Java MCQs – Control statements (if-else, switch-case, loops)

In Java programming, mastering control statements is crucial for creating efficient and dynamic code. Control statements empower developers to guide the program’s execution flow, enabling informed decision-making and iterative processes. Utilizing Java MCQs (Multiple Choice Questions) focused on control statements provides a valuable tool to assess one’s grasp of these fundamental constructs. These MCQs delve into essential topics such as conditional statements (if-else and switch), loops (for, while, and do-while), and the nuances of flow control. By actively engaging with Java MCQs related to control statements, learners can reinforce their understanding, hone problem-solving abilities, and unlock the potential to construct more robust and adaptive Java applications.

1.) What is the purpose of control statements in Java?

A) To perform mathematical calculations
B) To create objects
C) To declare variables
D) To control the flow of execution in a program

Answer: Option D

Explanation: Control statements are used in Java to make decisions and control the flow of program execution based on conditions.

2.) Which control statement is used to execute a block of code only if a certain condition is true?

A) switch-case
B) for loop
C) if-else
D) do-while loop

Answer: Option C

Explanation: The if-else statement is used to execute a block of code based on a condition. If the condition is true, the “if” block is executed; otherwise, the “else” block is executed.

3.) Which loop is guaranteed to execute at least once?

A) for loop
B) while loop
C) do-while loop
D) if-else loop

Answer: Option C

Explanation: The do-while loop first executes the code block and then checks the condition. Therefore, the code block is executed at least once.

4.) Which statement is used to terminate the current iteration of a loop and continue with the next iteration?

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

Answer: Option C

Explanation: The “continue” statement is used to skip the rest of the current iteration and proceed to the next iteration of the loop.

5.) Which control statement is used to execute different code blocks based on the value of an expression?

A) switch-case
B) if-else
C) for loop
D) while loop

Answer: Option C

Explanation: The switch-case statement allows you to execute different blocks of code based on the value of an expression.

6.) What is the purpose of the “default” case in a switch statement?

A) It specifies the default value of the expression.
B) It is used to compare the value of the expression.
C) It is executed when none of the cases match the value of the expression.
D) None of these.

Answer: Option C

Explanation: The “default” case is executed when none of the other cases match the value of the expression in a switch statement.

7.) What is the purpose of the “return” statement in a method?

A) To declare a variable
B) To exit the program
C) To specify the data type of the method
D) To return a value from the method

Answer: Option D

Explanation: The “return” statement is used to exit a method and return a value to the caller of the method.

8.) Which control statement is used to execute a block of code repeatedly as long as a condition is true?

A) if-else
B) switch-case
C) for loop
D) do-while loop

Answer: Option C

Explanation: A “for” loop repeatedly executes a block of code as long as the specified condition is true. It consists of an initialization, a condition, and an update statement.

9.) In a switch-case statement, what happens if there is no “break” statement after a case block?

A) The program will not compile.
B) Runtime error.
C) The next case block will be executed regardless of the condition.
D) The program will enter in an infinite loop.

Answer: Option C

Explanation: Without a “break” statement, the execution will “fall through” to the next case block, potentially executing multiple case blocks until a “break” is encountered or the switch-case ends.

10.) Which loop is suitable when you want to execute the loop body at least once?

A) for loop
B) while loop
C) do-while loop
D) switch-case loop

Answer: Option C

Explanation: The “do-while” loop first executes the loop body and then checks the condition. This guarantees that the loop body executes at least once.

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