CS401 Midterm MCQs

Solved MCQS From Midterm Papers

May 02,2011

PSMD01(IEMS)

Q1. The first instruction of “COM” file must be at offset: (1 marks)

1. 0x0010
2. 0x0100 (Page 19)
3. 0x1000
4. 0x0000

Correct answer: 0x0100 (Page 19)

Q2. The execution of the instruction “mov word [ES : 0], 0x0741” will print character “A” on screen , background color of the screen will be (1 marks)

1. Black (Page 81)
2. White
3. Red
4. Blue

Correct answer: Black (Page 81)

Q3. (1 marks)

1. 12
2. 14
3. 16 (Page 15)
4. 18

Correct answer: 16 (Page 15)

Q4. The execution of the instruction “mov word [ES: 0], 0x0741” will print “A” on the screen, color of the character will be (1 marks)

1. Black
2. White (Page 81)
3. Red
4. Blue

Correct answer: White (Page 81)

Q5. One screen location corresponds to a (1 marks)

1. Byte
2. Word (Page 80)
3. Double byte

Correct answer: Word (Page 80)

Double word

Q6. When an item is pushed on the decrementing stack, the top of the stack is (1 marks)

1. First decremented and then element copied on to the stack (Page 68)
2. First incremented and then element copied on to the stack
3. Decremented after the element copied on to the stack
4. Incremented after the element copied on to the stack

Correct answer: First decremented and then element copied on to the stack (Page 68)

Q7. Each screen location corresponds to a word, the lower byte of this word contains ____ (1 marks)

1. The character code (Page 81)
2. The attribute byte
3. The parameters
4. The dimensions

Correct answer: The character code (Page 81)

Q8. if ax contains decimal -2 and BX contains decimal 2 then after the execution of instructions: CMP AX, BX ,JA label (1 marks)

1. Jump will be taken
2. Zero flag will set
3. ZF will contain value -4
4. Jump will not be taken (rr)

Correct answer: Jump will not be taken (rr)

Q9. If D is “35” is shift to left 2 bits the new value (1 marks)

1. 35
2. 70
3. 140
4. 17

Q10. When two 16bit numbers are added the answer can be 17 bits long, this extra bit that won’t fit in the target register is placed in the where it can be used and tested (1 marks)

1. carry flag (Page 16)
2. Parity Flag
3. Auxiliary Carry
4. Zero Flag

Correct answer: carry flag (Page 16)

Q11. Only instructions allow moving data from memory to memory. (1 marks)

1. string (Page 29)
2. word
3. indirect
4. stack

Correct answer: string (Page 29)

Q12. When a 16 bit number is divided by an 8 bit number, the quotient will be in (1 marks)

1. AL (Page 85)
2. AX
3. AH
4. DX

Correct answer: AL (Page 85)

Q13. Which bit of the attributes byte represents the red component of background color ? (1 marks)

1. 3
2. 4
3. 5
4. 6 (Page 81)

Correct answer: 6 (Page 81)

Q14. | 0 |--›| 1 | 1 | 0 | 1 | 0 | 0 | 0 | --›| C | is a example of ______ (1 marks)

1. Shl
2. sar
3. Shr (Page 52)
4. Sal

Correct answer: Shr (Page 52)

Q15. allow changing specific processor behaviors and are used to play with it. (1 marks)

1. Special Instructions (Page 14)
2. Data Movement Instructions
3. Program Control Instructions
4. Arithmetic and Logic Instructions

Correct answer: Special Instructions (Page 14)