CS401P Quiz 3

Q1. MOVS instruction is used to ____________

1. Move a memory location to register
2. Move memory to memory
3. Move register to a memory location
4. Move register to register

Correct answer: Move memory to memory

Q2. The last location of word, corresponding to the screen will be ______

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

Correct answer: 3998

Q3. Far calls are also called ______________ calls.

1. intra segment
2. obscure
3. inter segment
4. distant

Correct answer: inter segment

Q4. REP with _____will utilizes the full processor power to do the scrolling in minimum time

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

Correct answer: MOVS

Q5. mov byte [swap], 0 What does above code do?

1. It stores the byte value of 0 to location named as byte
2. It simply stores the 0 value to location named as byte
3. It simply stores the 0 value to location named as swap
4. It stores the byte value of 0 to location named as swap

Correct answer: It stores the byte value of 0 to location named as swap

Q6. Our computers screen is like a 2-D array having __________ rows and __________ columns.

1. 25, 40
2. 40, 25
3. 25, 80
4. 80, 25

Correct answer: 25, 80

Q7. Which of the following statement best describes the Shift Logical Right (SHR) operation?

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

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

Q8. Which of the following is base address for displaying any character in the Screen?

1. 0xb800
2. 0b800x
3. 0xb80
4. 0b800

Correct answer: 0xb800

Q9. SP is decremented by ___________ when an element is pushed on the stack.

1. 2
2. 1
3. 3
4. 4

Correct answer: 2

Q10. In string instructions, the mode is called auto-decrement mode when:

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

Correct answer: DF is set