CS401 Quiz 1 Set 6

Q1. In case of 32-bit processor, the size of an accumulator register will be ___________ bits.

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

Correct answer: 32

Q2. ________________ instruction directs the flow of program.

1. Move
2. Program Control
3. Arithmetic
4. Special

Correct answer: Program Control

Q3. MOV AX, 0X4C00 INT 0X21 Which of the following best describes the purpose of the given instructions?

1. Move ax into 0X4C00
2. Terminate a program
3. Variable definition
4. Move number into ax

Correct answer: Terminate a program

Q4. Which of the following jump does not depend on flags register?

1. JO
2. JNE
3. JCXZ
4. JP

Correct answer: JCXZ

Q5. Which of the following is the most illegal instruction?

1. Mov ax, al
2. Mov al, [num1]
3. Mov al, ax
4. Mov ax, [num1]

Correct answer: Mov al, ax

Q6. Simple CMP instruction uses _____ operation.

1. Addition
2. Multiplication
3. Division
4. Subtraction

Correct answer: Subtraction

Q7. In ______________, a zero is inserted from the right and every bit moves one position to its left with the most significant bit dropped into the carry flag.

1. SHL
2. both SHL and SAL
3. SAR
4. SAL

Correct answer: both SHL and SAL

Q8. The correct instruction to subtract with borrow is ____________.

1. SWB
2. SBB
3. SUBB
4. SB

Correct answer: SBB

Q9. All mathematical and logical operations are performed on the _______________.

1. Program Counter
2. Accumulator
3. Arithmetic Logic Unit
4. Flags Register

Correct answer: Arithmetic Logic Unit

Q10. If AX=00FF, then which of the following instruction can be used to change the value of AX to FF00?

1. XOR AX, AX
2. NOT AX
3. OR AX, AX
4. AND AX, FF00

Correct answer: AND AX, FF00