COA Unit-1 MCQ - Computer Evolution and Performance
UNIT-1
Computer Evolution and Performance
MCQ For
Online Exam
1)
The Von Neumann system was such that
a)
Different memory for data and program
b)
Same memory for data and program
c)
Program input from user
d)
Separate data memory
Ans: b)
Explanation: In this both program and data is stored on
common memory.
2) The necessary input device is
a) Mouse
b)
Keyboard
c) Scanner
d)
Joystick
Ans: b)
Explanation: Without Keyboard computer system is not
started.
3) Which unit generates the
timing signals for data transfer?
a)
ALU
b)
Control Unit
c)
I/O Devices
d)
Memory
Ans: b)
Explanation: CU is responsible
for generating timing and control signals.
4) In Von Neumann system the
program is executed in
a) Concurrently
b) Randomly
c)
Sequentially
d) None of these
Ans: c)
Explanation:
Most of the processors work with sequential program execution including
Harvard's system.
5) register is used to store
address from where data is to be retrieved.
a)
MAR
b)
PC
c)
IR
d)
DR
Ans: a) MAR
Explanation:
The address given by the PC is forwarded to the address bus of the processor
through memory address register (MAR).
6) The Harvard system
uses .
a)
Different memory for program and data
b)
Same memory for program and data
c)
Separate code, stack and data memory.
d)
None of these.
Ans: a)
Explanation: It uses different memory to store instruction
and data.
7) The first Computer ENIAC
consist of
a)
Vacuum Tubes
b)
Transistor
c)
Integrated Circuits
d)
VLSI
Ans: a)
Explanation: This is the first generation computer so uses
vacuum tubes.
8) SPEC stands for,
a) Standard Performance
Evaluation Code.
b) System Processing Enhancing Code.
c) System Performance
Evaluation Corporation.
d)
Standard Processing Enhancement Corporation.
Answer:c
Explanation: SPEC
is a corporation started to standardize the evaluation method of a systems
performance.
9)
The average number of steps taken to execute the set
of instructions can be made to be less
than one by following .
a)
ISA
b) Pipe-lining
c) Super-scaling
d) Sequential
View Answer
Answer:c
Explanation: The
number of steps required to execute a given set of instructions is sufficiently
reduced by using super-scaling. In this method a set of instructions are
grouped together and are processed.
10)
A processor performing fetch or decoding of different
instruction during the execution of
another instruction is called .
a) Super-scaling
b) Pipe-lining
c) Parallel Computation
d)
None of these
Answer:b
Explanation:
Pipe-lining is the process of improving the performance of the system by
processing different instructions at the same time, with only one instruction
performing one specific operation.
11)
Two processors A and B have clock frequencies of 700
Mhz and 900 Mhz respectively.
Suppose A can execute an instruction with an average of 3 steps and B can
execute with an average of 5 steps. For the execution of the same instruction
which processor is faster ?
a) A
b) B
C) Both take the same time
d) Insuffient
information
Answer: a
Explanation: The
performance of a system can be found out using the Basic performance formula.
12) The time delay between two
successive initiation of memory operation .
a) Memory access time
b) Memory search time
c) Memory cycle time
d)
Instruction delay
Answer:c
Explanation: The time taken to
finish one task and to start another.
13) The ALU makes use of
to store the
intermediate results .
a) Accumulators
b) Registers
c) Heap
d)
Stack View Answer
Answer:a
Explanation:
The ALU is the computational center of the CPU. It performs all the
mathematical and logical operations. In order to perform better it uses some
internal memory spaces to store immediate results.
14) The format is usually used to store
data .
a) BCD
b) Decimal
c) Hecadecimal
d)
Octal View
Answer:a
Explanation : The
data usually used by computers have to be stored and represented in a
particular format for ease of use.
15) The 8-bit encoding format
used to store data in a computer is _ .
a) ASCII
b) EBCDIC
c) ANCI
d)
USCII View
Answer:b
Explanation: The
data to be stored in the computers have to be encoded in a particular way so as
to be provide secure processing of the data.
16) A source program is usually
in .
a) Assembly language
b) Machine level language
c) High-level language
d) Natural language View Answer
Answer:c
Explanation: The
program written and before being compiled or assembled is called as a source
program.
17) Which method/s of
representation of numbers occupies large amount of memory than others?
a) Sign-magnitude
b) 1’s compliment
c) 2’s compliment
d)
Both a and b
Answer:a
Explanation: It takes more
memory as one bit used up to store the sign.
18) Which representation is most
efficient to perform arithmetic operations on the numbers ?
a) Sign-magnitude
b) 1’s compliment
c) 2’S compliment
d)
None of the above View Answer
Answer:c
Explanation:
The two’s compliment form is more suitable to perform arithmetic operations as
there is no need to involve the sign of the number into consideration.
19)
When we subtract -3 from 2 , the answer in 2’s
compliment form is . a) 0001
b) 1101
c) 0101
d) 1001
Answer:c
Explanation:
First the 2’s compliment is found and that is added to the number and the
overflow is ignored.
20) The most efficient method
followed by computers to multiply two unsigned numbers is
a) Booth algorithm
b) Bit pair recording of multipliers
c) Restoring algorithm
d) Non
restoring algorithm View Answer
Answer: b
21)
The most efficient method followed by computers to multiply two signed
numbers is
a) Booth algorithm
b) Bit pair recording of multipliers
c) Restoring algorithm
d) Non
restoring algorithm View Answer
Answer: a
22)
Booth's algorithm will require cycles to multiply 25 and -5.
a) 4
b) 5
c) 6
d) 7
Answer:c)
Since 25 is in the range of 6-bit
representation of 2's complement number, so require 6 cycles.
23)
When 1101 is used to divide 100010010 the remainder is .
a) 101
b)
11
c) 0
d) 1
View Answer
Answer:d
24)
IEEE double precision of floating point representation has bits. 1)
32
2) 64
3) 128
4) None of these.
25) IEEE double precision mantissa has bits.
1)
8
2) 23
3) 11
4) 52
