Questions and answers for exam Preparation

MCQs

Total Questions : 10

Question 1. Choose the statements which makes delegate in C#.NET different from a normal class?

Delegates in C#.NET is a base class for all delegates type
Delegates created in C#.NET are further not allowed to derive from the delegate types that are created
Only system and compilers can derive explicitly from the Delegate or Multi caste Delegate class
All of the mentioned

Discuss Question

Answer: Option D. -> All of the mentioned

Question 2. Which of the following are the correct statements about delegates?

Delegates can be used to implement callback notification
Delegates permit execution of a method on a secondary thread in an asynchronous manner
Delegate is a user defined type
All of the mentioned

Discuss Question

Answer: Option D. -> All of the mentioned

Question 3. Which among the following is the correct statement about delegate declaration ?delegate void del(int i);

On declaring the delegate, a class called del is created
the del class is derived from the MulticastDelegate class
the del class will contain a one argument constructor and an invoke() method
all of the mentioned

Discuss Question

Answer: Option D. -> all of the mentioned

Question 4. Select the type argument of an open constructed type?

Gen
Gen.
Gen
None of the mentioned

Discuss Question

Answer: Option C. -> Gen

A generic type, such as Gen, is an abstraction.In C# terminology, a construct such as Gen is called an open constructed type, because the type parameter T (rather than an actual type, such as int) is specified.

Question 5. Which of the following is an incorrect statement about delegate?

A single delegate can invoke more than one method
delegates could be shared
delegates are type safe wrappers for function pointers
delegate is a value type

Discuss Question

Answer: Option C. -> delegates are type safe wrappers for function pointers

Question 6. Select the namespace which should be included while making use of LINQ operations:

System.Text
System.Collections.Generic
System.Linq
None of the mentioned

Discuss Question

Answer: Option C. -> System.Linq

Question 7. For the given set of codes, which query will work according to the set of code?class Program{ static void Main(string[] args) { int[] nums = { 1, -2, 3, 0, -4, 5 }; int len = /*_________________ */ Console.WriteLine("The number of positive values in nums: " + len); Console.ReadLine(); }}

from n in nums where n > 0 select n
from n in nums where n > 0 select n.Count()
(from n in nums where n > 0 select n).Count();
Both b & c

Discuss Question

Answer: Option C. -> (from n in nums where n > 0 select n).Count();

Question 8. Which of the following is a valid statement about generic procedures in C#.NET are?

All procedures in a Generic class are generic
Generic procedures should take at least one type parameter
Only those procedures labeled as Generic are Generic
None of the mentioned

Discuss Question

Answer: Option B. -> Generic procedures should take at least one type parameter

Question 9. Which among the given classes is present in System.Collection.Generic.namespace?

Stack
Tree
Sorted Array
All of the mentioned

Discuss Question

Answer: Option A. -> Stack

Question 10. Select the output for the given code snippet:class Program { static void Main(string[] args) { int[] nums = { 1, -2, 3, 0, -4, 5 }; var posNums = from n in nums where n % 2 ==0 select n; Console.Write("The positive values in nums: "); foreach (int i in posNums) Console.Write(i + " "); Console.WriteLine(); Console.ReadLine(); } }