CS401 Midterm Past Papers

MIDTERM EXAMINATION CS401Computer Architecture and Assembly Language Programming

Q1. After the execution of SAR instruction (1 marks)

1. The msb is replaced by a 0
2. The msb is replaced by 1
3. The msb retains its original value
4. The msb is replaced by the value of CF

Correct answer: The msb is replaced by a 0

Q2. RETF will pop the offset in the (1 marks)

1. BP
2. IP
3. SP
4. SI

Correct answer: IP

Q3. The routine that executes in response to an INT instruction is called (1 marks)

1. ISR
2. IRS
3. ISP
4. IRT

Correct answer: ISR

Q4. The first instruction of “COM” file must be at offset: (1 marks)

1. 0x0010
2. 0x0100
3. 0x1000
4. 0x0000

Correct answer: 0x0100

Q5. “Far” jump is not position relative but is _______________ (1 marks)

1. memory dependent
2. Absolute
3. temporary
4. indirect

Correct answer: Absolute

Q6. Only ___________ instructions allow moving data from memory to memory. (1 marks)

1. string
2. word
3. indirect
4. stack

Correct answer: string

Q7. After the execution of instruction “RET 2” (1 marks)

1. SP is incremented by 2
2. SP is decremented by 2
3. SP is incremented by 4
4. SP is decremented by 4

Correct answer: SP is incremented by 2

Q8. DIV instruction has (1 marks)

1. Two forms
2. Three forms
3. Four forms
4. Five forms

Correct answer: Two forms

Q9. When the operand of DIV instruction is of 16 bits then implied dividend will be of (1 marks)

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

Correct answer: 32 bits

Q10. After the execution of MOVS instruction which of the following registers are updated (1 marks)

1. SI only