This section contains more frequently asked Microprocessors 8085 Fundamental MCQs in the various University Level and Competitive Examinations.

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1. Signal voltage ranges for a logic high and for a logic low in RS-232C standard are

  • Low = 0 volt to 1.8 volt, high = 2.0 volt to 5 volt
  • Low =-15 volt to –3 vol, high = +3 volt to +15 volt
  • Low = +3 volt to +15 volt, high = -3 volt to -15 volt
  • Low = 2 volt to 5.0 volt, high = 0 volt to 1.8 volt

2. The PCI bus is the important bus found in all the new Pentium systems because

  • It has plug and play characteristics
  • It has ability to function with a 64 bit data bus
  • Any Microprocessor can be interfaced to it with PCI controller or bridge
  • All of the above

3. Which of the following statement is true?

  • The group of machine cycle is called a state.
  • A machine cycle consists of one or more instruction cycle.
  • An instruction cycle is made up of machine cycles and a machine cycle is made up of number of states.
  • None of the above

4. 8251 is a

  • UART
  • USART
  • Programmable Interrupt controller
  • Programmable interval timer/counter

5. 8088 microprocessor has

  • 16 bit data bus
  • 4 byte pre-fetch queue
  • 6 byte pre-fetch queue
  • 16 bit address bus

6. By what factor does the 8284A clock generator divide the crystal oscillator’s output frequency?

  • One
  • Two
  • Three
  • Four

7. The memory data bus width in Pentium is

  • 16 bit
  • 32 bit
  • 64 bit
  • None of these

8. When the 82C55 is reset, its I/O ports are all initializes as

  • output port using mode 0
  • Input port using mode 1
  • output port using mode 1
  • Input port using mode 0

9. Which microprocessor pins are used to request and acknowledge a DMA transfer?

  • reset and ready
  • ready and wait
  • HOLD and HLDA
  • None o these

10. Which of the following statement is false?

  • RTOS performs tasks in predictable amount of time
  • Windows 98 is RTOS
  • Interrupts are used to develop RTOS
  • Kernel is the one of component of any OS
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