Variables and Constants in C Sharp MCQ question and answer with solution

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Current Affairs Interview Blog

What is the default value of a boolean variable in C# if not initialized explicitly?

A) FALSE B) TRUE C) 0 D) Null

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Answer & Solution

Answer: Option A

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Which of the following is NOT a valid constant name in C#?

A) CONSTANT B) CONSTANT1 C) _CONSTANT D) 1constant

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Answer & Solution

Answer: Option D

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In C#, which keyword is used to declare a variable without specifying its data type explicitly?

A) dynamic B) any C) var D) object

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Answer & Solution

Answer: Option C

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What is the scope of a global variable in C#?

A) Limited to the block in which it is declared B) Throughout the program C) Limited to the file in which it is declared D) None of the above

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Answer & Solution

Answer: Option B

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Which of the following is a valid way to declare and initialize a string variable in C#?

A) string = str; B) str Hello; C) string str = "Hello"; D) str = "Hello";

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Answer & Solution

Answer: Option C

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What is the purpose of declaring constants in C#?

A) To store and manipulate data B) To declare variables C) To handle exceptions D) To define values that do not change

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Answer & Solution

Answer: Option D

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What is the value of a variable in C# after it is declared but not assigned a value?

A) Depends on the data type B) 0 C) null D) undefined

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Answer & Solution

Answer: Option B

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In C#, what is the result of the expression 3 / 2?

A) 1 B) 1.5 C) 2 D) 0

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Answer & Solution

Answer: Option A

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Which keyword is used to exit a loop prematurely in C#?

A) continue B) skip C) exit D) break

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Answer & Solution

Answer: Option D

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What is the correct way to declare a nullable integer variable in C#?

A) num? int; B) var? num; C) int? num; D) nullable int num;

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Answer & Solution

Answer: Option C

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Variables and Constants in C Sharp MCQ question and answer with solution | C# Program MCQs