong to one file.
      4. If not mentioned, a namespace takes the name of the current project.
      5. The namespace should be imported to be able to use the elements in it.

    • Options
    • A. 1, 3
    • B. 2, 4, 5
    • C. 3, 5
    • D. 4 only
    • Discuss
    • 2. Which of the following statements is correct about a namespace used in C#.NET?

    • Options
    • A. Nested namespaces are not allowed.
    • B. Importing outer namespace imports inner namespace.
    • C. Nested namespaces are allowed.
    • D. If nested, the namespaces cannot be split across files.
    • Discuss
    • 3. If a namespace is present in a library then which of the following is the correct way to use the elements of the namespace?

    • Options
    • A. Add Reference of the namespace.
      Use the elements of the namespace.
    • B. Add Reference of the namespace.
      Import the namespace.
      Use the elements of the namespace.
    • C. Import the namespace.
      Use the elements of the namespace.
    • D. Copy the library in the same directory as the project that is trying to use it.
      Use the elements of the namespace.
    • E. Install the namespace in Global Assembly Cache.
      Use the elements of the namespace.
    • Discuss
    • 4. Which of the following is NOT a namespace in the .NET Framework Class Library?

    • Options
    • A. System.Process
    • B. System.Security
    • C. System.Threading
    • D. System.Drawing
    • E. System.Xml
    • Discuss
    • 5. If ListBox is class present in System.Windows.Forms namespace, then which of the following statements are the correct way to create an object of ListBox Class?

      1. using System.Windows.Forms; 
        ListBox lb = new ListBox();
      2. using LBControl = System.Windows.Forms;
        LBControl lb = new LBControl();
      3. System.Windows.Forms.ListBox lb = new System.Windows.Forms.ListBox();
      4. using LBControl lb = new System.Windows.Forms.ListBox;
      5. using LBControl = System.Windows.Forms.ListBox; 
        LBControl lb = new LBControl();

    • Options
    • A. 1, 3
    • B. 2, 4, 5
    • C. 1, 3, 5
    • D. 5 only
    • Discuss
    • 6. In order for an instance of a derived class to completely take over a class member from a base class, the base class has to declare that member as

    • Options
    • A. new
    • B. base
    • C. virtual
    • D. overrides
    • E. overloads
    • Discuss
    • 7. Which of the following statements is correct?

    • Options
    • A. Static methods can be a virtual method.
    • B. Abstract methods can be a virtual method.
    • C. It is necessary to override a virtual method.
    • D. When overriding a method, the names and type signatures of the override method must be the same as the virtual method that is being overriden.
    • E. We can override virtual as well as non-virtual methods.
    • Discuss
    • 8. Which of the following statements are correct?

      1. All operators in C#.NET can be overloaded.
      2. We can use the new modifier to modify a nested type if the nested type is hiding another type.
      3. In case of operator overloading all parameters must be of the different type than the class or struct that declares the operator.
      4. Method overloading is used to create several methods with the same name that performs similar tasks on similar data types.
      5. Operator overloading permits the use of symbols to represent computations for a type.

    • Options
    • A. 1, 3
    • B. 2, 4
    • C. 2, 5
    • D. 3, 4
    • Discuss
    • 9. Which of the following unary operators can be overloaded?

      1. true
      2. false
      3. +
      4. new
      5. is

    • Options
    • A. 1, 2, 3
    • B. 3, 4, 5
    • C. 3 only
    • D. 5 only
    • Discuss
    • 10. A derived class can stop virtual inheritance by declaring an override as

    • Options
    • A. inherits
    • B. extends
    • C. inheritable
    • D. not inheritable
    • E. sealed
    • Discuss


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