MCQs on Microprocessor


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01․ Which one of the following statement is false?
A microprocessor has bi-directional address bus
A microprocessor has unidirectional address bus
A microprocessor has bi-directional data bus
A microprocessor has an ALU

A microprocessor has unidirectional address bus.

02․ Identify the non-maskable interrupt from the following
RST 7.5
RST 6.5
RST 5.5
RST 4.5

One and only non-maskable interrupt in 8085 microprocessor is TRAP which is also known as RST 4.5

03․ In microprocessor based system DMA refers to
direct memory access for microprocessor
direct memory access for the user
direct memory access for the I/O device
none of the above

When more data is to be transferred between memory and I/O device DMA operation is used with the help of DMA controller.

04․ The interrupt facility is provided in microprocessor to
change the sequence of the instructions being executed
stop the microprocessor when desired
stop the microprocessor when it starts malfunctioning
keep a control on the working of the microprocessor

Interrupt facility is provided in the microprocessor to change the sequence of the instructions being executed.

05․ A microprocessor differentiates between op code, data/address at any time by
the sequence in which memory contents are fetched by it
its internal registers
the stack pointer
the program counter

A microprocessor differentiates between op code, data/address at any time by the sequence in which memory contents are fetched by it.

06․ A microprocessor without the interrupt facility
is best suited for process control system
is not useful for process control system
cannot be used for DMA operation
cannot be interfaced with any I/O devices

Interrupt facility is mandatory for any process control system to have proper control on the system.

07․ In microprocessor based system I/O ports are used to interface
the I/O devices and memory chips
the I/P device only
the O/P devices only
all the I/O devices

In microprocessor based system I/O ports are used to interface all the I/O devices.

08․ The stack pointer
resides in RAM
resides in ROM
resides in microprocessor
may be in RAM or ROM

Stack pointer is nothing but the register which holds the address of the top of the stack, resides within the microprocessor.

09․ In a microprocessor based system the stack is always in
microprocessor
RAM
ROM
EPROM

In a microprocessor based system the stack is always in Random Access Memory (RAM).

10․ The instruction set of a microprocessor
is specified by the manufacturers
is specified by the user
cannot be changed by the user
is stored inside the microprocessor

The instruction set of a microprocessor is specified by the manufacturers.

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