MCQs on Microprocessor


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01․ What is used to access 16-bit data in 8086?
Pipeline architecture.
Data Banking.
Memory Banking.
None of the above.

Memory banking is done to access 16-bit data which is stored in two consecutive locations. Hence, memory is divided into two banks: Even Bank and Odd Bank.

02․ What is the size (in bytes) of Prefetch queue in 8086?
6.
4.
3.
2.

The size of Prefetch queue is 6 bytes as this is the maximum size of an instruction.

03․ The address bus width of a microprocessor which is capable of addressing 64 Kbytes of the memory is
8
12
16
20

64 Kbytes = 26 × 210 bytes = 216 bytes Hence 16 address buses are required to address 64 Kbytes of memory.

04․ An 8-bit microprocessor can have ………….. address lines.
8
16
32
cannot be predicted

8-bit microprocessor gives the information that it requires 8 data bus but we cannot predict the number of address buses until and unless memory size is provided.

05․ A number of 1-bit registers used in microprocessors to indicate certain conditions are usually referred to as
shift registers
flags
latches
counters

Flags indicates certain conditions in microprocessor as a result of arithmetic and logic operations.

06․ The word size of 8085 microprocessor is
4-bit
8-bit
16-bit
20-bit

A word size of an 8085 microprocessor is 8-bit.

07․ How many 16-bit special purpose registers are present in 8085 microprocessor?
16
2
8
6

There are two 16-bit special purpose registers are present in the 8085 microprocessor i.e. program counter and stack pointer.

08․ The stack pointer register in a microprocessor
counts the number of programs being executing on the microprocessor
counts the number of instructions being executing on the microprocessor
keeps the address of the next instruction to be fetched
holds the address of the top of the stack

Stack pointer points out the address of the top of the stack memory.

09․ The number of status flags present in 8085 microprocessor are
8
16
5
10

The total numbers of status flags present in 8085 microprocessor are 5. They are S, Z, AC, P and CY.

10․ The number of hardware interrupts present in 8085 microprocessor are
5
8
16
10

There are five hardware interrupts are present in 8085 microprocessors i.e. TRAP, RST 7.5, RST 6.5, RST 5.5 and INTR .

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