ObjectiveMcq
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75 practice sets · Page 2 of 4
Dynamic RAM is used as main memory in a computer system as __________
Consumes less power
Has higher speed
It needs refreshing circuitry
It has a lower cell density
Dynamic RAM is used as main memory in a computer system as it has a higher speed due to the presence of MOSFET technology. However, it’s access time is more compared to SRAM and operation is slow.
Virtual memory consists of __________
DRAM
Main Memory
Magnetic memory
SRAM
Most modern operating systems employ a method of extending RAM capacity, known as virtual memory which consists of SRAM.
The main memory of a PC is made of __________
Both cache and dynamic RAM
Dynamic RAM
Static RAM
Cache
The main memory of a PC is made of cache and DRAM. DRAM offers reduced power consumption and large storage capacity in a single memory chip.
The dynamic RAM offers __________
High power consumption, large storage capacity
High power consumption, short storage capacity
Reduced power consumption, short storage capacity
Reduced power consumption, large storage capacity
The dynamic RAM offers reduced power consumption and large storage capacity in a single memory chip. With the availability of such high packing density memory ICs, the capacity of memory will continue to grow. However, it’s access time is more and thus operation is slow.
What is the disadvantage of MOS capacitor in DRAM?
It can’t hold the data till a long period
It doesn’t holds the charge till a long period
It is not flexible
It is highly densed
The disadvantage of MOS capacitor in DRAM is that it can’t hold the stored charge over a long period of time and it has to be refreshed every few millisecond. Thus, DRAM is slow in operation.
DRAM uses of integrated MOS capacitors as _______ instead of a flip-flop.
Dynamic cell
Storage cell
Static cell
Memory cell
DRAM uses of integrated MOS capacitors as memory cell instead of a flip-flop. The advantage of this cell is that it allows very large memory arrays to be constructed on a chip at a lower cost per bit than in static memories.
Most modern operating systems employ a method of extending RAM capacity, known as __________
Magnetic memory
Static memory
Virtual memory
Storage memory
Most modern operating systems employ a method of extending RAM capacity, known as virtual memory. Virtual memory is seen as part of main memory but is actually a secondary memory.
The DRAM stores its binary information on __________
BJT
Capacitor
Transistor
MOSFET
Capacitor has high storing capability only, so DRAM stores its binary information in the form of electric charges on capacitors. However, DRAM takes more time time to access data.
The memory size of DRAM is ____________
64 to 512 MB
16 to 256 MB
1 to 100 MB
512 to 1024 MB
The Dynamic Random Access Memory is the lowest cost, highest density random access memory available. Nowadays, computers use DRAM for main memory. However, it’s access time is more compared to SRAM. The memory size of DRAM lies between 16 to 256 MB.
Dynamic RAM is more preferable than static RAM, why?
DRAM is of the lowest cost, lowest density
DRAM is of the lowest cost, highest density
DRAM is more flexible and lowest storage capacity
DRAM is of the highest cost, reduced size
The Dynamic Random Access Memory is the lowest cost, highest density random access memory available. Nowadays, computers use DRAM for main memory. However, it’s access time is more compared to SRAM.
Which IC is used for the implementation of 1-to-DEMUX?
IC 74155
IC 74138
IC 74139
IC 74154
IC 74154 is used for the implementation of 1-to-16 DEMUX, whose output is inverted input.
How many AND gates are required for a 1-to-8 multiplexer?
6
5
2
8
The number of AND gates required will be equal to the number of outputs in a demultiplexer, which are 8.
How many select lines are required for a 1-to-8 demultiplexer?
5
2
4
3
The formula for total no. of outputs is given by 2n, where n is the no. of select lines. In this case n = 3 since 23 = 8.
In 1-to-4 multiplexer, if C1 = 1 & C2 =then the output will be ____________
Y3
Y0
Y2
Y1
No explanation is available for this question yet.
In a multiplexer the output depends on its ____________
Enable pin
Data inputs
Select inputs
Select outputs
A demultiplexer sends a single input to multiple outputs, depending on the select lines. As the select input changes, the output of the multiplexer varies according to that input.
In 1-to-4 demultiplexer, how many select lines are required?
3
5
2
4
The formula for total no. of outputs is given by 2n, where n is the no. of select lines. Therefore, for 1:4 demultiplexer, 2 select lines are required.
Most demultiplexers facilitate which type of conversion?
AC to DC
Single input, multiple outputs
Odd parity to even parity
Decimal-to-hexadecimal
A demultiplexer sends a single input to multiple outputs, depending on the select lines. Demultiplexer converts single input into multiple outputs.
Why is a demultiplexer called a data distributor?
The output will be distributed to one of the inputs
Single input gives single output
One of the inputs will be selected for the output
The input will be distributed to one of the outputs
A demultiplexer sends a single input to multiple outputs, depending on the select lines. For one input, the demultiplexer gives several outputs. That is why it is called a data distributor.
The addition of +and +results as _________ in 2’s complement system.
00101010
0111110
101011010
11001010
The decimal numbers are converted to their respective binary equivalent and then the binary addition rules are applied.
For arithmetic operations only _________
10’s complement
1’s complement is used
9’s complement
2’s complement
Only 2’s complement is used for arithmetic operations, as it is more fast.
