Questions and answers for exam Preparation

MCQs

Total Questions : 10

Question 1. Which among the following is the correct way to access all the elements of the Stack collection created using the C#.NET code snippet given below?Stack st = new Stack();st.Push(10);st.Push(20);st.Push(-5);st.Push(30);st.Push(6);

IEnumerable e;e = st.GetEnumerator();while (e.MoveNext())Console.WriteLine(e.Current);
IEnumerator e; e = st.GetEnumerator(); while(e.MoveNext()) Console.WriteLine(e.Current);
IEnumerable e; e = st.GetEnumerable(); while(e.MoveNext()) Console.WriteLine(e.Current);
None of the mentioned

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Answer: Option B. -> IEnumerator e; e = st.GetEnumerator(); while(e.MoveNext()) Console.WriteLine(e.Current);

Question 2. The property signifies "Obtains a Module object that represents the module (an executable file) in which the reflected type resides. Choose the property which specifies the following statement:

Type DeclaringType
int MetadataToken
Module Module
Type ReflectedType

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Answer: Option C. -> Module Module

Question 3. What will the given code snippet specify?class MyClass{ char chrs = 'A' ; public IEnumerator GetEnumerator() { for (int i = 20; i >=0; --i) if (i == 10) yield break; yield return (char)((chrs + i)); }}class Program{ static void Main(string[] args) { MyClass mc = new MyClass(); foreach (char ch in mc) Console.Write(ch + " "); Console.WriteLine(); Console.ReadLine(); }}

Code run successfully prints nothing
A B C D E F G H I J K L M N O P Q R S T U V
U T S R Q P O N M L
Compile time error

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Answer: Option C. -> U T S R Q P O N M L

The code to specify stoppage of the iterator using 'yield break' statement When this statement executes, the iterator signals that the end of the collection has been reached, which effectively stops the iterator.
Output: U T S R Q P O N M L

Question 4. What will be the output of the given code snippet?class Program{ static void Main(string[] args) { int[] nums = { 1 }; var posNums = from n in nums select Math.Pow(4 ,3); Console.Write("The values in nums: "); foreach (int i in posNums) Console.Write(i + " "); Console.WriteLine(); Console.ReadLine(); }}

Run time error
64
Compile time error
81

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Answer: Option B. -> 64

Question 5. Number of threads that exists for each of the processes that occurs in the program:

atmost 1
atleast 1
only 1
Both a & c

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Answer: Option D. -> Both a & c

All processes have at least one thread for execution, which is usually called the main thread because it is the primary thread that is
executed when our program begins.From the main thread, we can create other threads.

Question 6. What is mutex?

a mutually exclusive synchronization object
can be acquired by more than one thread at a time
helps in sharing of resource which can be used by one thread
All of the mentioned

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Answer: Option A. -> a mutually exclusive synchronization object

A mutex is a mutually exclusive synchronization object. This means it can be acquired by one and only one thread at a time. The mutex is designed for those situations in which a shared resource can be used by only one thread at a time

Question 7. Which of the following functions return absolute value of a variable?

Abs()
Absolute()
absolutevariable()
None of the mentioned

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Answer: Option A. -> Abs()

Abs() returns the absolute value of a variable

Question 8. The correct code to access all the elements of the queue collection created using the C#.NET code snippets given below is?Queue q = new Queue();q.Enqueue("Harsh");q.Enqueue('a');q.Enqueue(false);q.Enqueue(70);q.Enqueue(8.5);

IEnumerator e;e = q.GetEnumerator(); while(e.MoveNext()) Console.WriteLine(e.Current);
IEnumerable e; e = q.GetEnumerator(); while(e.MoveNext())
IEnumerable e e = q.GetEnumerable(); while(e.MoveNext()) Console.WriteLine(e.Current);
All of the mentioned

Discuss Question

Answer: Option A. -> IEnumerator e;e = q.GetEnumerator(); while(e.MoveNext()) Console.WriteLine(e.Current);

Question 9. Choose the method defined by MemberInfo:

GetCustomAttributes()
IsDefined()
GetCustomeAttributesData()
All of the mentioned

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Answer: Option D. -> All of the mentioned

MemberInfo includes two abstract methods: GetCustomAttributes( ) and IsDefined( ). These both relate to attributes. The first obtains a list of the custom attributes associated with the invoking object. The second determines if an attribute is defined for the invoking object. The .NET Framework Version 4.0 adds a method called GetCustomAttributesData(), which returns information about custom attributes

Question 10. What will be the output of the code snippet?class MyClass { int[] a = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20}; public IEnumerator GetEnumerator() { for (int i = 0; i < 20; i++) { if (a[i] % 2 == 0) yield return (int)(a[i]); } } } class Program { static void Main(string[] args) { MyClass mc = new MyClass(); foreach (int i in mc) Console.Write(i + " "); Console.WriteLine(); Console.ReadLine(); } }