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140+ Computer Organization and Architecture Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Bachelor of Computer Applications (BCA) .

1.

In Reverse Polish notation, expression A*B+C*D is written as

A. AB*CD*+
B. A*BCD*+
C. AB*CD+*
D. A*B*CD+
Answer» A. AB*CD*+
2.

SIMD represents an organization that ______________.

A. refers to a computer system capable of processing several programs at the same time.
B. represents organization of single computer containing a control unit, processor unit and a memory unit.
C. includes many processing units under the supervision of a common control unit
D. none of the above.
Answer» C. includes many processing units under the supervision of a common control unit
3.

Floating point representation is used to store

A. Boolean values
B. whole numbers
C. real integers
D. integers
Answer» C. real integers
4.

Suppose that a bus has 16 data lines and requires 4 cycles of 250 nsecs each to transfer data. The bandwidth of this bus would be 2 Megabytes/sec. If the cycle time of the bus was reduced to 125 nsecs and the number of cycles required for transfer stayed the same what would the bandwidth of the bus?

A. 1 Megabyte/sec
B. 4 Megabytes/sec
C. 8 Megabytes/sec
D. 2 Megabytes/sec
Answer» D. 2 Megabytes/sec
5.

Assembly language

A. uses alphabetic codes in place of binary numbers used in machine language
B. is the easiest language to write programs
C. need not be translated into machine language
D. None of these
Answer» A. uses alphabetic codes in place of binary numbers used in machine language
6.

In computers, subtraction is generally carried out by

A. 9’s complement
B. 10’s complement
C. 1’s complement
D. 2’s complement
Answer» D. 2’s complement
7.

The amount of time required to read a block of data from a disk into memory is composed of seek time, rotational latency, and transfer time. Rotational latency refers to

A. the time its takes for the platter to make a full rotation
B. the time it takes for the read-write head to move into position over the appropriate track
C. the time it takes for the platter to rotate the correct sector under the head
D. none of the above
Answer» A. the time its takes for the platter to make a full rotation
8.

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

A. too slow
B. unreliable
C. it is volatile
D. too bulky
Answer» C. it is volatile
9.

Computers use addressing mode techniques for _____________________.

A. giving programming versatility to the user by providing facilities as pointers to memory counters for loop control
B. to reduce no. of bits in the field of instruction
C. specifying rules for modifying or interpreting address field of the instruction
D. All the above
Answer» D. All the above
10.

The circuit used to store one bit of data is known as

A. Register
B. Encoder
C. Decoder
D. Flip Flop
Answer» D. Flip Flop
11.

(2FAOC) 16 is equivalent to

A. (195 084) 10
B. (001011111010 0000 1100) 2
C. Both (A) and (B)
D. None of these
Answer» B. (001011111010 0000 1100) 2
12.

The average time required to reach a storage location in memory and obtain its contents is called the

A. seek time
B. turnaround time
C. access time
D. transfer time
Answer» C. access time
13.

Which of the following is not a weighted code?

A. Decimal Number system
B. Excess 3-cod
C. Binary number System
D. None of these
Answer» B. Excess 3-cod
14.

The idea of cache memory is based

A. on the property of locality of reference
B. on the heuristic 90-10 rule
C. on the fact that references generally tend to cluster
D. all of the above
Answer» A. on the property of locality of reference
15.

Which of the following is lowest in memory hierarchy?

A. Cache memory
B. Secondary memory
C. Registers
D. RAM
Answer» B. Secondary memory
16.

The addressing mode used in an instruction of the form ADD X Y, is

A. Absolute
B. indirect
C. index
D. none of these
Answer» C. index
17.

If memory access takes 20 ns with cache and 110 ns with out it, then the ratio ( cache uses a 10 ns memory) is

A. 93%
B. 90%
C. 88%
D. 87%
Answer» B. 90%
18.

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

A. LDA
B. IN
C. ADD
D. OUT
Answer» A. LDA
19.

In a vectored interrupt.

A. the branch address is assigned to a fixed location in memory.
B. the interrupting source supplies the branch information to the processor through an interrupt vector.
C. the branch address is obtained from a register in the processor
D. none of the above
Answer» B. the interrupting source supplies the branch information to the processor through an interrupt vector.
20.

Von Neumann architecture is

A. SISD
B. SIMD
C. MIMD
D. MISD
Answer» A. SISD
21.

The circuit used to store one bit of data is known as

A. Encoder
B. OR gate
C. Flip Flop
D. Decoder
Answer» C. Flip Flop
22.

Cache memory acts between

A. CPU and RAM
B. RAM and ROM
C. CPU and Hard Disk
D. None of these
Answer» A. CPU and RAM
23.

Write Through technique is used in which memory for updating the data

A. Virtual memory
B. Main memory
C. Auxiliary memory
D. Cache memory
Answer» D. Cache memory
24.

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

A. Consumes less power
B. has higher speed
C. has lower cell density
D. needs refreshing circuitary
Answer» B. has higher speed
25.

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

A. (00100) 2
B. (10100) 2
C. (11001) 2
D. (01100) 2
Answer» B. (10100) 2
26.

Virtual memory consists of

A. Static RAM
B. Dynamic RAM
C. Magnetic memory
D. None of these
Answer» A. Static RAM
27.

In a program using subroutine call instruction, it is necessary

A. initialise program counter
B. Clear the accumulator
C. Reset the microprocessor
D. Clear the instruction register
Answer» D. Clear the instruction register
28.

A Stack-organised Computer uses instruction of

A. Indirect addressing
B. Two-addressing
C. Zero addressing
D. Index addressing
Answer» C. Zero addressing
29.

If the main memory is of 8K bytes and the cache memory is of 2K words. It uses associative mapping. Then each word of cache memory shall be

A. 11 bits
B. 21 bits
C. 16 bits
D. 20 bits
Answer» C. 16 bits
30.

A-Flip Flop can be converted into T-Flip Flop by using additional logic circuit

A. n TQD =•
B. T D =
C. D = T . Q n
D. n TQD =⊕
Answer» D. n TQD =⊕
31.

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

A. AACB
B. 0000
C. FFFF
D. ABCD
Answer» C. FFFF
32.

When CPU is executing a Program that is part of the Operating System, it is said to be in

A. Interrupt mode
B. System mode
C. Half mode
D. Simplex mode
Answer» B. System mode
33.

An n-bit microprocessor has

A. n-bit program counter
B. n-bit address register
C. n-bit ALU
D. n-bit instruction register
Answer» D. n-bit instruction register
34.

Cache memory works on the principle of

A. Locality of data
B. Locality of memory
C. Locality of reference
D. Locality of reference & memory
Answer» C. Locality of reference
35.

The main memory in a Personal Computer (PC) is made of

A. cache memory.
B. static RAM
C. Dynamic Ram
D. both (A) and (B) .
Answer» D. both (A) and (B) .
36.

In computers, subtraction is carried out generally by

A. 1's complement method
B. 2's complement method
C. signed magnitude method
D. BCD subtraction method
Answer» B. 2's complement method
37.

PSW is saved in stack when there is a

A. interrupt recognised
B. execution of RST instruction
C. Execution of CALL instruction
D. All of these
Answer» A. interrupt recognised
38.

The multiplicand register & multiplier register of a hardware circuit implementing booth's algorithm have (11101) & (1100). The result shall be

A. (812) 10
B. (-12) 10
C. (12) 10
D. (-812) 10
Answer» A. (812) 10
39.

The circuit converting binary data in to decimal is

A. Encoder
B. Multiplexer
C. Decoder
D. Code converter
Answer» D. Code converter
40.

A three input NOR gate gives logic high output only when

A. one input is high
B. one input is low
C. two input are low
D. all input are high
Answer» D. all input are high
41.

n bits in operation code imply that there are ___________ possible distinct operators

A. 2n
B. 2n
C. n/2
D. n2
Answer» B. 2n
42.

_________ register keeps tracks of the instructions stored in program stored in memory.

A. AR (Address Register)
B. XR (Index Register)
C. PC (Program Counter)
D. AC (Accumulator)
Answer» C. PC (Program Counter)
43.

Memory unit accessed by content is called

A. Read only memory
B. Programmable Memory
C. Virtual Memory
D. Associative Memory
Answer» D. Associative Memory
44.

‘Aging registers’ are

A. Counters which indicate how long ago their associated pages have been referenced.
B. Registers which keep track of when the program was last accessed.
C. Counters to keep track of last accessed instruction.
D. Counters to keep track of the latest data structures referred.
Answer» A. Counters which indicate how long ago their associated pages have been referenced.
45.

The instruction ‘ORG O’ is a

A. Machine Instruction.
B. Pseudo instruction.
C. High level instruction.
D. Memory instruction.
Answer» B. Pseudo instruction.
46.

Translation from symbolic program into Binary is done in

A. Two passes.
B. Directly
C. Three passes.
D. Four passes.
Answer» A. Two passes.
47.

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

A. Overflow
B. Underflow
C. Important number
D. Undefined
Answer» B. Underflow
48.

The BSA instruction is

A. Branch and store accumulator
B. Branch and save return address
C. Branch and shift address
D. Branch and show accumulator
Answer» B. Branch and save return address
49.

Logic gates with a set of input and outputs is arrangement of

A. Combinational circuit
B. Logic circuit
C. Design circuits
D. Register
Answer» A. Combinational circuit
50.

MIMD stands for

A. Multiple instruction multiple data
B. Multiple instruction memory data
C. Memory instruction multiple data
D. Multiple information memory data
Answer» A. Multiple instruction multiple data

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