Questions and answers for exam Preparation

MCQs

Total Questions : 10

Question 1. "A mechanism that binds together code and data in manipulates, and keeps both safe from outside interference and misuse.In short it isolates a particular code and data from all other codes and data. A well-defined interface controls the access to that particular code and data.

Abstraction
Polymorphism
Inheritance
Encapsulation

Discuss Question

Answer: Option D. -> Encapsulation

Question 2. Select the wrong statement about 'ref' keyword in C#?

References can be called recursively
The 'ref' keyword causes arguments to be passed by reference
When 'ref' are used, any changes made to parameters in method will be reflected in variable when control is passed back to calling method
All of above mentioned

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Answer: Option A. -> References can be called recursively

Question 3. How many values does a function return?

0
2
1
any number of values

Discuss Question

Answer: Option C. -> 1

a method can return only either single value or no value if no then it's declared as void method();

Question 4. Select correct differences between '=' and '==' in C#.

'==' operator is used to assign values from one variable to another variable '=' operator is used to compare value between two variables
'=' operator is used to assign values from one variable to another variable '==' operator is used to compare value between two variables
No difference between both operators
None of the mentioned

Discuss Question

Answer: Option B. -> '=' operator is used to assign values from one variable to another variable '==' operator is used to compare value between two variables

Question 5. What is the output for the following set of code :
static void Main(string[] args) { int i = 10; double d = 35.78; fun(i); fun(d); Console.ReadLine(); } static void fun(double d) { Console.WriteLine(d); }

35.78 10
10 35.00
10 35.78
None of the mentioned

Discuss Question

Answer: Option C. -> 10 35.78

'int' datatype is sub datatype of 'double'.Hence, when first part of func() is executed it is integer part and hence when second part is executed it is double.
Output:10
35.78

Question 6. Can the method add() be overloaded in the following ways in C#?public int add() { }public float add(){ }

True
False
None of the mentioned.
None of the Above

Discuss Question

Answer: Option B. -> False

C# provides feature of method overloading which means methods with same name but different types and arguments.

Question 7. Output from following set of code ?
class sample { int i; double k; public sample (int ii, double kk) { i = ii; k = kk; double j = (i) + (k); Console.WriteLine(j); } ~sample() { double j = i - k; Console.WriteLine(j); } } class Program { static void Main(string[] args) { sample s = new sample(8, 2.5); Console.ReadLine(); } }

0 0
10.5 0
Compile time error
10.5 5.5

Discuss Question

Answer: Option D. -> 10.5 5.5

First constructor 'sample' is called and hence then destructor '~sample' is evaluated.
Output : 10.5, 5.5

Question 8. Select wrong statement about destructor in C#?

A class can have one destructor only
Destructors cannot be inherited or overloaded
Destructors can have modifiers or parameters
All of above mentioned

Discuss Question

Answer: Option C. -> Destructors can have modifiers or parameters

Question 9. Which of the following statements is correct about constructors in C#.NET?

A constructor cannot be declared as private
A constructor cannot be overloaded
A constructor can be a static constructor
None of the mentioned

Discuss Question

Answer: Option C. -> A constructor can be a static constructor

Static constructor is a constructor which can be called before any object of class is created or any static method is invoked.Static constructor is implicitly called by .net CLR.

Question 10. Which of following statements about objects in "C# is correct?