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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
- 1. Which of the following statements are correct about a namespace used in C#.NET?
- Classes must belong to a namespace, whereas structures need not.
- Every class, struct, enum, delegate and interlace has to belong to some or the other namespace.
- All elements of the namespace have to belong to one file.
- If not mentioned, a namespace takes the name of the current project.
- 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?
using System.Windows.Forms; ListBox lb = new ListBox();
using LBControl = System.Windows.Forms; LBControl lb = new LBControl();
System.Windows.Forms.ListBox lb = new System.Windows.Forms.ListBox();
using LBControl lb = new System.Windows.Forms.ListBox;
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?
- All operators in C#.NET can be overloaded.
- We can use the new modifier to modify a nested type if the nested type is hiding another type.
- In case of operator overloading all parameters must be of the different type than the class or struct that declares the operator.
- Method overloading is used to create several methods with the same name that performs similar tasks on similar data types.
- 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?
- true
- false
- +
- new
- 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
Polymorphism problems
Search Results
Correct Answer: 2, 4, 5
Correct Answer: Nested namespaces are allowed.
Correct Answer: Add Reference of the namespace.
Import the namespace.
Use the elements of the namespace.
Correct Answer: System.Process
Correct Answer: 1, 3, 5
Correct Answer: virtual
Correct Answer: 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.
Correct Answer: 2, 5
Correct Answer: 1, 2, 3
Correct Answer: sealed
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