Linq _Language Integrated Query_ In C Sharp — Part 2 MCQs with Explanations

TakeLast is the correct answer to “Which LINQ operator is used to return a specified number of contiguous elements from the end of a sequence”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

Reverses the order of the elements in a sequence is the correct answer to “In LINQ, what does the Reverse operator do”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

Merges two sequences by using the elements of both sequences is the correct answer to “What is the purpose of the Zip operator in LINQ”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

TakeWhile is the correct answer to “Which LINQ operator is used to return elements from a sequence until a specified condition becomes false”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

Returns the element at a specified index in a sequence, or a default value if the index is out of range is the correct answer to “In LINQ, what does the ElementAtOrDefault operator do”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

No is the correct answer to “Can we use linq to query against a DataTable”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

typeof is the correct answer to “Which operator among the following supplies the information about the characteristics of a typeof”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

1 -2 0 0 -1 2 is the correct answer to “What will be the output of the following C# code snippet? class Program { static void Main(string[] args) { int[] nums = { 1, -2, 3, 0, -4, 5 }; var posNums = nums.Where(n => n < 10).Select(r => r%3); Console.Write("The values in nums: "); foreach (int i in posNums) Console.Write(i + " "); Console.WriteLine(); Console.ReadLine(); } }”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

var sortedProds = _db.Products.Orderby(c => c.Category) . ThenBy(n => n.Name) is the correct answer to “Assume 2 columns named as Product and Category how can be both sorted out based on first by category and then by product name”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

a is an A This won't display -- a not derived from B is the correct answer to “What will be the output of the following C# code snippet? class B { } class A : B { } class Program { static void Main(string[] args) { A a = new A(); B b = new B(); if (a is A) Console.WriteLine("a is an A"); if (b is A) Console.WriteLine("b is an A because it is derived from A"); if (a is B) Console.WriteLine("This won’t display -- a not derived from B"); Console.ReadLine(); } }”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

google.net netflix.net is the correct answer to “What will be the output of the following C# code snippet? class Program { static void Main(string[] args) { string[] strs = { ".com", ".net", "facebook.com", "google.net", "test", "netflix.net", "hsNameD.com" }; var netAddrs = from addr in strs where addr.Length > 4 && addr.EndsWith(".net", StringComparison.Ordinal) select addr; foreach (var str in netAddrs) Console.WriteLine(str); Console.ReadLine(); } }”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

code run successfully prints multiple of 2 is the correct answer to “What will be the output of the following C# code snippet? class Program { static void Main(string[] args) { int[] nums = { 1, -2, 3, 0, -4, 5 }; var posNums = nums.Where(n => n > 0).Select(r => r*2). OrderByDescending(r=>r); Console.Write("The positive values in nums: "); foreach(int i in posNums) Console.Write(i + " "); Console.WriteLine(); Console.ReadLine(); } }”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

System.IO.StreamReader Is a class Is concrete is the correct answer to “What will be the output of the following C# code snippet? class UseTypeof { static void Main() { Type t = typeof(StreamReader); Console.WriteLine(t.FullName); if(t.IsClass) Console.WriteLine("Is a class."); if(t.IsAbstract) Console.WriteLine("Is abstract."); else Console.WriteLine("Is concrete."); } }”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

TRUE 9 is the correct answer to “What will be the output of the following C# code snippet? static void Main(string[] args) { int[] nums = { 5, 4, 6, 3, 14, 9, 8, 17, 1, 24, -1, 0 }; Array.Sort(nums); int idx = Array.BinarySearch(nums, 14); if (idx == 9) { Console.WriteLine(Convert.ToBoolean(1)); } else { Console.WriteLine(Convert.ToBoolean(0)); } Console.WriteLine("Index of 14 is " + idx); Console.ReadLine(); }”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

System.Linq.Expressions is the correct answer to “Choose the namespace in which Expression trees are encapsulated”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

Runtime type ID is the correct answer to “Which mechanism among the following helps in identifying a type during the execution of a program”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

(from n in nums where n > 0 select n).Count() is the correct answer to “In the following C# code, 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(); } }”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

Both The IComparer is in System.Collections.Generic & It defines a generic form of Compare() is the correct answer to “Choose the correct statement about the IComparer interface in C#”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

Code runs successfully prints required output is the correct answer to “What will be the output of the following C# code snippet? class Program { static void Main(string[] args) { int[] nums = {1}; var posNums = from n in nums wheres n > 0 select Math.Max(78, 9); Console.Write("The largest values in nums: "); foreach (int i in posNums) Console.Write(i + " "); Console.WriteLine(); Console.ReadLine(); } }”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

all of the mentioned is the correct answer to “What does the following property defined in the array class defines in C#? public bool IsReadOnly { get; }”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

System.Collections.Generic is the correct answer to “Choose the namespace in which the interface IEnumerable is declared”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

Both is, as & as, typeof is the correct answer to “Select the Keyword which supports the run time type identification”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

5, 4, 3, 2, 1 is the correct answer to “What will be the output of the following C# code snippet? static void Main() { int[] nums = { 1, 2, 3, 4, 5 }; Console.Write("Original order: "); foreach(int i in nums) Console.Write(i + " "); Array.Reverse(nums); Console.Write("Reversed order: "); foreach(int i in nums) Console.Write(i + " "); Console.WriteLine(); }”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

It is not required that linq should make use of IEnumerable interface is the correct answer to “Choose the wrong statement about the LINQ”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

1, 3, 0, 5 is the correct answer to “What will be the output of the following C# 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 >= 0 select n; foreach (int i in posNums) Console.Write(i + " "); Console.WriteLine(); Console.ReadLine(); } }”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

Only IEnumerable, IStructuralComparable, IStructuralEquatable & ICloneable, ICollection, IList is the correct answer to “Select the interfaces implemented by array class.”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

Arranged in descending order code runs successfully is the correct answer to “What will be the output of the following C# 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 > -5 && n < 6 orderby n descending select n; Console.Write("The positive values in nums: "); foreach (int i in posNums) Console.Write(i + " "); Console.WriteLine(); Console.ReadLine(); } }”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

Array is the correct answer to “Select the class which is the base class for all arrays in C#”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

code run successfully and executes output is the correct answer to “What will be the output of the following C# 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(); } }”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

Code runs successfully prints required output is the correct answer to “What will be the output of the following C# code snippet? class Program { static void Main(string[] args) { int[] nums = { 16, 9, 25}; var posNums = from n in nums where n > 0 select Math.Sqrt(n); Console.Write("The positive values in nums: "); foreach (int i in posNums) Console.Write(i + " "); Console.WriteLine(); Console.ReadLine(); } }”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

System.Linq is the correct answer to “Select the namespace which should be included while making use of LINQ operations”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

10 2 -4 -6 is the correct answer to “What will be the output of the following C# code snippet? class Program { static void Main(string[] args) { int[] nums = { 1, -2, -3, 5 }; var posNums = from n in nums orderby n descending select n*4 / 2; Console.Write("The values in nums: "); foreach (int i in posNums) Console.Write(i + " "); Console.WriteLine(); Console.ReadLine(); } }”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

The cast in b = (B) a is NOT allowed is the correct answer to “What will be the output of the following C# code snippet? class A {} class B : A {} class CheckCast { static void Main() { A a = new A(); B b = new B(); b = a as B; b = null; if(b==null) Console.WriteLine("The cast in b = (B) a is NOT allowed."); else Console.WriteLine("The cast in b = (B) a is allowed"); } }”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

All of the mentioned is the correct answer to “Select the statement which are correct about RTTI(Runtime type identification)”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

Execution of code with counting total numbers greater than zero is the correct answer to “In the following C# code, what does the output represent? class Program { static void Main(string[] args) { int[] nums = { 1, -2, 3, 0, -4, 5 }; var posNums = from n in nums where n > 0 select n; int len = posNums.Count(); Console.WriteLine(len); Console.ReadLine(); } }”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

Array elements: beta alpha gamma Array elements now: gamma alpha beta is the correct answer to “What will be the output of the following C# code snippet? static void Main(string[] args) { string[] strings = {"beta", "alpha", "gamma"}; Console.WriteLine("Array elements: "); DisplayArray(strings); Array.Reverse(strings); Console.WriteLine("Array elements now: "); DisplayArray(strings); Console.ReadLine(); } public static void DisplayArray(Array array) { foreach (object o in array) { Console.Write("{0} ", o); } Console.WriteLine(); }”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

Determines the type of an object is the correct answer to “What does the following C# code signify? expr is type”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

as is the correct answer to “Which operator among the following is used to perform the operation of boxing, unboxing, reference and identity conversions”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

The search begins at the index specified by index and is restricted to length elements. Returns the index of the first match is the correct answer to “What does the following property define in C#? public static int BinarySearch<T>(T[] array, int index, int length, T value)”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.

5 is a factor of 10 is the correct answer to “What will be the output of the following C# code snippet? class Program { static void Main(string[] args) { Expression<Func<int, int, bool>> IsFactorExp = (n, d) => (d != 0) ? (n % d) == 0 : false; Func<int, int, bool> IsFactor = IsFactorExp.Compile(); if (IsFactor(10, 5)) Console.WriteLine("5 is a factor of 10."); if (!IsFactor(343, 7)) Console.WriteLine("7 is not a factor of 10."); Console.ReadLine(); } }”. This question is standard in competitive examination syllabi for Linq _Language Integrated Query_ In C Sharp.