MCQ – Computer Architecture – Set I

1. From where interrupts are generated?
a)Central processing unit                     b) Memory chips
c) Registers                                          d) I/O devices
Ans: d
2. 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
Ans: A
3. Which one of the following is most suitable to make a parity checker
a) AND gate                                       b) OR gate
c) Exclusive- OR gate                        d) None of the above
Ans: C
4What is the minimum number of flip-flops required in a counter to count 100 pulses?
a)Five                                                     b) seven
c) Ten                                                     d) hundred
Ans: b
5. For a RS flip-flop constructed with NAND gates and input R=1 and s=1 the state is
a) Memory state                                  b) Set state
c) Reset state                                       d) Unused state
Ans: D
6. 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
Ans: b
7. 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
Ans: A
8. Te devices connected to a microprocessor can use the data bus:
a) all the time
b) at regular interval of time
c) only when it’s sending or receiving data
d) when the microprocessor is reset
Ans: c
9.  Intel 8080 microprocessor has an instruction set of 91 instruction . The  opcode to implement this instruction set should  be at least
a3 bit long
b) 5 bit long
c) 7 bit long
d) 9 bit long
Ans: c
10. Dynamic RAMs are best suited to
(a) slow system
(b) large system
(c) one bit system
(d) none of the above
Ans: a

1. Intel Pentium CPU is a

• RISC based   **
• CISC based
• Both of the above
• None of the above

2. A modem is used to link up two computers via

• telephone line
• dedicated line
• Both of the above  **
• None of the above

3. The maximum integer which can be stored on  a 8 bit accumulator is

• 112
• 200
• 255  **
• 224

4. 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

5. Which of the following memories in a computer is volatile?

• RAM  **
• ROM
• EPROM
• ALL

6.  A peripheral is

• any drives installed in the computer
• tapedrive connected to a computer
• any physical device connected  to the computer  **
• None of above

7.  How many bits do you think will be adequate to encode individual character in Devnagari script

• 12
• 16
• 64
• 10  **

8. Which of the following bus is used to transfer data from main memory to peripheral device?

• DMA bus
• Output bus
• Data bus  **
• All of the above

9. To provide increased memory capacity for operating system, the

• virtual memory is created  **
• cache memory is increased
• memory for OS is reserved
• Additional memory is installed

10. CD -RAW is

• Input device only
• output device only  **
• Both of the above
• None of the above

11. Which of the following require large computer memory?

• Imaging
• Graphics
• Voice
• All of the above   **

12. Which major development led to the production of microcomputers?

• Magnetic disks
• floppy disks
• Logic gates
• Integrated Circuits  **

13. In immediate addressing the operand is placed

• in the CPU register
• after opcode in the instruction  **
• in the memory
• in the stack

14. Micro instructions are stored in

• computer memory
• primary storage
• secondary storage
• control memory  **
• cache memory

15. Pipeline processing implement

• fetch instruction
• decode instruction
• fetch operand
• calculate operand
• execute instruction
• all of the above  **

16. The 16- bit registers in 8085 is

• general purpose register
• accumulator
• stack pointer and program counter  **
• all of the above

17. Instruction pipelining has minimum stages

• 4
• 2  **
• 3
• 6

18. Systems that do not have parallel processing capabilities are

• SISD  **
• SIMD
• MIMD
• All of the above

19. The word size of the microprocessor refers to

• the amount of a information that can be stored in a byte
• the amount of a information that can be stored in a cycle  **
• The number of machine operations performed in a second
• the maximum length of an English word that can be input to a computer

20. How many address lines are needed to address each memory location in a 2048X 4 memory chip?

• 10
• 11  **
• 8
• 12