CS401 Midterm Solved MCQs by Waqar Siddhu

CS401 Midterm Solved McQs Papers By Waqar Sidhu

(File 1)

Q1. In instruction ADC the operands can be

1. Two registers only
2. Two register and one memory location
3. ZF and two other operands

Q2. The attribute byte has

1. 32 possible background colors
2. 16 possible background colors
3. 4 possible background colors

Q3. Memory cell width refers to _________.

1. The maximum value that can be stored in a cell including sign-bit
2. The maximum value that can be stored in a cell excluding sign-bit
3. Address of that cell

Q4. Which of the following is true about Interrupt Flag

1. It tells whether processor can be interrupted from outside or not
2. It tells whether processor has interrupted or not
3. It is cleared when an interrupt occurs from outside
4. It is set when processor wants to generate an interrupt

Q5. When the operand of DIV instruction is of 16 bits then implied dividend will be of

1. 8 bits
2. 16 bits
3. 32 bits
4. 64 bits

Q6. If AX=5, BX=5, CF and ZF are set, AF and DX contains zero then after the execution of instruction “ADC AX, BX” , AX will contain the value:

1. 5
2. 10
3. 12

Q7. MS DOC used _______ display mode.

1. Graphics based
2. Numeric bases
3. Console based

Q8. Each screen location corresponds to a word, the lower byte of this word contains ______.

1. The attribute code
2. The parameters
3. The dimensions

Q9. Which of the following options contain the set of instructions to open a window to the video memory?

1. mov AX, 0xb008

mov ES, AX

mov ES, AX

✓ mov AX, ox8b00 mov ES, AX ✓ mov AX, ox800b mov ES,AX

Q10. Is STOSW instruction, SI is decremented or incremented by

1. 1
2. 3
3. 4

Q11. 8088 processor divides interrupts into _______ classes.

1. 3
2. 4
3. 5

Q12. MOVS instruction transfers a byte or word from which of the following source locations.

1. ES:DI
2. DS:DO
3. ES:SI

Q13. Which of the following is the pair of register used to access memory in string instruction?

1. DI and BP
2. DI and SI
3. SI and BP

Q14. When the instruction “CMP AX,BX” executes and after execution ZF is set, it indicated that

1. BX is greater
2. ZF has no relation with CMP
3. AX is greater