Đề thi trắc nghiệm môn C sharp (6)

Câu hỏi trắc nghiệm C# bằng tiếng anh có đáp án

51

C.
Sample class
D.
Bix1 method Sample class
E.
Sample class Sample class


17. Which of the following statements is correct about constructors in C#.NET?
A.
A constructor cannot be declared as private.
B.
A constructor cannot be overloaded.
C.
A constructor can be a static constructor.
D.
A constructor cannot access static data.
E.
this reference is never passed to a constructor.


18. What will be the output of the C#.NET code snippet given below?
namespace IndiabixConsoleApplication
{
class Sample
{
public static void fun1()

{
Console.WriteLine("Bix1 method");
}
public void fun2()
{
fun1();
Console.WriteLine("Bix2 method");
}
public void fun2(int i)
{
Console.WriteLine(i);
fun2();
}
}
class MyProgram
{
static void Main(string[ ] args)
{
Sample s = new Sample();
Sample.fun1();
s.fun2(123);
}
}
}
Câu hỏi trắc nghiệm C# bằng tiếng anh có đáp án

52

A.
Bix1 method

123
Bixl method
Bix2 method
B.
Bix1 method
123
Bix2 method
C.
Bix2 method
123
Bix2 method
Bixl method
D.
Bixl method
123
E.
Bix2 method
123
Bixl method

Câu hỏi Inheritance (thừa kế)

1. Which of the following can be facilitated by the Inheritance mechanism?
1. Use the existing functionality of base class.
2. Overrride the existing functionality of base class.
3. Implement new functionality in the derived class.
4. Implement polymorphic behaviour.
5. Implement containership.
A.
1, 2, 3

B.
3, 4
C.
2, 4, 5
D.
3, 5

2. Which of the following statements should be added to the subroutine fun( ) if the
C#.NET code snippet given below is to output 9 13?
class BaseClass
{
protected int i = 13;
}
class Derived: BaseClass
{
int i = 9;
public void fun()
Câu hỏi trắc nghiệm C# bằng tiếng anh có đáp án

53

{
// [*** Add statement here ***]
}
}
A.
Console.WriteLine(base.i + " " + i);
B.
Console.WriteLine(i + " " + base.i);
C.

Console.WriteLine(mybase.i + " " + i);
D.
Console.WriteLine(i + " " + mybase.i);
E.
Console.WriteLine(i + " " + this.i);

3. Which of the following statements are correct about the C#.NET code snippet given
below?
namespace IndiabixConsoleApplication
{
class index
{
protected int count;
public index()
{
count = 0;
}
}
class index1: index
{
public void increment()
{
count = count +1;
}
}
class MyProgram
{
static void Main(string[] args)
{
index1 i = new index1();

i.increment();
}
}
}
1. count should be declared as public if it is to become available in the inheritance chain.
2. count should be declared as protected if it is to become available in the inheritance chain.
3. While constructing an object referred to by i firstly constructor of index class will be called
followed by constructor of index1 class.
4. Constructor of index class does not get inherited in index1 class.
Câu hỏi trắc nghiệm C# bằng tiếng anh có đáp án

54

5. count should be declared as Friend if it is to become available in the inheritance chain.
A.
1, 2, 5
B.
2, 3, 4
C.
3, 5
D.
4, 5
E.
None of these



4. What will be the size of the object created by the following C#.NET code snippet?
namespace IndiabixConsoleApplication
{

class Baseclass
{
private int i;
protected int j;
public int k;
}
class Derived: Baseclass
{
private int x;
protected int y;
public int z;
}
class MyProgram
{
static void Main (string[ ] args)
{
Derived d = new Derived();
}
}
}
A.
24 bytes
B.
12 bytes
C.
20 bytes
D.
10 bytes
E.
16 bytes

Câu hỏi trắc nghiệm C# bằng tiếng anh có đáp án

55

5. Which statement will you add in the function fun() of class B, if it is to produce the
output "Welcome to IndiaBIX.com!"?
namespace IndiabixConsoleApplication
{
class A
{
public void fun()
{
Console.Write("Welcome");
}
}
class B: A
{
public void fun()
{
// [*** Add statement here ***]
Console.WriteLine(" to IndiaBIX.com!");
}
}
class MyProgram
{
static void Main (string[ ] args)
{
B b = new B();
b.fun();

}
}
}
A.
base.fun();
B.
A::fun();
C.
fun();
D.
mybase.fun();
E.
A.fun();

6. What will be the output of the C#.NET code snippet given below?
namespace IndiabixConsoleApplication
{
class Baseclass
{
public void fun()
{
Console.Write("Base class" + " ");
}
Câu hỏi trắc nghiệm C# bằng tiếng anh có đáp án

56

}
class Derived1: Baseclass
{

new void fun()
{
Console.Write("Derived1 class" + " ");
}
}
class Derived2: Derived1
{
new void fun()
{
Console.Write("Derived2 class" + " ");
}
}
class Program
{
public static void Main(string[ ] args)
{
Derived2 d = new Derived2();
d.fun();
}
}
}
A.
Base class
B.
Derived1 class
C.
Derived2 class
D.
Base class Derived1 class
E.

Base class Derived1 class Derived2 class

7. Which of the following should be used to implement a 'Has a' relationship between two
entities?
A.
Polymorphism
B.
Templates
C.
Containership
D.
Encapsulation
E.
Inheritance



8. Which of the following is correct about the C#.NET snippet given below?
namespace IndiabixConsoleApplication
{
class Baseclass
{
public void fun()
Câu hỏi trắc nghiệm C# bằng tiếng anh có đáp án

57

{
Console.WriteLine("Hi" + " ");
}

public void fun(int i)
{
Console.Write("Hello" + " ");
}
}
class Derived: Baseclass
{
public void fun()
{
Console.Write("Bye" + " ");
}
}
class MyProgram
{
static void Main(string[ ] args)
{
Derived d;
d = new Derived();
d.fun();
d.fun(77);
}
}
}
A.
The program gives the output as: Hi Hello Bye
B.
The program gives the output as: Bye Hello
C.
The program gives the output as: Hi Bye Hello
D.

Error in the program

9. In an inheritance chain which of the following members of base class are accessible to
the derived class members?
1. static
2. protected
3. private
4. shared
5. public
A.
1, 3
B.
2, 5
C.
3, 4
D.
4, 5

Câu hỏi trắc nghiệm C# bằng tiếng anh có đáp án

58

10. Which of the following are reuse mechanisms available in C#.NET?
1. Inheritance
2. Encapsulation
3. Templates
4. Containership
5. Polymorphism
A.
1, 4

B.
1, 3
C.
2, 4
D.
3, 5



11. Which of the following should be used to implement a 'Like a' or a 'Kind of' relationship
between two entities?
A.
Polymorphism
B.
Containership
C.
Templates
D.
Encapsulation
E.
Inheritance




12. How can you prevent inheritance from a class in C#.NET ?
A.
Declare the class as shadows.
B.
Declare the class as overloads.

C.
Declare the class as sealed.
D.
Declare the class as suppress.
E.
Declare the class as override.


13. Which of the following statements are correct about Inheritance in C#.NET?
1. A derived class object contains all the base class data.
2. Inheritance cannot suppress the base class functionality.
3. A derived class may not be able to access all the base class data.
4. Inheritance cannot extend the base class functionality.
5. In inheritance chain construction of object happens from base towards derived.
A.
1, 2, 4
Câu hỏi trắc nghiệm C# bằng tiếng anh có đáp án

59

B.
2, 4, 5
C.
1, 3, 5
D.
2, 4

14. Assume class B is inherited from class A. Which of the following statements is correct
about construction of an object of class B?
A.

While creating the object firstly the constructor of class B will be called followed by
constructor of class A.
B.
While creating the object firstly the constructor of class A will be called followed
by constructor of class B.
C.
The constructor of only class B will be called.
D.
The constructor of only class A will be called.
E.
The order of calling constructors depends upon whether constructors inclass A and class
B are private or public.

15. Which of the following statements is correct about the C#.NET program given below?
namespace IndiabixConsoleApplication
{
class Baseclass
{
int i;
public Baseclass(int ii)
{
i = ii;
Console.Write("Base ");
}
}
class Derived : Baseclass
{
public Derived(int ii) : base(ii)
{
Console.Write("Derived ");

}
}
class MyProgram
{
static void Main(string[ ] args)
{
Derived d = new Derived(10);
}
}
}
Câu hỏi trắc nghiệm C# bằng tiếng anh có đáp án

60

A.
The program will work correctly only if we implement zero-argument constructors
in Baseclass as well as Derived class.
B.
The program will output: Derived Base
C.
The program will report an error in the statement base(ii).
D.
The program will work correctly if we replace base(ii) withbase.Baseclass(ii).
E.
The program will output: Base Derived


16. Multiple inheritance is different from multiple levels of inheritance.
A.
True

B.
False

17. An object of a derived class cannot access private members of base class.
A.
True
B.
False

18. The way a derived class member function can access base class public members, the
base class member functions can access public member functions of derived class.
A.
True
B.
False

19. There is no private or protected inheritance in C#.NET.
A.
True
B.
False

20. We can derive a class from a base class even if the base class's source code is not
available.
A.
True
B.
False

21. If a base class contains a member function func(), and a derived class does not contain

a function with this name, an object of the derived class cannot accessfunc().
A.
True
B.
False


22. If a base class and a derived class each include a member function with the same name,
the member function of the derived class will be called by an object of the derived class
A.
True
B.
False


23. The size of a derived class object is equal to the sum of sizes of data members in base
class and the derived class.