Embedded C Programming MCQs January 8, 2026August 9, 2024 by u930973931_answers 20 min Score: 0 Attempted: 0/20 Subscribe 1. What is the primary purpose of Embedded C programming? (A) To develop web applications (B) To create desktop applications (C) To control hardware and interface with devices (D) To manage databases 2. Which standard library function is used to include input and output functionalities in Embedded C? 3. In Embedded C, which data type is used to represent an 8-bit unsigned integer? (A) int (B) short (C) long (D) char 4. What does the volatile keyword indicate in Embedded C? (A) The variable should be optimized by the compiler (B) The variable is constant and should not change (C) The variable is used only in loops (D) The variable can change at any time without any action being taken by the code the compiler finds nearby 5. Which function is typically used to initialize hardware peripherals in Embedded C? (A) main() (B) init() (C) configure() (D) setup() 6. What does the #define directive do in Embedded C? (A) Includes a library file (B) Declares a variable (C) Defines a constant value or macro (D) Creates a new function 7. Which operator is used to access a specific bit in a register in Embedded C? (A) & (B) | (C) << (D) [] 8. How do you handle timing and delays in Embedded C? (A) Using delay() function (B) Using timer interrupts (C) Using sleep() function (D) Using wait() function 9. What is the purpose of the ISR (Interrupt Service Routine) in Embedded C? (A) To perform mathematical operations (B) To handle hardware interrupts (C) To manage memory (D) To handle file I/O operations 10. In Embedded C, what is a common use of bit-fields in structures? (A) To create large arrays (B) To manage strings (C) To handle floating-point operations (D) To optimize memory usage by packing data into smaller bits 11. What is the function of the main() function in an Embedded C program? (A) To control the flow of the program (B) To initialize hardware peripherals (C) To define global variables (D) To handle interrupts 12. Which of the following is used to control an LED connected to a microcontroller pin in Embedded C? (A) printf() (B) digitalWrite() (C) scanf() (D) analogRead() 13. What does the static keyword do when applied to a function or variable in Embedded C? (A) Makes the function or variable dynamic (B) Makes the function or variable accessible globally (C) Prevents the function or variable from being used (D) Limits the scope of the function or variable to the file 14. Which of the following is NOT a common type of loop used in Embedded C? (A) for loop (B) while loop (C) foreach loop (D) do-while loop 15. What is the role of a watchdog timer in an Embedded C system? (A) To control the timing of data transmission (B) To monitor and reset the system if it becomes unresponsive (C) To handle user input (D) To manage power consumption 16. Which operator is used for bitwise XOR operation in Embedded C? (A) & (B) ^ (C) | (D) ~ 17. What is the purpose of the return statement in a function in Embedded C? (A) To exit from the function and optionally return a value (B) To initialize variables (C) To declare constants (D) To include header files 18. Which directive is used to include external files in an Embedded C program? (A) #ifdef (B) #define (C) #if (D) #include 19. How is a global variable declared in Embedded C? (A) By declaring it outside of any function (B) By using the static keyword (C) By using the extern keyword (D) By declaring it inside a function 20. What is the use of the extern keyword in Embedded C? (A) To create an inline function (B) To define a macro (C) To declare a global variable or function that is defined in another file (D) To include header files