✅ 20 code-based questions (focus on flags, registers, instructions like
MOV, ADD, MUL, CALL, RET, etc.)✅ 10 theory questions from the first lectures (interrupts, segments, flags, registers, etc.)
Questions (Multiple Choice)
Q1. Which interrupt is used for DOS services?
[ ] INT 10h
[✔️] INT 21h
[ ] INT 20h
[ ] INT 1Ah
Q2. What is the size of the 8086 address bus?
[✔️] 20 bits
[ ] 16 bits
[ ] 8 bits
[ ] 32 bits
Q3. Which register type stores flags?
[ ] AX
[ ] BX
[✔️] Status Register
[ ] Code Segment
Q4. What is the function of the
CALL instruction? [✔️] Push IP and jump to procedure
[ ] Return from procedure
[ ] Push data to stack
[ ] Compare values
Q5. Which segment handles instructions?
[✔️] Code Segment
[ ] Data Segment
[ ] Stack Segment
[ ] Extra Segment
Q6. What does the
LEA instruction load? [✔️] Effective address
[ ] Immediate value
[ ] Data
[ ] Flags
Q7. Which flag is set when signed overflow occurs?
[✔️] OF
[ ] CF
[ ] ZF
[ ] SF
Q8. Which instruction returns from a procedure?
[✔️] RET
[ ] CALL
[ ] JMP
[ ] PUSH
Q9. What is the difference between
CALL and MACRO? [✔️] Macro expands inline, CALL uses stack
[ ] CALL is faster than Macro
[ ] Macro uses stack
[ ] CALL expands code
Q10. What does the
JNE instruction check? [✔️] ZF = 0
[ ] ZF = 1
[ ] CF = 1
[ ] SF = 1
💻 Code-Based Questions (Multiple Choice)
Q11.
MOV AX, 0025h
MOV BX, 00FFh
MUL BX
Result in DX:AX?
[✔️] 0000:24DBh
[ ] 0001:24DBh
[ ] 24DBh:0000
[ ] 0000:25FFh
Q12.
MOV AX, 00FFh
DIV 10h
What are the values in AL and AH?
[✔️] AL = 0Fh, AH = 0Fh
[ ] AL = FFh, AH = 00h
[ ] AL = 10h, AH = 00h
[ ] AL = 00h, AH = FFh
Q13.
MOV AX, 0024h
ADD AX, CB11h
Which flags are affected?
[ ] ZF, CF
[✔️] OF, SF
[ ] None
[ ] ZF only
Q14.
MOV AX, 00FFh
INC AX
Which flags will be set?
[✔️] None (ZF=0, CF=0, OF=0, SF=0)
[ ] CF=1
[ ] ZF=1
[ ] OF=1
Q15.
MOV AX, 0000h
MOV BX, 4011h
ADD AX, BX
ADD BX, AX
Final value in BX?
[✔️] 8022h
[ ] 4011h
[ ] 0000h
[ ] 2000h
Q16.
CMP AX, BX
JL LessLabel
Jump occurs when:
[✔️] SF ≠ OF
[ ] ZF = 1
[ ] SF = OF
[ ] CF = 1
Q17.
CMP AX, BX
JG GreaterLabel
Jump occurs when:
[✔️] ZF = 0 and SF = OF
[ ] ZF = 1
[ ] SF ≠ OF
[ ] CF = 1
Q18.
MOV AX, 00FFh
MOV BX, 0001h
ADD AX, BX
Which flag is affected?
[✔️] None
[ ] ZF
[ ] OF
[ ] CF
Q19.
CALL Procedure
What does this instruction do?
[✔️] Pushes IP and jumps to procedure
[ ] Pops IP and returns
[ ] Pushes AX
[ ] Jumps without saving
Q20.
RET
What does this instruction do?
[✔️] Pops IP and returns to caller
[ ] Pushes IP
[ ] Ends program
[ ] Jumps to procedure
