Embedded MCQ Questions

1.    A micro controller at-least should consist of:
a) RAM, ROM, I/O devices, serial and parallel ports and timers
b) CPU, RAM, I/O devices, serial and parallel ports and timers
c) CPU,RAM, ROM, I/O devices, serial and parallel ports and timers
d) CPU, ROM, I/O devices and timers

2.        Unlike micro processors, micro controllers make use of batteries because they have:
a) high power dissipation
b) low power consumption
c) low voltage consumption
d) low current consumption

3.        What is the order decided by a processor or the CPU of a controller to execute an instruction?
a) decode,fetch,execute
b) execute,fetch,decode
c) fetch,execute,decode
d) fetch,decode,execute

4.       How are micro controllers classified on the basic of internal bus width?
a) 8,16,32,64 bits
b) 4,8,16,32 bits
c) 8,16 bits
d) 4,16,32 bits

5.       How is the performance and the computer capability affected by increasing its internal bus width?
a) it increases and turns better
b) it decreases
c) remains the same
d) internal bus width don’t affect the performance in any way

6.        Abbreviate CISC and RISC.
a) Complete Instruction Set Computer, Reduced Instruction Set Computer
b) Complex Instruction Set Computer, Reduced Instruction Set Computer
c) Complex Instruction Set Computer, Reliable Instruction Set Computer
d) Complete Instruction Set Computer, Reliable Instruction Set Computer

7.       Give the names of the buses present in a controller for transferring data from one place to another?
a) data bus, address bus
b) data bus
c) data bus, address bus, control bus
d) address bus

8.       What is the file extension that is loaded in a micro controller for executing any instruction?
a) .doc
b) .c
c) .txt
d) .hex

9.       What are the most appropriate criterion for choosing the right micro controller of our choice?
a) speed
b) availability
c) ease with the product
d) all of the mentioned

10.   Why micro controllers are not called general purpose devices?
a) because they are based on VLSI technology
b) because they are not meant to do a single work at a time
c) because they are cheap
d) because they consume low power

11.   How many types of architectures are available, for designing a device that is able to work on its own?
a) 3
b) 2
c) 1
d) 4

12.   Which architecture is followed by general purpose microprocessors?
a) Harvard architecture
b) Von Neumann architecture
c) none of the mentioned
d) all of the mentioned

13.    Which architecture involves both the volatile and the non volatile memory?
a) Harvard architecture
b) Von Neumann architecture
c) none of the mentioned
d) all of the mentioned

14.   Which architecture provides separate buses for program and data memory?
a) Harvard architecture
b) Von Neumann architecture
c) none of the mentioned
d) all of the mentioned

15.   Which micro controller don’t match with its architecture below?
a) Microchip PIC- Harvard
b) MSP430- Harvard
c) ARM7- Von Neumann
d) ARM9- Harvard

16.    Harvard architecture allows:
a) separate program and data memory
b) pipe-ling
c) complex architecture
d) all of the mentioned

17.   Which out of the following supports Harvard architecture?
a) ARM7
b) Pentium
c) SHARC
d) all of the mentioned

18.    Why most of the DSPs use Harvard architecture?
a) they provide greater bandwidth
b) they provide more predictable bandwidth
c) none of the mentioned
d) both of the mentioned

19.   Which of the following supports CISC as well as Harvard architecture?
a) ARM7
b) ARM9
c) SHARC
d) none of the mentioned

20.   n Neumann
c) none of the mentioned
d) both of the mentioned

21.   . 8051 series of micro controllers are made by which of the following companies?
a) Atmel
b) Philips
c) none of the mentioned
d) both of the mentioned

22.   AT89C2051 has RAM of:
a) 128 bytes
b) 256 bytes
c) 64 bytes
d) 512 bytes

23.    8051 series has how many 16 bit registers?
a) 2
b) 3
c) 1
d) 0

24.   When 8051 wakes up then 0x00 is loaded to which register?
a) DPTR
b) SP
c) PC
d) PSW

25.    When the micro controller executes some arithmetic operations, then the flag bits of which register are affected?
a) PSW
b) SP
c) DPTR
d) PC

26.   How is the status of the carry, auxiliary carry and parity flag affected if write instruction
MOV A,#9C
ADD A,#64H
a) CY=0,AC=0,P=0
b) CY=1,AC=1,P=0
c) CY=0,AC=1,P=0
d) CY=1,AC=1,P=1

27.    How are the bits of the register PSW affected if we select Bank2 of 8051?
a) PSW.5=0 and PSW.4=1
b) PSW.2=0 and PSW.3=1
c) PSW.3=1 and PSW.4=1
d) PSW.3=0 and PSW.4=1

28.   If we push data onto the stack then the stack pointer
a) increases with every push
b) decreases with every push
c) none of the mentioned
d) both of the mentioned

29.   On power up, the 8051 uses which RAM locations for register R0- R7
a) 00-2F
b) 00-07
c) 00-7F
d) 00-0F

30.   How many bytes of bit addressable memory is present in 8051 based micro controllers?
a) 8 bytes
b) 32 bytes
c) 16 bytes
d) 128 bytes

31.   DJNZ R0,label is how many bit instruction?
a) 2
b) 3
c) 1
d) Cant be determined

32.   JZ, JNZ, DJNZ, JC, JNC instructions monitor the bits of which register ?
a) DPTR
b) B
c) A
d) PSW

33.  Calculate the jump code for again and here if code starts at 0000H

34. MOV R1,#0

35. MOV A,#0

36. MOV R0,#25H

37. AGAIN:ADD A,#0ECH

38. JNC HERE

39. HERE: INC R1

40. DJNZ R0,AGAIN

41. MOV R0,A

42. END

43. a)F3,02
b)F9,01
c)E9,01
d)E3,02

44.   When the call instruction is executed the top most element of stack comes out to be
a) the address where stack pointer starts
b) the address next to the call instruction
c) address of the call instruction
d) next address of the stack pointer

45.   LCALL instruction takes
a) 2 bytes
b) 4 bytes
c) 3 bytes
d) 1 byte

46.   Are PUSH and POP instructions are a type of CALL instructions?
a) yes
b) no
c) none of the mentioned
d) cant be determined

47.   What is the time taken by one machine cycle if crystal frequency is 20MHz?
a) 1.085 micro seconds
b) 0.60 micro seconds
c) 0.75 micro seconds
d) 1 micro seconds

48. Find the number of times the following loop will be executed

MOV R6,#200

BACK:MOV R5,#100

HERE:DJNZ R5, HERE

DJNZ R6,BACK

END

a)100
b)200
c)20000
d)200000