WorksheetsSECTION 2
Total questions: 29
Worksheet time: 15mins
What is the effect of defragmenting a magnetic hard disk?
All clusters of each file are put sequentally on the hard disk
The files of the disk are reordered from larger ones to smaller ones
The operating life of the hard disk is extended
It provides more virtual memory to the CPU
It lowers the performance of the disk
How is the information stored in optical disks?
Light changes color for ones and zeros
The surface of the disk is modified so the light is reflected in a different way for ones and zeros
The information is stored and read by magnets
Information is encoded in a way that there is no physical change on the optical disk
None of the above
Which statement is FALSE about SSD
They are called disks but they contain no disk
They have moving parts
They are faster than magnetic hard disks
They are robuster than magnetic storage devices
They are more expensive than magnetic hard disk with the same capacity
Complete the sentence: “Computers are ______ machines; that means that they have ______ possible states in their circuits”.
decimal, ten
digital, 256
alphabetical, 22
binary, two
fancy, sophisticated
The data type that can only represent two different states is called:
Digital
Boolean
Numeric
Text
Mulitimedia
What is the quantization error of a digital signal?
The number of possible values of that signal
The difference between the smallest value of the digital signal and the largest one
The difference between the value of the sample of the analog signal and its quantized value
The difference between the maximum value of the analog signal and the maximum value of the quantized signal
The maximum value that the digital signal can reach
How many different numbers can you represent with 6 bits?
6.0
36.0
64.0
256.0
1024.0
Historically a kilobyte represented 1024 bytes this has changed and nowadays to refer to that amount we use the term
kiribyte
kilibyte
kibybyte
kibibyte
Kilobyte (first letter in caps is the difference)
ASCII Code uses
5 bits
6 bits
7 bits
8 bits
9 bits
What is the effect of sampling an analog signal?
Make it a discrete signal
Reduce noise
Raise its frequency
Lower its frequency
Make it a digital signal
Which is the binary representation of 189?
10111101.0
11100111.0
10101111.0
1101 1001
1 011111111 0111111111
Which of these sentences about Unicode is FALSE
Unicode is big enough to represent any written character in the world
In Unicode all the characters have the same size in bytes.
Unicode can combine characters from different languages in a single document
A character can have several representations in Unicode
The numbers and letters present in ASCII character set are codified the same way in Unicode
Which of the following is correct?
One bit is a block of 8 bytes, and can represent 256 different figures.
One byte is a block of 256 bits, and can represent 1024 different figures.
One byte is a block of 8 bits, and can represent 1024 different figures.
One bit is a block of 64 bytes, and can represent 256 different figures.
One byte is a block of 8 bits, and can represent 256 different figures.
Which sentence is true about memory cards?
They have reached a standard with SD
They have no unique standard but SD seems to be prevailing over the other standards
There is no need for a standard format since adaptors were introduced in the market
They can only be used in digital photo cameras
They have much lower capacities than USB flash
Complete the sentence: “To encode _______ numbers you only need enough bytes to represent in binary code the maximum number you will be using, and one extra bit for the sign; with ________ numbers you can use different a number of bits to represent the floating point number with different precisions”.
negative, integer
integer, real
real, negative
integer, negative
complex, integer
The hexadecimal representation of the 1111101011001110 binary sequence is:
F9A3
F4C3
FADE
FACE
FASE0
One of the main drawbacks of formatting a disk with FAT32 is:
It is much slower than NTFS accessing files
The files are easily corrupted in FAT32 drives
We will not be able to store files bigger than 4 GB
We will not be able to store files bigger than 16 GB
We will not be able to store more than 1,000,000 million of files
Which of the following sentences is FALSE:
A Gigabit is bigger than a Megabit
A Gigabit is the same as a Gygabyte
A Gigabit is bigger than 100 Megabyte
A Megabyte is the same as 0,001 Gigabyte
A Gygabyte is the same as 8,000 Megabits
Which of the following is a Unicode codification widely used in web pages?
ASCII
EBCDIC
UTF-8
UTF-20
None of the above
What is used to modify the surface of an optical disk when it is recorded?
LED diode
Laser
Special paint
Strong magnetic field
Needle
Which of the following natural phenomenons can be represented by an analog signal?
Sound
Temperature
Barometric pressure
Position
All of the above
Which of the following is a hard disk format?
FAT32
NTFS
HFS
ext3
All of the above
10 bytes are the same as:
80 bits
100 bits
512 bits
1024 bits
0,1 Kilobyte
Select the correct order:
KB → GB → MB
MB → GB → KB
GB → KB → MB
KB → MB → GB
MB → KB →GB
Which of the following storage devices uses a laser beam to read and write bits?
USB Flash disk
Magnetic tape
Flash memory
Optical disk
CMOS memory
Which is the binary representation of 17?
111.0
1111.0
10001.0
10000.0
100000.0
Which of the following sentences is FALSE about ASCII character set:
It can represent 256 different characters
It includes codes for non-printing characters
Capital and small letters differ only in one bit
Numbers are codified in a way that the last four bits of the ASCII binary value correspond to the numeric value of the character
Which of the following formats was developed for high definition video?
CD-R
DVD-R
DVD-RW
DVD+
Blu-Ray
A byte is a group of ___ bits
2
4
8
16
32
