Microprocessor

Which of the following is a data segment register of 80386?

• ES

• FS

• GS

• All of the mentioned

The register width used by the 32-bit addressing modes is

• 8 bits

• 16 bits

• 32 bits

• all of the mentioned

The virtual mode flag is to be set,only when 80386 is in

• virtual mode

• protected mode

• either virtual or protected mode

• all of the mentioned

Contents of an index register are multiplied by a scaling factor and then added to base register to get the operand offset in

• base scaled indexed mode

• scaled indexed mode

• indexed mode

• none of the mentioned

The unit that provides a four level protection mechanism,for system's code and data against application program is

• Central Processing unit

• Segmentation unit

• Bus interface unit

• none of the mentioned

What is the use of AX register

• Input/output operations

• In multiply and arithmetic instructions

• To store data

• All above

What is the use of direction flag?

• To auto increment SI and DI

• To auto decrement SI and DI

• To perform string operations

• All of above

What is the size of data bus in 80386DX microprocessor?

• 8-bit

• 16-bit

• 16-bit

• 32-bit

How much physical memory can be accessed by 80386DX microprocessor?

• 1 MB

• 4 MB

• 4 GB

• 64 TB

Which IOPL value has highest priority?

• 00

• 01

• 02

• 03