1.2 Past Paper Questions
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State two items that will be stored in the ROM for a car’s Follow Me system.
The start-up instructions or BIOS. The program or firmware for operating the Follow Me system itself.
State three items of data that will be stored in the RAM for the Follow Me system.
The current speed of the vehicle. The current distance from the car in front. Data from sensors like radar or cameras.
Explain why an embedded system like Follow Me does not need virtual memory.
It only runs a limited number of specific tasks and is unlikely to run out of physical RAM. It often lacks the secondary storage required to create virtual memory.
Complete the table by converting the 8-bit binary number into denary and the denary number into 8-bit binary.
11110000 binary is 240 denary. 105 denary is 01101001 binary. 00011110 binary is 30 denary.
Complete the table by writing the answer to each statement about binary representation.
Smallest 4-bit denary number is 0. Largest 6-bit denary number is 63. Max colours with 7-bit depth is 128. Min bits for 150 characters is 8.
Show the result of a left binary shift of 4 places on the binary number 00001111.
11110000
Describe how to convert a 2-digit hexadecimal number into denary. Use an example.
Multiply the first digit by 16 and add the value of the second digit. Example: A3 is (10 times 16) plus 3 which equals 163.
Add these two 8-bit binary numbers using binary addition: 01101011 plus 00001111.
1111010
Tick the correct description of sound sampling.
The amplitude of the wave is measured at set intervals.
Explain how changing the bit depth will affect a sound file.
It changes the number of bits used per sample. A higher bit depth increases the accuracy and file size.
Identify whether a musician should buy a magnetic or solid state secondary storage device and justify your choice.
Solid State (SSD). Justification: Faster data access speeds for loading large sound files and more durable with no moving parts.
Identify one other type of secondary storage.
Optical storage for example CD or DVD.
Tick the box to identify the smallest secondary storage capacity.
200000 KB
Calculate an estimate of the storage space in GB for 1000 files with an average size of 3 MB.
3 GB
Tick the statement about binary that is true.
Binary is used because computers are made of switches that can only be on or off.
Complete the table with the missing denary 8-bit binary or hexadecimal values.
Denary 7 is binary 00000111 and hex 7. Denary 49 is binary 00110001 and hex 31. Denary 102 is binary 01100110 and hex 66. Denary 244 is binary 11110100 and hex F4.
Tick the box to identify the largest file size.
200 MB
Tick the two boxes to identify the two file sizes that are equal to each other.
4500000 bytes and 4.5 MB
Identify the binary shift applied to 10110000 to get 10000000.
A left shift of 3 places
Complete the description of how computers represent characters in binary.
A character set stores all of the characters. Each character is given a unique binary code. Lower-case and upper-case letters are given different binary codes. ASCII uses 8 bits. If F is 70 then L is 76.
State what is meant by metadata in an image file.
Data about the data or image file itself for example height width colour depth or creation date.
Using the given binary data and colour codes write the colour for each pixel in a 3x4 grid.
The answer depends on mapping 4-bit binary chunks to the provided colour names like Red Green Blue Purple. The sequence must be followed from top-left to bottom-right.
State the maximum number of different colours that can be represented with a colour depth of 4-bits.
16 colours
State two effects of increasing the colour depth from 4 bits to 2 bytes (16 bits).
The file size will increase. The image can display many more colours improving its quality.