Term Test

Question 1

Which is not part of the execution unit (EU)?

A. Arithmetic logic unit (ALU)
B. Clock
C. General registers
D. Flags

Answer 1

Clock

Question 2

A 20-bit address bus can locate ________.

A. 1,048,576 locations
B. 2,097,152 locations
C. 4,194,304 locations
D. 8,388,608 locations

Answer 2

1,048,576 locations

Question 3

Which group of instruction does not affect flag register after execution?
A. Arithmetic operations
B. Logical operations
C. Data transfer operations
D. Branch operations

Answer 3

Data transfer operations

Question 4

The result of MOV AL, 65 is to store ---------- data in AL.
A. store 0100 0010 in AL
B. store 42H in AL
C. store 40H in AL
D. store 0100 0001 in AL

Answer 4

store 0100 0001 in AL

Question 5

What is a microprocessor?

Answer 5

A microprocessor is a multipurpose, programmable logic device that reads binary instructions from
a storage device called memory accepts binary data as input and processes data according to those
instructions and provides results as output.

Question 6

If you connect 5V supply to “No voltage ” point then what about output Y?

Answer 6

Point Y which is a No Voltage point will become +5V

Question 7

IDIV and DIV instructions perform the same operations for?

a) Unsigned number
b) Signed number
c) Signed number & Unsigned number
d) none of the above.

Answer 7

Signed number

Question 8

What is the output of the following code
AL=88 BCD,
CL=49 BCD
ADD AL, CL
DAA

a) D7, CF=1
b) 37, CF=1
c) 73, CF=1
d) 7D, CF=1

Answer 8

37, CF=1

Question 9

Which signal (pin) belongs to the 8087 coprocessor?

Answer 9

TEST

Question 10

What is the output of the following code
SI=10010011 10101101, CF=0
SHR SI, 1

a) 37805, CF=1, OF=1
b) 18902, CF=1, OF=1
c) 19820, CF=1, OF=1
d) 53708, CF=1, OF=1

Answer 10

18902, CF=1, OF=1

Question 11

What is the output of the following code
BX=23763 CL=8
ROL BX, CL

a) 0101110011010011, CF=0
b) 1101001101011100, CF=0
c) 0110100010011101, CF=1
d) 1011100110001100, CF=1

Answer 11

b) 1101001101011100, CF=0

Question 12

What is the output of the following code PUSH AL?

a) Decrement SP by 2 & push a word to stack
b) Increment SP by 2 & push a word to stack
c) Decrement SP by 2 & push an AL to stack
d) Illegal

Answer 12

Illegal

Question 13

What is the output of the following code
AX = 37D7H, BH = 34H
DIV BH

a) AL = 65H, AH= 94 decimal
b) AL= 5EH, AH= 101 decimal
c) AH= E5H, AL= 5EH
d) AL= 56H, AH= 5EH

Answer 13

AL= 5EH, AH= 101 decimal

Question 14

BHE of 8086 microprocessor signal is used to interface the————

a. Even bank memory
b. Odd bank memory
c. I/o
d. Dma

Answer 14

Odd bank memory

Question 15

In 8086 microprocessors the following has the highest priority among all type of interrupts.

a) NMI
b) DIV 0
c) TYPE 255
d) OVER FLOW

Answer 15

NMI (non maskable interrupt)

Question 16

Which register is used as loop counter in 8086 microprocessor?
A. AX
B. BX
C. CX
D. DX

Answer 16

CX

Question 17

Which of the following is not present in BIU unit?
A. iNSTRUCTION QUEUE
B. Segment register
C. Instruction pointer
D. Flag register

Answer 17

Flag register

Question 18

Which of following address lines are multiplexed with status signals?
A. A19 – A15. 
B. A19 – A16. 
C. A14 – A11
D. A3 – A0

Answer 18

A19 – A16

Question 19

Calculate physical address for given segment offset pair 7213: 5686
A. 0C899h
B. 777B6h
C. 776B6h
D. 777B9h

Answer 19

777B6h

Question 20

Instruction queue size of 8086 microprocessor is?
A. 4 bytes
B. 6 bytes
C. 10 bytes
D. 2 bytes

Answer 20

6 bytes

Question 21

Co processor can be attached in which mode?
A. Minimum mode
B. Maximum mode
C. Minimum mode and Maximum mode
D. No mode

Answer 21

Maximum mode

Question 22

The action performed by MOV [1234H], AX
A. Moves content of memory location 1234h to AX register
B. Moves content of AX register to memory offset 1234h
C. Add contents at 1234h and AX
D. Add contents of 1234h and AX and store the result in 1234h

Answer 22

Moves content of AX register to memory offset 1234h

Question 23

The -------is used to connect more microprocessor.
A. peripheral device
B. cascade
C. I/O devices
D. control unit

Answer 23

cascade

Question 24

In which year 8086 was introduced?
A. 1978
B. 1979
C. 1977
D. 1981

Answer 24

1978

Question 25

What is the output of the following code
CF =0, BH = 179
RCL BH, 1

a) CF=0, OF= 1, BH= 01100101
b) CF=1, OF=1, BH=01100110
c) CF=1, OF =0, BH= 01001101
d) CF=0, OF=0, BH=00101100

Answer 25

b) CF=1, OF=1, BH=01100110

Question 26

The WAIT instruction check which pin in 8086?
A. TEST
B. BHE
C. DEN 
D. HOLD

Answer 26

TEST

Question 27

In MOVS instruction of 8086 the segment register of destination is-----------
A. CS
B. DS
C. ES
D. SS

Answer 27

ES

Question 28

In 8086, data access by which register uses SS by default segment register
A. SP
B. BP
C. Both SP and BP
D. DI

Answer 28

Both SP and BP

Question 29

Which of following statement is correct?
A. If MN/MX’ is low, 8086 cannot be associated with any co-processor.
B. If MN/MX’ is low, 8086 can be associated with any co-processor.
C. If MN/MX’ is low, 8086 is in Maximum Mode.
D. If MN/MX’ is high, 8086 is in Minimum Mode.

Answer 29

If MN/MX’ is low, 8086 cannot be associated with any co-processor.

Question 30

How many 16 bits segment register does 8086 have?

Answer 30

8

AX, BX, CX, DX, SI, DI, BP, SP

Question 31

What is the output of the following code
AL=00110101 BL= 39H
SUB AL, BL
AAS

a) AL= 00000100, CF=1
b) BL=00000100, CF=0
c) AL=11111100 CF=1
d) BL=00000100, CF=1

Answer 31

a) AL= 00000100, CF=1