Computer system architecture MCQ Computer Science

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About Computer system architecture

Following are some of the multiple choice questions on the Computer system architecture with answers that will help the students in developing their knowledge.

Computer system architecture MCQ

1. A floating point number that has a O in the MSB of mantissa is said to have

  • overflow
  • underflow
  • important number
  • undefined

2. Multiprogramming of the computer system increases

  • a.memory
  • b. storage
  • c.CPU utilization
  • d.cost

3. When the CPU decodes and executes an instruction and then repeats. This is called the..

  • Fetch-decode-execute cycle
  • Decode-execute-fetch- cycle
  • Execute-decode-fetch- cycle
  • Execute-fetch-process-cycle

4. An address in main memory is called

  • physical address
  • logical address
  • memory address
  • word address

5. The Control Unit

  • Controls the flow of data around the CPU and also decodes instructions
  • Only controls the flow of data around the CPU
  • Controls how much power is directed to all components within the computer
  • Only decodes instructions

6. A device/circuit that goes through a predefined sequence of states upon the application of input pulses is called

  • register
  • flip-flop
  • transistor.
  • counter.

7. Which statement best describes RAM?

  • Fast, permanent storage
  • Fast, volatile storage
  • Slow, volatile storage
  • Slow, permanent storage

8. Cache memory works on the principle of

  • locality of data
  • locality of memory
  • locality of reference
  • locality of reference & memory

9. What characteristic of RAM memory makes it not suitable for permanent storage?

  • too slow
  • unreliable
  • it is volatile
  • too bulky

10. Which of the following memories must be refreshed many times per second?

  • (A) EPROM
  • (B)ROM
  • (C)Static RAM
  • (D)Dynamic RAM

11. In computers, subtraction is generally carried out by

  • 9’s complement
  • 10’s complement
  • 1’s complement
  • 2’s complement

12. Generally Dynamic RAM is used as main memory in a computer system as it

  • consumes less power
  • has higher speed
  • has lower cell density
  • needs refreshing circuitary

13. What are the two main architectural models that use the stored-program model?

  • Processing Architecture
  • Storage Architecture
  • Harvard Architecture
  • Von Neumann Architecture
  • Desktop Architecture

14. MRI indicates

  • memory reference information.
  • memory reference instruction.
  • memory registers instruction.
  • memory register information

15. What is the purpose of Cache?

  • Performs Arithmetic and Logical operations
  • Decodes and directs instructions to be carried out
  • Processes graphical functions
  • Stores frequently used data and instructions

16. The main memory of the computer system is also called

  • a.non volatile
  • b. volatile
  • c.CPU utilization
  • d.cost

17. What is the full meaning of SIMD?

  • Single Instruction Multiple Data
  • Small Instruction Multiple Data
  • Single Instruction Multiplexing Data
  • Single Instruction Multiple Digits

18. What computer architecture simultaneously reads or writes data from the data memory

  • Von Neumann Architecture
  • PC Architecture
  • Storage processing Architecture
  • Harvard Architecture

19. What is usually held in the contents of RAM?

  • BIOS and Boot sequence needed to start the computer
  • Software programs stored within the computer
  • Operating System and currently running programs
  • Recently executed instructions in case they are needed again

20. Volatile memory that runs the Operating System and other applications

  • Virtual Memory
  • Registers
  • RAM
  • ROM

21. Which of the following is not part of the CPU?

  • ALU
  • CU
  • MAR
  • ROM

22. Which of the images below demonstrates the Von Neumann Architecture

23. What architecture stores both program instructions and data in main memory

  • Processing Architecture
  • Harvard Architecture
  • PC Architecture
  • Von Neumann Architecture

24. A time sharing system imply

  • . more than one processor in the system
  • . more than one program in memory
  • . more than one memory in the system
  • . none of above

25. The branch logic that provides decision making capabilities in the control unit is known as

  • . controlled transfer
  • . conditional transfer
  • . unconditional transfer
  • . none of above

26. A stack pointer is

  • . a 16-bit register in the microprocessor that indicate the beginning of the stack memory.
  • . a register that decodes and executes 16-bit arithmetic expression.
  • . the first memory location where a subroutine address is store
  • . a register in which flag bits are stored

27. A stack is

  • . an 8-bit register in the microprocessor
  • . a 16-bit register in the microprocessor
  • . a set of memory locations in r/wm reserved for storing information temporarily during the execution of computer
  • . a 16-bit memory address stored in the program counter

28. A complete microcomputer system consists of

  • . microprocessor
  • . memory
  • . peripheral equipment
  • . all of above

29. The next instruction is located?

  • . memory address register
  • . memory data register
  • . instruction register
  • . program register

30. Where does a computer add and compare data?

  • . hard disk
  • . floppy disk
  • . cpu chip
  • . memory chip

31. Rotational latency, and transfer time. Rotational latency refers to ______.

  • . the time its takes for the platter to make a full rotation
  • . the time it takes for the read-write head to move into position over the appropriate track
  • . the time it takes for the platter to rotate the correct sector under the head
  • . none of the above

32. (2FAOC)16 is equivalent to _____.

  • . (195 084)10
  • . (001011111010 0000 1100)2
  • . both and (b)
  • . none of these

33. _________ register keeps track of the instructions stored in program stored in memory.

  • . ar (address register)
  • . xr (index register)
  • . pc (program counter)
  • . ac (accumulator)

34. If memory access takes 20 ns with cache and 110 ns without it, then the ratio (cache uses a 10 ns memory) is _____.

  • . 93%
  • . 90%
  • . 88%
  • . 87%

35. . In a memory-mapped I/O system, which of the following will not be there?

  • . lda
  • . in
  • . add
  • . out

36. In signed-magnitude binary division, if the dividend is (11100)2 and divisor is (10011)2 then the result is ______.

  • . (00100)2
  • . (10100)2
  • . (11001)2
  • . (01100)2

37. Logic X-OR operation of (4ACO)H& (B53F)H results _____.

  • . aacb
  • . 0000
  • . ffff
  • . abcd

38. A page fault

  • occurs when there is an error in a specific pag
  • occurs when a program accesses a page of main memory.
  • occurs when a program accesses a page not currently in main memory.
  • occurs when a program accesses a page belonging to another program.

39. The effective address in the relative address mode, when an instruction is read from the memory is

  • 849.
  • 850.
  • 801.
  • 802.

40. A stack organized computer has

  • three-address instruction.
  • two-address instruction.
  • one-address instruction.
  • zero-address instruction.

41. In which addressing mode the operand is given explicitly in the instruction

  • absolut
  • immediate .
  • indirect.
  • direct.

42. A combinational logic circuit which sends data coming from a single source to two or more separate destinations is

  • decoder.
  • encoder.
  • multiplexer.
  • demultiplexer.

43. When necessary, the results are transferred from the CPU to main memory by

  • i/o devices.
  • cpu.
  • shift registers.
  • none of thes

44. A successive A/D converter is

  • a high-speed converter.
  • a low speed converter.
  • a medium speed converter.
  • none of thes

45. The memory unit that communicates directly with the CPU is called the

  • main memory
  • secondary memory
  • shared memory
  • auxiliary memory.

46. The maximum addressing capacity of a micro processor which uses 16 bit database & 32 bit address base is

  • 64 k.
  • 4 g
  • both (a) & (b) .
  • none of thes

47. In Assembly language programming, minimum number of operands required for an instruction is/are

  • zero.
  • on
  • two.
  • both (b) & (c) .

48. Which of the following are not a machine instructions

  • mov.
  • org.
  • en
  • (b) & (c) .

49. Which of the following is a main memory

  • secondary memory.
  • auxiliary memory.
  • cache memory.
  • virtual memory.

50. Which of the following interrupt is non maskable

  • intr.
  • rst 7.5.
  • rst 6.5.
  • trap.

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