Daily Practice · GCSE Computer Science
March 1991 5-a-day
Every sheet in March 1991
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st March 1991Convert the denary number 39 to an 8-bit binary number, showing your working.
- 2nd March 1991State what LAN stands for.
- 3rd March 1991Explain the purpose of a breakpoint.
- 4th March 1991An 8-bit register stores the value 01100000 (denary 96). State the resulting 8-bit binary value after a left shift by 1 place, and state whether an overflow occurs.
- 5th March 1991Which CPU register holds the address of the next instruction to be fetched?
- 6th March 1991Distinguish between the network security threats known as phishing and pharming.
- 7th March 1991Explain why a running maximum should be initialised to the first element of the array rather than to 0.
- 8th March 1991A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 9th March 1991A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 10th March 1991A streaming company records which shows each user watches and uses this to recommend similar shows. Explain one ethical concern this could raise, even if the company only uses the data to improve recommendations.
- 11th March 1991State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 12th March 1991Give one specific way this code could be refined without changing what it does: a = 5, b = 3, c = a + b, PRINT c
- 13th March 1991Give one example of an optical secondary storage device.
- 14th March 1991Name the four layers of the TCP/IP model in order from the one closest to the user.
- 15th March 1991State the term used for realistic data that a program would be expected to handle during normal use.
- 16th March 1991A table called members has fields memberId, firstName, lastName and joinYear. Write an SQL statement that adds a new record with memberId 12, firstName 'Priya', lastName 'Shah' and joinYear 2026.
- 17th March 1991State the difference between lossy and lossless compression.
- 18th March 1991State the condition that must be met before a binary search can be used on an array.
- 19th March 1991A logic circuit has inputs C and D. C feeds into a NOT gate; the output of the NOT gate and D feed into an OR gate, giving output Y. Write the Boolean expression for Y and state its value when C = 1 and D = 0.
- 20th March 1991Convert the hexadecimal number FF to an 8-bit binary number.
- 21st March 1991Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
- 22nd March 1991A program compiles and runs but always outputs an average that is too small. State the type of error and explain why the translator did not report it.
- 23rd March 1991Convert the denary number 45 to hexadecimal.
- 24th March 1991What does the acronym CPU stand for?
- 25th March 1991State what the term malware means.
- 26th March 1991An array named temps holds 12 values. State the index of the first item and the index of the last item.
- 27th March 1991An uncompressed file is 6000 KB. After lossless compression it is 1500 KB. Calculate the compression ratio in the form n:1 (original size : compressed size).
- 28th March 1991Which of RAM and ROM is volatile, meaning its contents are lost when the power is removed?
- 29th March 1991Which piece of UK legislation controls how organisations must store and use people's personal data?
- 30th March 1991Given x = 5 and y = 8, state whether x < y AND x > 0 evaluates to True or False.
- 31st March 1991State the correct order of the three operations used to read data from a text file.