Information Representation
56 questions· page 1 of 6
One of the images is a bitmapped image.
Complete the table by writing the answer for each statement.
| Statement | Answer |
|---|---|
| the term for the smallest element that makes up an image | |
| the largest number of different colours that can be represented with a bit depth of 8 bits | |
| the term for the dots per inch (dpi) when an image is displayed |
Give two advantages of using the Unicode character set instead of using the ASCII character set.
1 ........................................................................................................................................
2 ........................................................................................................................................
The Unicode character '❮' has the binary value: 0010 0111 0110 1110
Convert the binary value for the character '❮' into denary.
The Unicode character '⅀' has the hexadecimal value 2140
Convert the hexadecimal code for the character '⅀' into denary.
Convert the denary integer 558 into 12-bit binary and hexadecimal.
Binary .......................................................................................................................................
Hexadecimal .............................................................................................................................
Convert the two’s complement binary integer 11100010 into denary.
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Write the smallest and the largest two’s complement binary integers that can be represented in 8 bits.
Smallest ............................................................................................................................
Largest ..............................................................................................................................
Give one application where Binary Coded Decimal (BCD) is used and justify its use.
Application ................................................................................................................................
Justification ...............................................................................................................................
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Calculate the file size of the image created by the digital camera in megabytes (MB).
Show your working.
Working space ...................................................................................................................
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Answer ...................................... MB
The student takes a second photograph with a lower bit depth.
Explain the effect of decreasing the bit depth on the image and on the image file.
Effect on image .................................................................................................................
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Effect on image file ............................................................................................................
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A teacher records an audio file of the student playing the piano during a music lesson.
Complete the table by giving the term for each description about sound representation on a computer.
| Description | Term |
|---|---|
| the number of times the amplitude is measured per time interval | |
| the number of bits used to store each amplitude measurement | |
| the type of sound wave before it is recorded by a computer |
The computer uses the Unicode character set.
Give two characteristics of the Unicode character set.
1 ........................................................................................................................................
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2 ........................................................................................................................................
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Some of the school’s computers use the extended ASCII character set.
The table gives some characters from the extended ASCII character set, their denary, 8-bit binary and hexadecimal numbers.
Complete the table by filling in the missing numbers.
| Character | Denary | 8-bit Binary | Hexadecimal |
|---|---|---|---|
| ! | 33 | 21 | |
| L | 01001100 | 4C | |
| ü | 252 | 11111100 |
Convert the binary number into hexadecimal.
101100111010
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Convert the denary number into Binary Coded Decimal (BCD).
108
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Convert the 12-bit two’s complement binary integer into denary.
Show your working.
111110111100
Working .............................................................................................................................
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Denary value ..................................................
The following binary addition is performed using 8-bit registers.
Complete the calculation using binary addition.
1 0 1 1 0 0 1 1
+ 0 1 1 1 1 0 0 0
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Name and describe the error that can occur when binary addition is performed.
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The following binary addition is performed using 8-bit registers.
Complete the calculation using binary addition.
1 0 0 0 0 1 1 1
+ 0 0 1 1 1 0 0 1
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A computer uses the Unicode character set.
State the number of bits used to store one character from the Unicode character set.
A student creates sound recordings.
Making changes to a sound recording may impact the accuracy of the resulting sound file or the size of the file.
Draw two lines from each change to the impacts it has on the sound file.
The file names of the sound recordings are stored using the ASCII character set.
Explain how text is represented by the ASCII character set.
Put one tick (✓) in each row to identify the minimum number of bits used to store each example of data.
| Example of data | 4 | 8 | 16 | 24 | 32 | 64 | 128 |
|---|---|---|---|---|---|---|---|
| the hexadecimal value F139 | |||||||
| 16 000 000 unique amplitude values | |||||||
| an IPv4 address | |||||||
| 256 unique colours | |||||||
| an IPv6 address | |||||||
| the denary value 65 000 |
A three-place arithmetic shift to the right is performed on the following two’s complement negative integer.
Show the result of this arithmetic shift.
10010011
Complete the binary addition. Show your working.
1 0 0 1 1 1 1 0
0 1 1 0 0 0 0 1
+ 0 0 0 1 1 0 0 1
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Tick (✓) one box only to identify the largest file size.
| 3300 kibibytes | |
| 0.3 megabytes | |
| 3 mebibytes | |
| 3300 kilobytes |
Subtract the denary number 10 from the denary number 100 using binary subtraction.
Show your working.
Working .....................................................................................................................................
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Answer ....................................
Convert the hexadecimal number C0F into denary.
Show your working.
Working .....................................................................................................................................
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Answer ....................................
Complete the following description.
A kibibyte has a ................................................ prefix. Three kibibytes is the same as ................................................ bytes.
A megabyte has a ................................................ prefix. Two terabytes is the same as ................................................ gigabytes.
Complete the table by identifying the number of bits each of the character sets allocates to each character.
| Character set | Number of bits |
|---|---|
| ASCII | |
| extended ASCII | |
| Unicode |