vector india sample paper entrance exam solution paper

Micro Processor: 8085

Q. The 8085 microprocessor is an ___-bit microprocessor. It is a _____ pin IC.

1. 8 , 20
2. 16 , 40 
3. 16 , 20  
4. 8 , 40

Ans-> d) 8 , 40

 

Q. The following are true about 8085 except that, ______.

1. It is manufactured by using NMOS technology
2.  It is having on-chip clock generation facility
3. It has 8 address lines
4. The lower order address bus is multiplexed with data bus

Ans-> b) It is having on-chip clock generation facility

 

Q. The status register or flag register of 8085 includes ______ flags.

1. 3       
2. 5         
3. 7             
4. 9

Ans-> b) 5   

 

Q. The data conditions, after execution of arithmetic or logical operations are indicated by setting or resetting the ___________ called flags.

1. Flip-flops       
2. latches         
3. registers         
4. gates

Ans-> a) Flip-flops

 

Q. Address Latche Enable(ALE) signal is used to de-multiplex ________ and _________ buses.

1. Address, data
2. Address, control
3. Data, control       
4. None of the above

 

Q. SID and SOD signals are used _______________.

1. For Serial communication       
2. For DMA operation
3. By slow operating peripherals   
4. None of the above

 

Q. In the 8085, the machine cycle may consists of _______ to _______ T-states.

1. 2, 4         
2. 3,6       
3. 2,8         
4. 3,8

Ans-> b) 3,6

 

Q. The 8085 instruction cycle consists of one to five machine cycles.The first machine cycle of each instruction cycle is always _____________ machine cycle.

1.  I/O read     
2. I/O write     
3. Memory read     
4. None of the above

Ans-> d) None of the above

39. The ______ instruction is Machine control instruction.

1. HLT   
2.  PUSH     
3. IN     
4. LDA

Ans-> a) HLT   

 

Q. The number of ways in which the operand information is specficied in the instruction code are ______.

1. 4       
2. 5       
3. 12       
4. 24

Q. The data bus of any microprocessor is always

1. Unidirectional   
2. Bi-directional       
3. Either unidirectional or bi-directional
4. None of the above

Ans-> b) Bi-directional   

Q. In a microprocessor-based system, the stack is always in

1. Microprocessor   
2. RAM   
3. ROM     
4. EPROM

Ans:- b) RAM

 

43. In 8085 microprocessor,the I/O devices can be used in

1. Memory-mapped I/O only     
2. I/O mapped I/O only 
3. Memory-mapped I/O or I/O mapped I/O   
4. None of the above

Ans-> c) Memory-mapped I/O or I/O mapped I/O   

Q. In 8085 microprocessor,in response to RST 7.5 interrupt the execution is transferred to memory location.

1. 0000H   
2.  002CH     
3. 0034h     
4. 003CH

Ans-> d) 003CH

Q. Which of the data transfer is not possible in 8085 microprocessor?

1. Memory to accumulator     
2. Accumulator to memory
3. Memory to memory           
4. I/O device to accumulator

Ans-> c) Memory to memory   

Q. _________type of ADC is the fastest type of ADC.

1. Flash   
2. Counter 
3.  Dual slope 
4.  Successive approximation

Ans-> a) Flash 

Q. The number of comparators in a 4-bit flash type ADC is ________ .

1. 4       
2. 5         
3. 15         
4. 16

Ans-> c) 15

 

Q. An ADC is usually considered as an _________.

1. Encoder     
2. Decoder     
3. Tri-State Logic       
4. None of the mentioned

Ans-> a) Encoder  

Q. The resolution of a 4 bit counting ADC is 0.5 volts. For an analog input of 6.6 volts,the digital output of the ADC will be _______ .

1. 1011       
2. 1101     
3. 1100       
4. 1110

Ans-> b). 1101 

Q. There are _____ types of DAC’s avaible.

1. 2         
2. 3       
3. 4         
4. 5

Ans-> a) 2

 

Micro Processor:8086

Q. What is the maximum clock frequency in 8086?

1. 4MHz     
2. 5MHz     
3. 6MHz     
4. 7MHz

Ans-> 5MHz

Q. Size of the IP reg in 8086 is------

1. 8 bits       
2. 16 bits       
3. 20 bits       
4. 24 bits

Ans-> b). 6bits

Q. ------register can be changed directly using POP instruction

1.  ss         
2. es         
3. ds         
4. cs

Ans-> a). ss

Q. SIM is-------------------

1. serial interrupt mask.   
2. set interrupt
3. set interrupt mask   
4. serial interrupt monitor

Ans->c).set interrupt mask   

 

35. What is the size of the instruction queue?

1. 4 bytes       
2. 6 bytes       
3. bytes     
4. 2 bytes

Ans->b). 6 byte

Q. What is the size of each segment in 8086?

1. 12kb     
2. 32kb       
3. 64kb       
4. 128kb

Ans-> c) 64kb

Q. Which micro processor accepts the program written for 8086 with out any changes

1. 8085       
2. 8087       
3. 8088           
4. 80286

Ans-> c) 8088

Q. Which are the basic parts of 8086?

1. BIU       
2. EU         
3. pipelining     
4. a and b

Ans->a).BIU

Q. 8086 is -------bit microprocessor?

1. 8       
2. 16         
3. 20       
4. 24

Ans-> b).16 bit

 

Q. Among all which one is co –processor for 8086?

1. 8085     
2. 8087       
3. 8088       
4. 80286

Ans->b) 8087

Q. How many general-purpose registers are available in 8086?

1. 4     
2. 8       
3. 10       
4. none

Q. -----------------reg (in 8086)contains the address of the next instruction to be fetched?

1. bp     
2. sp       
3. pc         
4. ip

Ans-> d) IP

Q. Which Segment is used to store interrupt and subroutine return address registers.

1. ss           
2. es           
3. ds           
4. cs

Ans-> a) ss

Q. Which Flag can be set or reset by the programmer and also used to control the operation of the processor?

1. trace     
2. interrupt     
3. direction       
4. all

Ans-> c). direction  

 

Q. Give example of maskable interrupt?

1.  RST 7.5   
2. RST 6.5     
3. TRAP     
4. a and b

Ans-> a) RST 7.5

 

Q. MOV Cx, 1234H instruction belongs to which addressing mode ?

1. Register     
2. memory       
3. direct           
4. Immediate

Ans-> a) Register  

 

Q. 8086 instructions varied from ----------- to ---------- bytes ?

1. 1 to 2 bytes     
2. 1 to 3 bytes       
3. 1 to 4 bytes         
4. none

Ans-> d) None

 

Q. 8086 prefetches only when at least ------------ bytes are free in queue.

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

Ans-> a) 4       

Q. An RS-232 interface is  

1. parallel interface   
2. a serial interface   
3. printer interface   
4. a modem interface

Ans-> b) a serial interface   

Q. 8086 has -------------- flag signals.

1.  3             
2. 5             
3. 7             
4. 9

Ans-> b) 5