C# MCQ Questions with answers and solutions Page 1

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Mr. Dubey

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📊 C#

Q. How many Bytes are stored by ‘Long’ Data type in C# .net?

(A) 8
(B) 4
(C) 2
(D) 1

💬 Discuss

✅ Correct Answer: (A) 8

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Q. Choose “.NET class” name from which data type “UInt” is derived?

(A) System.Int16
(B) System.UInt32
(C) System.UInt64
(D) System.UInt16

💬 Discuss

✅ Correct Answer: (B) System.UInt32

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📊 C#

Q. Correct Declaration of Values to variables ‘a’ and ‘b’?

(A) int a = 32, b = 40.6;
(B) int a = 42; b = 40;
(C) int a = 32; int b = 40;
(D) int a = b = 42;

💬 Discuss

✅ Correct Answer: (C) int a = 32; int b = 40;

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📊 C#

Q. What will be the error in the following C# code?

Code:

Static Void Main(String[] args)
 {
     const int m = 100;
     int n = 10;
     const int k = n / 5 * 100 * n ;
     Console.WriteLine(m * k);
     Console.ReadLine();
 }

(A) ‘k’ should not be declared constant
(B) Expression assigned to ‘k’ should be constant in nature
(C) Expression (m * k) is invalid
(D) ‘m ‘ is declared in invalid format

💬 Discuss

✅ Correct Answer: (B) Expression assigned to ‘k’ should be constant in nature

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Mr. Dubey

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📊 C#

Q. Arrange the following data type in order of increasing magnitude sbyte, short, long, int.

(A) long < short < int < sbyte
(B) sbyte < short < int < long
(C) short < sbyte < int < long
(D) short < int < sbyte < long

💬 Discuss

✅ Correct Answer: (B) sbyte < short < int < long

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Mr. Dubey

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📊 C#

Q. Which data type should be more preferred for storing a simple number like 35 to improve execution speed of a program?

(A) sbyte
(B) short
(C) int
(D) long

💬 Discuss

✅ Correct Answer: (A) sbyte

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Q. Which Conversion function of ‘Convert.TOInt32()’ and ‘Int32.Parse()’ is efficient?
i) Int32.Parse() is only used for strings and throws argument exception for null string
ii) Convert.Int32() used for data types and returns directly '0' for null string

(A) ii
(B) Both i, ii
(C) i
(D) None of the mentioned

💬 Discuss

✅ Correct Answer: (A) ii

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Mr. Dubey

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📊 C#

Q. Correct way to assign values to variable ‘c’ when int a=12, float b=3.5, int c;

(A) c = a + b;
(B) c = a + int(float(b));
(C) c = a + convert.ToInt32(b);
(D) c = int(a + b);

💬 Discuss

✅ Correct Answer: (C) c = a + convert.ToInt32(b);

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Mr. Dubey

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📊 C#

Q. Default Type of number without decimal is?

(A) Long Int
(B) Unsigned Long
(C) Int
(D) Unsigned Int

💬 Discuss

✅ Correct Answer: (C) Int

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Mr. Dubey

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📊 C#

Q. What will be the output of the following C# code?

Code:

static void Main(string[] args)
 {
     float a = 10.553f;
     long b = 12L;
     int  c;
     c = Convert.ToInt32(a + b);
     Console.WriteLine(c);
 }

(A) 23.453
(B) 22
(C) 23
(D) 22.453

💬 Discuss

✅ Correct Answer: (C) 23

C# MCQs with answers Page - 1

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