Which of the following methods is used to pass data from Controller to View in ASP.NET MVC?

The correct answer is A: ViewBag and ViewData. ViewBag (dynamic) and ViewData (dictionary) are common ways to pass data from Controller to View in ASP.NET MVC.

Consider: int[] arr = {1, 2, 3}; What happens when you try to resize it using Array.Resize(ref arr, 5)?

The correct answer is B: Creates new array with 5 elements, preserving first 3 values. Array.Resize() creates a new array of specified size and copies elements from the original array using the ref parameter.

Which of the following will correctly convert a string to an integer in C#?

The correct answer is B: int x = int.Parse("123");. int.Parse() converts a string to an integer. Direct casting doesn't work for strings. Convert.ToInt32() would throw an exception if the string is not a valid number. The 'as' operator doesn't work for strings to primitives.

What happens when you try to access an index beyond the Count in a List?

The correct answer is C: Throws IndexOutOfRangeException. Accessing an invalid index throws IndexOutOfRangeException. This is a runtime error that must be caught to prevent program crashes.

Which of the following collections preserves insertion order and is thread-safe?

The correct answer is B: ConcurrentDictionary. ConcurrentDictionary is thread-safe. While it doesn't strictly preserve insertion order like some collections, it's the thread-safe option among these choices.

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C# Programming
Basics & Syntax

C# and .NET for campus placement

56 Q 4 Topics Take Mock Test

Difficulty: All Easy Medium Hard 31–40 of 56

Topics in C# Programming

All Basics & Syntax 100 OOP in C# 100 Collections 71 ASP.NET Basics 19

Q.31 Medium Basics & Syntax

What happens when you try to access an array element beyond its length in C#?

A Returns null

B Returns default value of the type

C Throws IndexOutOfRangeException

D Returns the last element

Correct Answer: C. Throws IndexOutOfRangeException

EXPLANATION

Accessing an array index beyond its bounds throws an IndexOutOfRangeException at runtime.

Test

Q.32 Medium Basics & Syntax

Which of the following statements about properties in C# is TRUE?

A Properties can only have get accessors

B Properties can have get and/or set accessors with different access levels

C Properties cannot be overridden

D Properties must have both get and set accessors

Correct Answer: B. Properties can have get and/or set accessors with different access levels

EXPLANATION

Properties can have get and set accessors independently with different access modifiers like public get, private set.

Test

Q.33 Medium Basics & Syntax

What is the correct way to check if a string is null or empty in modern C#?

A string.IsNullOrEmpty(str)

B string.IsNullOrWhiteSpace(str)

C str == null || str.Length == 0

D Both A and C are correct

Correct Answer: D. Both A and C are correct

EXPLANATION

Both methods work correctly. IsNullOrEmpty checks for null or empty, IsNullOrWhiteSpace also considers whitespace.

Test

Q.34 Medium Basics & Syntax

How many dimensions does a jagged array have in the following declaration: int[][] arr;

A One

B Two

C Three

D Undefined

Correct Answer: B. Two

EXPLANATION

int[][] is a two-dimensional jagged array where each element is an array of integers of potentially different lengths.

Test

Q.35 Medium Basics & Syntax

Which access modifier provides access within the same assembly only?

A public

B private

C internal

D protected

Correct Answer: C. internal

EXPLANATION

'internal' modifier allows access within the same assembly but not from external assemblies.

Test

Q.36 Medium Basics & Syntax

Which of the following correctly demonstrates nullable type syntax in C#?

A int? x = null;

B nullable x = null;

C int x? = null;

D int* x = null;

Correct Answer: A. int? x = null;

EXPLANATION

The correct syntax for nullable types is 'type?' where ? makes the value type nullable, allowing null values.

Test

Q.37 Medium Basics & Syntax

What will be the output of: sbyte x = -128; sbyte y = x - 1; Console.WriteLine(y);

A -129

B 127

C overflow exception

D compilation error

Correct Answer: B. 127

EXPLANATION

sbyte range is -128 to 127. When overflow occurs without checked context, it wraps around to 127.

Test

Q.38 Medium Basics & Syntax

What will be the output of: int x = 10; int y = x; y = 20; Console.WriteLine(x);

A 10

B 20

C Compilation error

D Cannot determine

Correct Answer: A. 10

EXPLANATION

int is a value type. When y = x, a copy of x's value is assigned to y. Changing y doesn't affect x.

Test

Q.39 Medium Basics & Syntax

What is the purpose of the 'using' statement in C#?

A To import namespaces only

B To automatically dispose of resources implementing IDisposable

C To create aliases for types

D Both A and B

Correct Answer: D. Both A and B

EXPLANATION

using serves two purposes: importing namespaces and automatically disposing resources through IDisposable pattern.

Test

Q.40 Medium Basics & Syntax

Which of the following correctly declares a jagged array?

A int[,] arr = new int[3][4];

B int[][] arr = new int[3][];

C int[,] arr = new int[3,4];

D int[] arr = new int[3][4];

Correct Answer: B. int[][] arr = new int[3][];

EXPLANATION

Jagged arrays use [][] syntax. [,] is for multidimensional arrays. int[][] allows arrays of varying lengths.

Test

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