gs gs108 Object Oriented Concepts - Polymorphism - Quiz No.1
gs gs108 CSharp Quiz
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Question 1: The capability of an object in Csharp to take number of different forms and hence display behaviour as according is known as ___________
Encapsulation
Polymorphism
Abstraction
None of the mentioned
Question 2: What will be the output of the following C# code?
public class sample { public static int x = 100; public static int y = 150; } public class newspaper :sample { new public static int x = 1000; static void Main(string[] args) { console.writeline(sample.x + " " + sample.y + " " + x); } }
100 150 1000
1000 150 1000
100 150 1000
100 150 100
Question 4: Correct way to overload +operator?
public sample operator + (sample a, sample b)
public abstract operator + (sample a,sample b)
public static sample operator + (sample a, sample b)
all of the mentioned
Question 5: What will be the Correct statement of the following C# code?
public class maths { public int x; public virtual void a() { } } public class subject : maths { new public void a() { } }
The subject class version of a() method gets called using sample class reference which holds subject class object
subject class hides a() method of base class
The code replaces the subject class version of a() with its math class version
None of the mentioned
Question 6: Select the sequence of execution of function f1(), f2() & f3() in C# .NET CODE?
class base { public void f1() {} public virtual void f2() {} public virtual void f3() {} } class derived :base { new public void f1() {} public override void f2() {} public new void f3() {} } class Program { static void Main(string[] args) { baseclass b = new derived(); b.f1 (); b.f2 (); b.f3 (); } } f1() of derived class get executed f2() of derived class get executed f3() of base class get executed f1() of base class get executed f2() of derived class get executed f3() of base class get executed f1() of base class get executed f2() of derived class get executed f3() of derived class get executed f1() of derived class get executed f2() of base class get executed f3() of base class get executed
Question 7: Which of the following statements is correct?
Each derived class does not have its own version of a virtual method
If a derived class does not have its own version of virtual method then one in base class is used
By default methods are virtual
All of the mentioned
Question 8: Correct code to be added for overloaded operator – for the following C# code?
class csharp { int x, y, z; public csharp() { } public csharp(int a ,int b ,int c) { x = a; y = b; z = c; } Add correct set of code here public void display() { console.writeline(x + " " + y + " " + z); } class program { static void Main(String[] args) { csharp s1 = new csharp(5 ,6 ,8); csharp s3 = new csharp(); s3 = - s1; s3.display(); } } } public static csharp operator -(csharp s1) { csharp t = new csharp(); t.x = s1.x; t.y = s1.y; t.z = -s1.z; return t; } public static csharp operator -(csharp s1) { csharp t = new csharp(); t.x = s1.x; t.y = s1.y; t.z = s1.z; return t; } public static csharp operator -(csharp s1) { csharp t = new csharp(); t.x = -s1.x; t.y = -s1.y; t.z = -s1.z; return t; }
None of the mentioned
Question 9: Selecting appropriate method out of number of overloaded methods by matching arguments in terms of number, type and order and binding that selected method to object at compile time is called?
Static binding
Static Linking
Compile time polymorphism
All of the mentioned
Question 10: Wrong statement about run time polymorphism is?
The overridden base method should be virtual, abstract or override
An abstract method is implicitly a virtual method
An abstract inherited property cannot be overridden in a derived class
Both override method and virtual method must have same access level modifier
