Embedded Systems Programming MCQs January 8, 2026July 11, 2024 by u930973931_answers 50 min Score: 0 Attempted: 0/50 Subscribe 1. What is the purpose of an Interrupt Service Routine (ISR) in embedded systems? (A) To initialize the system (B) To handle asynchronous events (C) To execute the main program loop (D) To manage memory allocation 2. Which programming language is commonly used for embedded systems programming? (A) C/C++ (B) Java (C) Python (D) Ruby 3. Which of the following is a typical microcontroller component? (A) Disk drive (B) Flash memory (C) Keyboard (D) LCD monitor 4. What is the purpose of a watchdog timer in embedded systems? (A) To monitor the power supply voltage (B) To keep track of time (C) To prevent system crashes (D) To provide real-time clock functionality 5. Which memory type is most commonly used for storing program code in microcontrollers? (A) DRAM (B) Flash (C) SRAM (D) EEPROM 6. What is the primary function of a Real-Time Operating System (RTOS) in embedded systems? (A) To manage file systems (B) To provide graphical user interfaces (C) To handle network communication (D) To schedule tasks 7. Which of the following is not a commonly used communication protocol in embedded systems? (A) UART (B) SPI (C) I2C (D) HTTP 8. Which keyword is used in C to declare a variable that will persist across function calls? (A) local (B) extern (C) volatile (D) static 9. What is the purpose of the volatile keyword in embedded C programming? (A) To declare a constant variable (B) To optimize code size (C) To indicate that a variable may change unexpectedly (D) To declare a variable accessible from any function 10. Which register is used to enable and disable interrupts in an AVR microcontroller? (A) SREG (B) GICR (C) INTCON (D) EIMSK 11. In AVR microcontrollers, which function is used to define an ISR? (A) void interrupt ISR() {} (B) ISR = INT0 {} (C) void ISR_INT0() {} (D) ISR(INT0_vect) {} 12. Which timer/counter register stores the current value of a timer in AVR? (A) TCR (B) TCNT (C) TIMSK (D) TIFR 13. What is the role of the bootloader in embedded systems? (A) To update the firmware (B) To load the operating system (C) To initialize hardware peripherals (D) To control the boot sequence 14. Which statement about Little Endian and Big Endian systems is true? (A) Little Endian stores MSB first (B) Big Endian stores LSB first (C) Little Endian is more common in embedded systems (D) Big Endian is more efficient 15. Which directive is used in assembly language to include a file? (A) inc (B) include (C) import (D) macro 16. Which method helps reduce power consumption in embedded systems? (A) Using sleep modes (B) Increasing clock frequency (C) Adding more peripherals (D) Running background tasks continuously 17. Which memory stores non-volatile data in embedded systems? (A) SRAM (B) DRAM (C) Cache memory (D) EEPROM 18. What is an advantage of using DMA in embedded systems? (A) Increased power consumption (B) Reduced CPU overhead (C) Slower data transfer (D) Limited memory access 19. What is the purpose of a crystal oscillator? (A) Generate digital signals (B) Synchronize internal operations (C) Amplify audio (D) Regulate power 20. Which is NOT a typical embedded system application? (A) Laptop computer (B) Microwave oven (C) Digital camera (D) Automobile engine control 21. Which operation sets a specific bit without changing others? (A) Masking (B) OR (C) XOR (D) AND 22. Which statement about RTOS is true? (A) Does not support multitasking (B) Used for batch processing (C) Guarantees response within time constraints (D) Used only in supercomputers 23. Which memory stores temporary variables and stack data? (A) SRAM (B) EEPROM (C) Flash (D) ROM 24. Highest interrupt priority in ARM Cortex-M is: (A) 255 (B) 15 (C) 31 (D) 0 25. Common embedded system IDEs include: (A) Arduino IDE (B) All of the above (C) Eclipse (D) Visual Studio Code 26. Which interface operates in half-duplex mode? (A) SPI (B) UART (C) I2C (D) CAN 27. What does volatile indicate in C? (A) Value may change unexpectedly (B) Multi-thread access (C) Correct memory space (D) Constant variable 28. Which ARM register disables interrupts globally? (A) CONTROL (B) PRIMASK (C) NVIC (D) PENDSV 29. Difference between while and do-while loops? (A) while executes once minimum (B) do-while executes once minimum (C) No difference (D) Used interchangeably 30. Which keyword defines a constant pointer? (A) volatile (B) static (C) restrict (D) const 31. Purpose of a prescaler in timers? (A) Reduce power (B) Divide clock frequency (C) Synchronize clocks (D) Increase resolution 32. What does const keyword ensure? (A) Constant variable (B) Multi-function access (C) Always accessible (D) Value cannot change after initialization 33. Role of a linker? (A) Combine object files (B) Optimize size (C) Compile source code (D) Debug program 34. Which statement about bitwise operators is correct? (A) | is AND (B) & is OR (C) ^ is NOT (D) ~ is bitwise NOT 35. Bootloader code is stored in: (A) Flash (B) EEPROM (C) SRAM (D) Cache 36. Which is true about polling vs interrupts? (A) Interrupts introduce latency (B) Polling is more efficient (C) Polling suits real-time systems (D) Interrupts use more CPU 37. Which is NOT a debugging tool? (A) Logic analyzer (B) Oscilloscope (C) Multimeter (D) Compiler 38. Volatile with pointers means: (A) Correct arithmetic (B) Pointer points to volatile data (C) Faster dereferencing (D) Prevent memory leaks 39. NOT a common RTOS scheduler: (A) Round-robin (B) FCFS (C) Priority-based (D) Shortest Job Next 40. DMA bypasses which component? (A) CPU (B) Memory (C) Peripherals (D) OS 41. Register used for interrupt priority in ARM Cortex-M: (A) CONTROL (B) NVIC_PRI (C) PRIMASK (D) SysTick 42. Static variables: (A) Initialized to zero (B) Retain value between calls (C) Local to function (D) Not accessible outside file 43. True about pointers in C: (A) Used only for dynamic memory (B) Must always be dereferenced (C) Cannot point to structures (D) Access hardware registers 44. Which is NOT a valid C data type? (A) void (B) float (C) bool (D) double 45. Stack overflow occurs when: (A) Too many interrupts (B) Code is corrupted (C) Cannot be prevented (D) Stack pointer exceeds limit 46. NOT commonly used memory in MCUs: (A) SRAM (B) L2 cache (C) EEPROM (D) Flash 47. Bootloader role in embedded systems: (A) Handle UI (B) Manage peripherals (C) Load OS (D) Initialize clock 48. extern keyword means: (A) Shared across files (B) Function-only access (C) Constant variable (D) Immutable variable 49. True about bit fields: (A) Pack multiple fields efficiently (B) Must be int (C) Cannot map registers (D) Limited to 8 bits 50. GPIO pin direction register is: (A) PIN (B) PORT (C) DDR (D) ADC