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MCQs on COMPUTER ARCHITECURE DIGITAL ELECTRONICS MICROPROCESSORS FOR PLACEMENT TRAINING

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Title: MCQs on COMPUTER ARCHITECURE DIGITAL ELECTRONICS MICROPROCESSORS FOR PLACEMENT TRAINING

1
MCQs onCOMPUTER ARCHITECUREDIGITAL
ELECTRONICSMICROPROCESSORSFOR PLACEMENT
TRAINING

By
SHWETA VINCENT
AP (CSE)

2
YOU!!!!
3
EMPLOYER...!!!!
4
ON A LIGHTER NOTE..D
5
FORMAT

QUESTION ON FIRST SLIDE
ANSWER ON THE NEXT SLIDE

1. Where does a computer add and compare data?
a. Hard disk
b. Floppy disk
c. CPU chip
d. Memory chip

2. Which of the following registers is used to
keep track of address of the memory location
where the next instruction is located?
a. Memory Address Register
b. Memory Data Register
c. Instruction Register
d. Program Register

3. A complete microcomputer system consists of
a. microprocessor
b. memory
c. peripheral equipment
d. all of above

4. CPU does not perform the operation
a. data transfer
b. logic operation
c. arithmetic operation
d. all of above

5. Pipelining strategy is called to implement
a. instruction execution
b. instruction prefetch
c. instruction decoding
d. instruction manipulation

6. A stack is
a. an 8-bit register in the microprocessor
b. a 16-bit register in the microprocessor
c. a set of memory locations in R/WM reserved for
storing information temporarily during the
execution of computer
d. a 16-bit memory address stored in the program
counter

7. A stack pointer is
a. a 16-bit register in the microprocessor that
indicate the beginning of the stack memory.
b. a register that decodes and executes 16-bit
arithmetic expression.
c. The first memory location where a subroutine
address is stored.
d. a register in which flag bits are stored

8. The branch logic that provides decision making
capabilities in the control unit is known as
a. controlled transfer
b. conditional transfer
c. unconditional transfer
d. none of above

9. Interrupts which are initiated by an
instruction are
a. internal
b. external
c. hardware
d. software

10. A time sharing system implies
a. more than one processor in the system
b. more than one program in memory
c. more than one memory in the system
d. None of above

11. Processors of all computers, whether micro,
mini or mainframe must have
a. ALU
b. Primary Storage
c. Control unit
d. All of above

12. What is the control unit's function in the
CPU?
a. To transfer data to primary storage
b. to store program instruction
c. to perform logic operations
d. to decode program instruction

13. What is meant by a dedicated computer?
a. which is used by one person only
b. which is assigned to one and only one task
c. which does one kind of software
d. which is meant for application software only

14. The most common addressing techiniques
employed by a CPU is
a. immediate
b. direct
c. indirect
d. register
e. all of the above

15. Pipeline implements
a. fetch instruction
b. decode instruction
c. fetch operand
d. calculate operand
e. execute instruction
f. all of above

16. Which of the following code is used in
present day computing was developed by IBM
corporation?
a. ASCII
b. Hollerith Code
c. Baudot code
d. EBCDIC code

17. When a subroutine is called, the address of
the instruction following the CALL instructions
stored in/on the
a. stack pointer
b. accumulator
c. program counter
d. stack

18. A microprogram written as string of 0's and
1's is a
a. symbolic microinstruction
b. binary microinstruction
c. symbolic microprogram
d. binary microprogram

19. Interrupts which are initiated by an
instruction are
a. internal
b. external
c. hardware
d. software

20. Memory access in RISC architecture is limited
to instructions
a. CALL and RET
b. PUSH and POP
c. STA and LDA
d. MOV and JMP

21. A collection of 8 bits is called
a. byte
b. word
c. record

22. The ascending order or a data Hierarchy is
a. bit - bytes - fields - record - file -
database
b. bit - bytes - record - field - file - database
c. bytes - bit- field - record - file - database
d. bytes -bit - record - field - file - database

23. How many address lines are needed to address
each memory locations in a 2048 x 4 memory chip?
a. 10
b. 11
c. 8
d. 12

24. A computer program that converts an entire
program into machine language at one time is
called a/an
a. interpreter
b. simulator
c. compiler
d. commander

25. In immediate addressing the operand is placed
a. in the CPU register
b. after OP code in the instruction
c. in memory
d. in stack

26. Microprocessor 8085 can address location
upto
a. 32K
b. 128K
c. 64K
d. 1M

27. The ALU and control unit of most of the
microcomputers are combined and manufactured on a
single silicon chip. What is it called?
a. monochip
b. microprocessor
c. ALU
d. control unit

28. When the RET instruction at the end of
subroutine is executed,
a. the information where the stack is
iniatialized is transferred to the stack pointer
b. the memory address of the RET instruction is
transferred to the program counter
c. two data bytes stored in the top two locations
of the stack are transferred to the program
counter
d. two data bytes stored in the top two locations
of the stack are transferred to the stack pointer

29. A microporgram in sequence performs the
operation
a. read
b. write
c. execute
d. read and write
e. read and execute

30. Interrupts which are initiated by an I/O
drive are
a. internal
b. external
c. software
d. all of above

31. From where interrupts are generated?
a)Central processing unit
b) Memory chips
c) Registers
d) I/O devices

32. The output of a gate is low when at least one
of its input is low . It is true for
a)AND gate
b) OR gate
c) NAND gate
d) NOR gate

33. Which one of the following is most suitable
to make a parity checker
AND gate
OR gate
Exclusive- OR gate
None of the above

34. What is the minimum number of flip-flops
required in a counter to count 100 pulses?
a)Five
b) seven
c) Ten
d) hundred

35. For a RS flip-flop constructed with NAND
gates and input R1 and S1 the state is
a) Memory state
b) Set state
c) Reset state
d) Unused state

36. The advantage of RISC processor over CISC
processor is that
a) The hardware architecture is simpler
b) An instruction can be executed in one cycle
c) Less number of registers accommodate in chip
d) Parallel execution capabilities

37. Which of the following is true about
interrupts?
a) They are generated when memory cycles are
stolen
b) They are used in place of data channels
c) They can be generated by arithmetic operation
d) They can indicate completion of an I/O
operation

38. The devices connected to a microprocessor can
use the data bus
a) all the time
b) at regular interval of time
c) only when its sending or receiving data
d) when the microprocessor is reset

39. Intel 8080 microprocessor has an instruction
set of 91 instruction . The opcode to implement
this instruction set should be at least
a)3 bit long
b) 5 bit long
c) 7 bit long
d) 9 bit long

40. Dynamic RAMs are best suited to
(a) slow system
(b) large system
(c) one bit system
(d) none of the above

41. Intel Pentium CPU is a
a. RISC based
b. CISC based
c. Both of the above
d. None of the above

42. A modem is used to link up two computers via
a. telephone line
b. dedicated line
c. Both of the above
d. None of the above

43. The maximum integers which can be stored on
a 8 bit accumulator is
a. 112
b. 200
c. 255
d. 224

44. In a system with a 16 bit address bus, what
is the maximum number of 1K byte memory devices
it could contain
16
64
256
65536

45. Which of the following memories in a computer
is volatile?
a. RAM
b. ROM
c. EPROM
d. ALL

46. A peripheral is
a. any drives installed in the computer
b. tapedrive connected to a computer
c. any physical device connected to the
computer
d. None of above

47. Which of the following bus is used to
transfer data from main memory to peripheral
device?
a. DMA bus
b. Output bus
c. Data bus
d. All of the above

100

48. To provide increased memory capacity for
operating system, the
a. virtual memory is created
b. cache memory is increased
c. memory for OS is reserved
d. Additional memory is installed

101

102

49. Which of the following require large computer
memory?
a. Imaging
b. Graphics
c. Voice
d. All of the above

103

104

50. Which major development led to the production
of microcomputers?
a. Magnetic disks
b. floppy disks
c. Logic gates
d. Integrated Circuits

105

106

51. In immediate addressing the operand is placed
a. in the CPU register
b. after opcode in the instruction
c. in the memory
d. in the stack

107

108

52. Micro instructions are stored in
a. computer memory
b. primary storage
c. secondary storage
d. control memory
e. cache memory

109

110

53. Pipeline processing implements
a. fetch instruction
b. decode instruction
c. fetch operand
d. calculate operand
e. execute instruction
f. all of the above

111

112

54. The 16- bit registers in 8085 is
a. general purpose register
b. accumulator
c. stack pointer and program counter
d. all of the above

113

114

55. Instruction pipelining has minimum stages
a. 4
b. 2
c. 3
d. 6

115

116

56. Systems that do not have parallel processing
capabilities are
a. SISD
b. SIMD
c. MIMD
d. All of the above

117

118

57. The word size of the microprocessor refers to
a. the amount of a information that can be stored
in a byte
b. the amount of a information that can be stored
in a cycle
c. The number of machine operations performed in
a second
d. the maximum length of an English word that can
be input to a computer

119

120

58. The voltage levels for a negative logic
system
(a) must necessarily be negative
(b) could be negative or positive
(c) must necessarily be positive
(d) must necessarily be either zero or -5 V

121

122

59. The output Qn of a J-K flip-flop is zero. It
changes to 1 when a clock pulse is applied, the
inputs Jn and Kn are respectively
(a) 1 and X
(b) 0 and X
(c) X and 0
(d) X and 1

123

124

60. The larger the RAM of a computer, the faster
is its speed, since it eliminates
(a) need for ROM
(b) need for external memory
(c) frequency disk I/O s
(d) need for a data-wide path

125

126

61. The number of bits needed to address 4K
memory is
(a)6
(b) 8
(c)12
(d) 16

127

128

62. The ESC instruction of 8086 may have two
formats. In one of the formats, no memory operand
is used. Under this format, the number of
external op-codes (for the co-processor) which
can be specified is?
(a) 64
(b) 128
(c) 256
(d) 512

129

130

63. The TRAP is one of the interrupts available
its INTEL 8085. Which one of the following
statements is true of TRAP?
(a) It is level triggered
(b) It is negative edge triggered
(c) It is positive edge triggered
(d) It is both positive edge triggered and level
triggered

131

132

64. In a 16-bit microprocessor, words are stored
in two consecutive memory locations. The entire
word can be read in one operation provided the
first
(a) word is even
(b) word is odd
(c) memory location is odd
(d) memory address is even

133

134

65. A 3 x 8 decoder with two enable inputs is to
be used to address 8 blocks of memory. What will
be the size of each memory block when addressed
from a sixteen bit bus with two MSBs used to
enable the decoder
(a) 2K
(b) 4K
(c)16K
(d) 64K

135

136

66. A decade counter requires
(a) 10 flip-flops
(b) 4 flip-flops
(c) 3 flip-flops
(d) 2 flip-flops.

137

138

67. The decimal value for the BCD coded number
00010010 is
(a) 6
(b) 10
(c)12
(d)18.

139

140

68. An adder takes. Input/s and produces.
Output/s
(a) one, two
(b) two, two
(c) three, two
(d) two, three.

141

142

69. Which of the following combinations of gates
does not allow the implementation
of an arbitrary Boolean function?
(a) OR gates and inverters only
(b) NAND gates only
(c) OR gates and exclusive OR gates only
(d) OR gates and NAND gates.

143

144

70. Which logic circuit is the fastest?
(a) TTL
(b) DTL
(c) RTL
(d) All have same speed.

145

146

71. A half adder has
(a) 2 inputs and 2 outputs
(b) 2 inputs and 3 outputs
(c) 3 inputs and 3 outputs
(d) None of the above.

147

148

72. The main advantage of flip-flops over
transistor circuit is
(a) immunity from noise
(b) low heating
(c) low propagation delay time
(d) high propagation.

149

150
EXTERNAL LINKS FOR STUDY

http//www.indiabix.com/digital-electronics/microp
rocessor-fundamentals/
http//www.jbigdeal.com/microprocessor-question-an
swers
http//www.psexam.com/MCQ-Collection-for-Fundament
als-of-Computer/computer-fundamentals-objective-qu
estions-mcq-with-solutions-set-20.html
http//mcqquestion.blogspot.in/2012/08/computer-sy
stem-architecture_20.html
http//www.indiabix.com/digital-electronics/logic-
gates/