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Classes And Objects In C Sharp MCQs

Practice Classes And Objects In C Sharp MCQs for competitive exams.

Classes And Objects In C Sharp MCQs

Practice questions from this topic.

A type of class which does not have its own objects but acts as a base class for its subclass is known as?

  1. A. Static class
  2. B. Sealed class
  3. C. Abstract class
  4. D. None of the mentioned
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Choose the wrong statement about structures in C#.NET?

  1. A. Structures can be declared within a procedure
  2. B. Structures can implement an interface but they cannot inherit from another structure
  3. C. Structure members cannot be declared as protected
  4. D. A structure cannot be empty
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In Inheritance concept, which of the following members of base class are accessible to derived class members?

  1. A. static
  2. B. protected
  3. C. private
  4. D. shared
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What will be the output of the following C# code? class maths { public int fun(int ii) { return(ii > 0 ? ii :ii * -1); } public long fun(long ll) { return(ll > 0 ? ll :ll * -1); } public double fun( double dd) { return(dd > 0 ? dd :dd * -1); } } class Program { static void Main(string[] args) { maths obj = new maths(); int i = -25; int j ; long l = -100000l ; long m; double d = -12.34; double e; j = obj.fun(i); m = obj.fun(l); e = obj.fun(d); Console.WriteLine(j + " " + m + " " + e); Console.ReadLine(); } }

  1. A. 1 1 1
  2. B. 0 0 0
  3. C. 25 100000 12.34
  4. D. -25 -100000 -12.34
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What will be the output of the following C# code? static void Main(string[] args) { int y = 3; y++; if (y <= 5) { Console.WriteLine("hi"); Main(args); } Console.ReadLine(); }

  1. A. hi hi
  2. B. hi
  3. C. Stack overflow exception
  4. D. None of the mentioned
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What will be the output of the following C# code? enum letters { a, b, c } letters l; l = letters.a; Console.writeline(l);

  1. A. -1
  2. B. 0
  3. C. a
  4. D. letters.a
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What will be the output of the following C# code? static void Main(string[] args) { int []a = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; func(ref a); Console.ReadLine(); } static void func(ref int[] x) { Console.WriteLine(" numbers are:"); for (int i = 0; i < x.Length; i++) { if (x[i] % 2 == 0) { x[i] = x[i] + 1; Console.WriteLine(x[i]); } } }

  1. A. numbers are : 2 4 6 8 10
  2. B. numbers are : 3 5 7 9 11
  3. C. numbers are : 2 3 4 5 6
  4. D. none of the mentioned
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Which operator among the following signifies the destructor operator?

  1. A. ::
  2. B. :
  3. C. ~
  4. D. &
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Which of these will happen if the recursive method does not have a base case?

  1. A. Infinite loop condition occurrence
  2. B. System gets hanged
  3. C. After 10000 executions program will be automatically stopped
  4. D. None of the mentioned
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What will be the output of the following C# code? static void Main(string[] args) { int a = 10 , b = 20; Console.WriteLine("Result before swap is: "+ a +" "+b); swap(ref a, ref b); Console.ReadLine(); } static void swap(ref int i, ref int j) { int t; t = i; i = j; j = t; Console.WriteLine("Result after swap is:"+ i +" "+j); }

  1. A. Result before swap is: 20 10 Result after swap is: 20 10
  2. B. Result before swap is: 10 20 Result after swap is:20 10
  3. C. Result before swap is: 10 20 Result after swap is:10 20
  4. D. Result before swap is: 20 10 Result after swap is:10 20
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What will be the output of the following C# code? class maths { public static void fun1() { Console.WriteLine("method 1 :"); } public void fun2() { fun1(); Console.WriteLine("method 2 :"); } public void fun2(int k) { Console.WriteLine(k); fun2(); } } class Program { static void Main(string[] args) { maths obj = new maths(); maths.fun1(); obj.fun2(20); Console.ReadLine(); } }

  1. A. method 1: method 2: 20 method 1:
  2. B. method 2: 20 method 1: method 1:
  3. C. method 1: 0 method 2: method 2:
  4. D. method 1: 20 method 1: method 2:
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Which of the following cannot be used to declare a class as a virtual?

  1. A. Methods
  2. B. Properties
  3. C. Events
  4. D. Fields
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