CS401P Quiz 3 Set 2

Q1. REPE repeat the following string instruction while the _______is set.

1. Parity flag
2. Zero flag
3. Carry flag
4. Direction flag

Correct answer: Zero flag

Q2. The execution of the instruction "mov word [ES : 160], 0x1230" will print a character on the screen at:

1. Second column of first row
2. Second column of second row
3. First column of second row
4. First column of third row

Correct answer: First column of second row

Q3. The value of ____________ is recovered from the stack when RET instruction is executed.

1. SP
2. DS
3. IP
4. PC

Correct answer: IP

Q4. The ____ shifting is achieved by multiplying the number by 2.

1. Left
2. Right

Correct answer: Left

Q5. The last location of word, corresponding to the screen will be ______

1. 2000
2. 3998
3. 4000
4. 1998

Correct answer: 3998

Q6. If operand is 16bits in DIV instruction then dividend will be ____

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

Correct answer: 32-bits

Q7. REP with _____will utilizes the full processor power to do the scrolling in minimum time

1. MOVS
2. LES
3. REPNE
4. SCAS

Correct answer: MOVS

Q8. Which of the following statement best describes the Shift Logical Right (SHR) operation?

1. The Left most bit is transferred to AX
2. Inserts a zero from left and moves every bit one position to the right
3. Inserts a zero from right and moves every bit one position to the left
4. The Right most bit is transferred to AX

Correct answer: Inserts a zero from left and moves every bit one position to the right

Q9. In string instructions, the mode is called auto-decrement mode when:

1. DF is set
2. DF is cleared
3. CX is set
4. ZF is cleared

Correct answer: DF is set

Q10. In the assembly language program, when using div instruction, dividend is stored in ____

1. DI
2. Operand placed with div instruction
3. BX
4. AX

Correct answer: AX