Computer Organization and Architecture
Exam Duration: 45 Mins Total Questions : 30
Consider the following floating point number representation
Exponent | Mantissa |
The exponent is in 2's complement representaion and mantissa is in the sign magnitude representation. The range of the magnitude of the normalized number in this representation is
- (a)
0 to 1
- (b)
0.5 t0 1
- (c)
2-23 to 0.5
- (d)
0.5 to (1-2-23)
Which of the following statements is correct about Booth's algorithm in general form .......
- (a)
In general in the booth scheme-1 times shifted multiplicated is selected when moving from 0 to 1
- (b)
In general in the booth scheme-1 times shifted multiplicated is selected when moving from 1 to 0
- (c)
Neither (a) nor (b)
- (d)
Both (a) and (b)
In 2's complement rep[resentation, if two numbers with the same sign are added, then
- (a)
overflow occur if and only if the result has the opposite sign
- (b)
overflow occur if and only if the result has same sign
- (c)
overflow does not occur
- (d)
Both (a) and (b)
The bandwidth of memory system is given by
- (a)
number of bit/total time
- (b)
total time/number of bit
- (c)
number of bit x total time
- (d)
All of the above
Control cicuit designed by .... tends to have a random structure
- (a)
a stable table method
- (b)
delay element method
- (c)
sequence counter method
- (d)
None of these
Which of the following is displacement addressing mode?
- (a)
Relative
- (b)
Indexed
- (c)
Base
- (d)
All of these
Which ofd the following instructions is an example of direct addressng mode?
- (a)
MOV A, B
- (b)
2050
- (c)
05
- (d)
HLT
An instruction at location 300 with its address field at location 301 the address field has value 400. A processor register R1 contains the number 200. Evaluate the effective address, matching the following addressing mode the ir respective address.
a. Direct 1. 702
b. Immediate 2. 200
c. Relative 3. 400
d. Register indirect 4. 600
e. Index (R1 is index) 5. 301
- (a)
a-3, b-5, c-1, d-2, e-4
- (b)
a-3, b-4, c-2, d-1, e-5
- (c)
a-3, b-3, c-2, d-1, e-4
- (d)
a-4, b-3, c-1, d-5, e-2
Match the following in context of an 8085 uP.
A. DAA | 1. Program control instruction |
B. LXI | 2. Data movement instruction |
C. RST | 3. Interrupt instruction |
D. JMP | 4. instruction |
- (a)
A B C D 1 2 3 4 - (b)
A B C D 4 2 3 1 - (c)
A B C D 3 2 1 4 - (d)
A B C D 2 3 4 1
The number of memory reference required for CPU to execute direct mode address reference is
- (a)
0
- (b)
1
- (c)
2
- (d)
3
Match the following
a. Immediate address | 1. local variables |
b. Direct address mode | 2. Relocate program |
c. Indirect address mode | 3. Pointers. |
d. Index address mode | 4. Locality of references |
e. Base address mode | 5. Arrays |
f. Relative address mode | 6. Constant operands |
- (a)
a-6, b-1, c-3, d-5, e-2, f-4
- (b)
a-5, b-4, c-6, d-3, e-1, f-2
- (c)
a-3, b-5, c-2, d-4, e-1, f-6
- (d)
a-6, b-5, c-2, d-3, e-1, f-4
Linkage between CPU and the user is procided by
- (a)
peripheral devices
- (b)
control unit
- (c)
storage
- (d)
software
Whihc of the following units is used to superwise each instruction in the CPU?
- (a)
Control logic unit
- (b)
Accumulator
- (c)
ALU
- (d)
Control register
Comparing the time T1 taken for a single instruction on a pipelined CPU with time T2 taken on a non-pipelined but identical CPU, we can say that
- (a)
\({ T }_{ 1 }\le { T }_{ 2 }\)
- (b)
\({ T }_{ 1 }\ge { T }_{ 2 }\)
- (c)
\({ T }_{ 1 }<{ T }_{ 2 }\)
- (d)
\({ T }_{ 1 }{ isT }_{ 2 }\) plus line taken for one instruction fetch cycle
A pipeline is having speed up factor as 10 and operating with effiency of 80%. What will be the number of stages in the pipeline?
- (a)
10
- (b)
8
- (c)
13
- (d)
None of these
A ROM is used to store the table for multiplication of two 8-bit unsigned integers. The size of ROM required is
- (a)
256 x 16
- (b)
4k x 6
- (c)
64k x 8
- (d)
64 k x 16
Increasing the RAM of a computer typically improves performance because
- (a)
virtual memory increases
- (b)
larger RAMs are faater
- (c)
fewer segmentation faults occur
- (d)
fewer page faults occur
Consider the following statements:
S1 : Booth algorithm reduces the space for fixed point signed multiplication.
S2 : Booth algorithm increases time for fixed point signed multiplication.
Which of the following is true?
- (a)
S1
- (b)
S2
- (c)
Cannot say
- (d)
None of these
Computer organization deals with
- (a)
addressing modes
- (b)
data format
- (c)
logical design of system
- (d)
None of the above
Programming that actually controls the path of signals or data within computer is called
- (a)
microprogramming
- (b)
systems programming
- (c)
assembly language programming
- (d)
machine language programming
Tag bits in direct mapping can be given by
- (a)
log2m
- (b)
log2(m/n)
- (c)
log2n
- (d)
log2mn
Advantages of DMA over software transfer are
- (a)
tack of software overhead from loop-control instructions.
- (b)
that it leaves the bus free for the CPU to access main memory.
- (c)
that it combines multiple interrupt into one
- (d)
both (a) and (c)
Which of the following statements is incorrect about immediate addressng mode?
I. The operand data is directly specified in the operand field.
II. The instruction is multiword instructin, where operand immediately follows the opcode.|
III. The opcode and the operand are fetched from memory using program counter.
- (a)
I and II
- (b)
I, II and III
- (c)
Only II
- (d)
None of these
Addressing mode are
- (a)
Explicity specified
- (b)
Implied by the instruction
- (c)
Both (a) and (b)
- (d)
Neither (a) nor (b)
Which of the following processor registers are used for fetch and execute operations?
(i) Program counter
(ii) Instructin re3gister
(iii) Address register
- (a)
(i), (ii)
- (b)
(ii), (iii)
- (c)
(i), (ii)
- (d)
None of these
The immediate addressing mode can be used for
(i) loading internal register with intial value
(ii) perform arithmetic or logical operation on immediate data.
- (a)
I only
- (b)
II only
- (c)
Both I and II
- (d)
Neither I nor II
The speed imbalance between memory access and CPU operation can be reduced by
- (a)
cache memory
- (b)
memory interleavng
- (c)
reducing sizes of memory
- (d)
None of the above
Which of tyhe following statements is correct abut the advantage of register indirect addressing?
I. This mode is used toi save program space.
II. This mode improves speed of program execution in some situation.
- (a)
I only
- (b)
II only
- (c)
I and II both
- (d)
Neither I nor II.
Which of the following is not an advantage of virual memory?
- (a)
Faster access to memory on an average
- (b)
Process can be gicven protected address space
- (c)
Linker can assign address independent of where the program will be loaded in main memory.
- (d)
Program larger than physical memory size can be run
An address space is specified by 24-bit and the correspondence memory space is 16 bit.
How many wrds are there in address space?
- (a)
1 M Words
- (b)
64 k Words
- (c)
16 k Words
- (d)
64 m Words