CS401 MCQs Collection by Sonu Ilyas

CMPS instruction subtracts the source location to the destination location. Destination location always lies in

DS:SI DS:DI

ES:SI

ES:DI

Q4. Regarding assembler, which statement is true:

Assembler converts mnemonics to the corresponding OPCODE Assembler converts OPCODE to the corresponding mnemonics. Assembler executes the assembly code all at once Assembler executes the assembly code step by step

Q5. Iof “BB” is the OPCODE of the instruction which states to “move a constant value to AX register”, the hexadecimal representation (Using little Endian notation) of the instruction “Mov AX,336” (“150” in hexadecimal number system) will be:

0xBB0150 0x5001BB 0x01BB50 0xBB5001

Q6. In the instruction MOV AX, 5 the number of operands are

Q7. The maximum parameters a subroutine can receive (with the help of registers) are

Q8. In assembly the CX register is used normally as a ______________register.

source

counter

index pointer

Q9. All the addressing mechanisms in iAPX 8 8 return a number called _ _ _ _ _ _ _ _ _ _ _ _ _ address .

effective

faulty indirect direct

Q10. When a 16 bit number is divided by an 8 bit number, the dividend will be in

AX

BX CX DX

Q11. in Left-Shift-Operation the left most bit _______

will drop

will go into CF Will come to the right most will be always 1