Control Flow: Master the Order of Program Execution

Question 1

Which combination of control flow statements allows a task to be executed either immediately or at a later time?

Accepted Answer

if-else statement and sleep function

Answer

while loop and switch statement

Answer

for loop and do-while loop

Answer

switch statement and if-then-else statement

Question 2

Which of the following is used to execute a block of code only if a specified condition is true?

Accepted Answer

if statement

Answer

for loop

Answer

do-while loop

Answer

switch statement

Question 3

What is the primary purpose of the 'else' clause in an if statement?

Accepted Answer

It executes a block of code if the condition in the 'if' clause is false.

Answer

It terminates the if statement.

Answer

It defines the condition to be tested.

Answer

It executes a block of code if the condition in the 'if' clause is true.

Question 4

Which type of loop executes a block of code a fixed number of times?

Accepted Answer

for loop

Answer

do-while loop

Answer

switch statement

Answer

while loop

Question 5

What is the key difference between a 'break' and 'continue' statement within a loop?

Accepted Answer

'Break' terminates the loop, while 'continue' skips to the next iteration.

Answer

Both 'break' and 'continue' terminate the loop.

Answer

'Continue' terminates the loop, while 'break' skips to the next iteration.

Answer

There is no difference between 'break' and 'continue' statements.

Question 6

Which of the following correctly initializes a switch statement?

Accepted Answer

switch (expression)

Answer

for (expression)

Answer

while (expression)

Answer

if (expression)

Question 7

What is the purpose of a 'case' statement within a switch statement?

Accepted Answer

It defines a specific value or range of values to be matched.

Answer

It defines a block of code to be executed.

Answer

It terminates the switch statement.

Answer

It defines the condition to be tested.

Question 8

What is the primary distinction between a 'do-while' and a 'while' loop?

Accepted Answer

A 'do-while' loop executes its body at least once, while a 'while' loop may not execute its body at all.

Answer

A 'do-while' loop is a type of for loop, while a 'while' loop is a type of if statement.

Answer

A 'while' loop executes its body at least once, while a 'do-while' loop may not execute its body at all.

Answer

There is no difference between 'do-while' and 'while' loops.

Question 9

Which of the following is a common use case for a ternary operator ('? :')?

Accepted Answer

It simplifies conditional expressions.

Answer

It defines conditional loops.

Answer

It creates complex multi-level if-else statements.

Answer

It replaces switch statements.

Question 10

What is the purpose of the 'default' statement in a switch statement?

Accepted Answer

It defines code to be executed if none of the case statements match.

Answer

It terminates the switch statement.

Answer

It defines the condition to be tested.

Answer

It defines a loop to iterate through the case statements.

Question 11

Explain how you would use control flow statements to ensure that a user enters a valid input in a program that calculates the area of a triangle.

Accepted Answer

Use an if statement to validate the input and display an error message if invalid.

Accepted Answer

Use a loop to continuously prompt the user for valid input until it is entered.

Answer

Use a switch statement to validate the input and execute different code blocks based on the input.

Answer

Use a try-catch block to handle invalid input and provide a custom error message.

Question 12

Which of the following is the correct syntax for an if statement in Python?

Accepted Answer

if (condition):

Answer

if {condition}

Answer

if [condition]

Answer

If (condition) :

Question 13

When a break statement is used within a loop, what does it cause?

Accepted Answer

Immediate termination of the loop.

Answer

Transfer of control to the statement after the loop.

Answer

Skipping the current iteration of the loop.

Answer

Temporary suspension of the loop's execution.

Question 14

In Java, what is the proper syntax for a switch statement?

Accepted Answer

switch(expression) { case value1: ... }

Answer

Switch (expression) : { case value1: ... }

Answer

switch (expression): { case value1... }

Answer

switch [expression] { case value1: ... }

Question 15

What differentiates a do-while loop from a while loop in JavaScript?

Accepted Answer

In a do-while loop, the loop body is always executed once, even if the condition is false.

Answer

In a while loop, the loop body is executed as long as the condition is true.

Answer

A do-while loop is executed only when the condition is true.

Question 16

Which logical operator is not recognized in C++?

Accepted Answer

&&|

Answer

&&

Answer

||

Question 17

What purpose does the continue statement serve within a loop?

Accepted Answer

It skips the remaining statements in the current iteration and proceeds to the next one.

Answer

It temporarily halts the execution of the loop.

Answer

It exits the loop immediately.

Question 18

Identify the correct syntax for a for-each loop in Python.

Accepted Answer

for item in iterable:

Answer

for item -> iterable:

Answer

For item on iterable:

Answer

for item := iterable:

Question 19

Consider the following Java code snippet: int x = 5; if (x > 3) { if (x < 10) { System.out.println('Hello'); } else { System.out.println('World'); } } What output will this code produce?

Accepted Answer

Hello

Answer

Compilation error

Answer

Hello World

Answer

World

Question 20

What is the proper syntax for a conditional ternary operator in JavaScript?

Accepted Answer

condition ? expression1 : expression2

Answer

condition : expression1 ? expression2

Answer

condition -> expression1 ? expression2

Answer

If (condition) { expression1 } else { expression2 }

Question 21

What is the fundamental purpose of using a while loop in programming?

Accepted Answer

To repeatedly execute a block of code while a given condition remains true.

Answer

To cycle through a sequence of values.

Answer

To manage errors and exceptions.

Question 22

Which of the following accurately describes the purpose of if-else statements in programming?

Accepted Answer

They enable conditional execution of code based on a given condition.

Answer

They are primarily designed for handling user input.

Answer

They are used to iterate over a sequence of values.

Answer

They are not commonly used in control flow.

Question 23

Which type of loop statement is specifically designed to execute a block of code a predetermined number of times?

Accepted Answer

for loop

Answer

do-while loop

Answer

while loop

Answer

foreach loop

Question 24

What is the primary function of the break statement when used within a loop?

Accepted Answer

To terminate the execution of the loop immediately.

Answer

To skip the execution of the current iteration of the loop.

Answer

To pause the execution of the loop temporarily.

Answer

To restart the loop from its initial iteration.

Question 25

Which of the following is NOT a valid comparison operator that can be used in conditional statements?

Accepted Answer

<>

Answer

>

Answer

<=

Answer

==

Question 26

How does a do-while loop differ from a while loop in terms of its execution behavior?

Accepted Answer

A do-while loop executes its code block at least once, regardless of the initial condition evaluation.

Answer

A while loop always executes its code block at least once.

Answer

A while loop always exits immediately if the condition is false.

Answer

A do-while loop can only be used with true conditions.

Question 27

What is the intended purpose of the default case in a switch statement?

Accepted Answer

To handle situations where the input value does not match any other defined cases.

Answer

To terminate the execution of the switch statement.

Answer

To skip the execution of the switch statement.

Answer

To repeat the execution of the previous case.

Question 28

In what scenarios are switch statements commonly used in programming?

Accepted Answer

Menu-driven applications

Answer

Mathematical calculations

Answer

Random number generation

Answer

Data sorting

Question 29

Which statement is used to execute a block of code only if a specific condition is true?

Accepted Answer

if (condition) { ... }

Answer

while (condition) { ... }

Answer

for (initialization; condition; increment) { ... }

Answer

switch (variable) { ... }

Question 30

Which type of loop allows a block of code to be executed a specified number of times?

Accepted Answer

for (initialization; condition; increment) { ... }

Answer

while (condition) { ... }

Answer

do { ... } while (condition);

Answer

until (condition) { ... }

Question 31

What is the primary purpose of a break statement within a loop?

Accepted Answer

Immediately terminate the current iteration of the loop

Answer

Repeat the current iteration of the loop

Answer

Continue the execution of the loop body

Answer

Skip the next iteration of the loop

Question 32

In JavaScript, which keyword is used to define a function?

Accepted Answer

function

Answer

subroutine

Answer

def

Answer

procedure

Question 33

What is the distinction between a parameter and an argument in a function call?

Accepted Answer

Parameters are declared in the function definition, while arguments are passed when the function is invoked

Answer

Parameters are passed when the function is invoked, while arguments are declared in the function definition

Answer

Parameters and arguments always have the same value

Question 34

What is the time complexity of a linear search algorithm?

Accepted Answer

O(n)

Answer

O(1)

Answer

O(n^2)

Answer

O(log n)

Question 35

Which sorting algorithm employs a divide-and-conquer approach?

Accepted Answer

Merge sort

Answer

Bubble sort

Answer

Selection sort

Answer

Insertion sort

Question 36

What is the primary purpose of a binary tree data structure?

Accepted Answer

To efficiently store and search data in a hierarchical manner

Answer

To store data linearly in a linked list

Answer

To store data in a first-in, first-out order like a queue

Answer

To store data in a last-in, first-out order like a stack

Question 37

Which control flow statement is used to execute a block of code if and only if a condition is met?

Accepted Answer

if statement

Answer

while loop

Answer

switch statement

Answer

do-while loop

Question 38

What is the correct syntax for an if statement in Java?

Accepted Answer

if (condition) { statements; }

Answer

if (condition) statements;

Answer

if condition statements;

Answer

if { condition; statements; }

Question 39

What is the primary purpose of the 'break' statement within a loop?

Accepted Answer

To immediately exit the loop

Answer

To pause the execution of the loop

Answer

To continue to the next iteration of the loop

Answer

To skip the current iteration of the loop

Question 40

Which loop structure is ideal for iterating over a collection of elements?

Accepted Answer

for-each loop

Answer

while loop

Answer

do-while loop

Answer

switch statement

Question 41

Distinguish between an if-else statement and an if-else if statement.

Accepted Answer

An if-else if statement allows for multiple conditions to be evaluated sequentially.

Answer

An if-else if statement is exclusively used with boolean conditions.

Answer

An if-else if statement is more concise than an if-else statement.

Question 42

What is the function of a case label in a switch statement?

Accepted Answer

To associate a specific value of the switch expression with the following block of code

Answer

To indicate the default code block to be executed

Answer

To exit the switch statement

Question 43

Provide the correct syntax for a switch statement in Java.

Accepted Answer

switch (expression) { case value: statements; }

Answer

switch { expression; case value: statements; }

Answer

case { expression; value: statements; }

Answer

switch expression { case value: statements; }

Question 44

What differentiates a while loop from a do-while loop?

Accepted Answer

A do-while loop guarantees execution of its body at least once.

Answer

A do-while loop is more concise than a while loop.

Answer

A while loop can only be used with boolean conditions.

Question 45

Which control flow statement enables jumping out of a nested loop?

Accepted Answer

break statement

Answer

continue statement

Answer

return statement

Answer

exit statement

Question 46

Select the control flow statement that allows a program to execute a block of code multiple times until a condition is met.

Accepted Answer

While loop

Answer

Switch statement

Answer

For loop

Answer

If-else statement

Question 47

In an if-else statement, which condition gets executed if the specified condition is false?

Accepted Answer

Else

Answer

Then

Answer

Else if

Answer

If not

Question 48

What is the purpose of a break statement within a loop?

Accepted Answer

To prematurely exit the loop

Answer

To increment the loop counter

Answer

To execute the loop body

Answer

To evaluate the loop condition

Question 49

In a switch statement, what do you call the case that handles all other conditions not explicitly specified?

Accepted Answer

Default

Answer

Case

Answer

Else

Answer

Break

Question 50

Which operator can be used to compare the values of two variables within a loop condition?

Accepted Answer

== or !=

Answer

< or >

Answer

&& or ||

Answer

= or !=

Question 51

Explain the key difference between do-while and while-do loops.

Accepted Answer

Do-while loops execute the body at least once, regardless of the condition, while while-do loops only execute the body if the condition is initially true.

Answer

While-do loops execute the body at least once, regardless of the condition, while do-while loops only execute the body if the condition is initially true.

Question 52

Which of the following is not a valid reserved keyword used in control flow statements in most programming languages?

Accepted Answer

Loop

Answer

Else

Answer

If

Answer

Switch

Question 53

What is an effective way to prevent a loop from executing indefinitely?

Accepted Answer

Incorporate a break or return statement within the loop's body.

Answer

Set the loop counter to an extremely large value.

Answer

Use a do-while loop instead of a while-do loop.

Question 54

Which of the following is considered a best practice for writing control flow statements?

Accepted Answer

Use proper indentation and spacing to enhance readability.

Answer

Nest control flow statements as deeply as possible to save space.

Answer

Employ GOTO statements to navigate the code.