OCR J277 GCSE Computer Science
Paper 1 Questions with Correct
Answers
State what is meant by character set. - ANSWERSAll the different characters a
computer can represent.
Identify how many different characters that ASCII can represent. - ANSWERS256
because it has 8 bits per character - 2^8 = 256
How to calculate file size - ANSWERSnumber of bytes/1000 = file size in kilobytes
Calculate the file size of a text file with 2000 characters - ANSWERS1 character is 1
byte. 2000/1000 = 2 Kilobytes
Identify registers. - ANSWERSMAR, MDR, PC, AC
PC (Program Counter) - ANSWERSStores the address of the next instruction to be
fetched from memory. Increments in each fetch-execute cycle.
CU (Control Unit) - ANSWERSControls the flow of data and carries out instructions.
MAR (Memory Address Register) - ANSWERSStored the address of the data to be
fetched from, or the address where the data is to be stored.
ALU (Arithmetic Logic Unit) - ANSWERSPerforms the mathematical and logical
calculations.
Define an embedded system - ANSWERSThey are small systems inside a machine that
carry out functions specific to the machine. Embedded systems have limited functions.
They are often built into larger machines.
True or False: Each colour has a unique binary code. - ANSWERSTrue
True or False: Metadata stores the colour of each pixel in the image - ANSWERSFalse
What does metadata store - ANSWERSdata/information about data
True or False: A bitmap is made of pixels. - ANSWERSTrue
True or False: The higher the colour depth, the smaller the number of different colours
can be displayed - ANSWERSFalse
Paper 1 Questions with Correct
Answers
State what is meant by character set. - ANSWERSAll the different characters a
computer can represent.
Identify how many different characters that ASCII can represent. - ANSWERS256
because it has 8 bits per character - 2^8 = 256
How to calculate file size - ANSWERSnumber of bytes/1000 = file size in kilobytes
Calculate the file size of a text file with 2000 characters - ANSWERS1 character is 1
byte. 2000/1000 = 2 Kilobytes
Identify registers. - ANSWERSMAR, MDR, PC, AC
PC (Program Counter) - ANSWERSStores the address of the next instruction to be
fetched from memory. Increments in each fetch-execute cycle.
CU (Control Unit) - ANSWERSControls the flow of data and carries out instructions.
MAR (Memory Address Register) - ANSWERSStored the address of the data to be
fetched from, or the address where the data is to be stored.
ALU (Arithmetic Logic Unit) - ANSWERSPerforms the mathematical and logical
calculations.
Define an embedded system - ANSWERSThey are small systems inside a machine that
carry out functions specific to the machine. Embedded systems have limited functions.
They are often built into larger machines.
True or False: Each colour has a unique binary code. - ANSWERSTrue
True or False: Metadata stores the colour of each pixel in the image - ANSWERSFalse
What does metadata store - ANSWERSdata/information about data
True or False: A bitmap is made of pixels. - ANSWERSTrue
True or False: The higher the colour depth, the smaller the number of different colours
can be displayed - ANSWERSFalse
