Daily Practice · GCSE Computer Science
September 1969 5-a-day
Every sheet in September 1969
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st September 1969Define the term 'primary key' as used in a database table.
- 2nd September 1969State the difference between lossy and lossless compression.
- 3rd September 1969State the condition that must be met before a binary search can be used on an array.
- 4th September 1969A 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.
- 5th September 1969Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
- 6th September 1969Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
- 7th September 1969Explain the purpose of a breakpoint.
- 8th September 1969Convert the denary number 45 to hexadecimal.
- 9th September 1969What does the acronym CPU stand for?
- 10th September 1969State what the term malware means.
- 11th September 1969Explain why a running maximum should be initialised to the first element of the array rather than to 0.
- 12th September 1969An 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).
- 13th September 1969Which of RAM and ROM is volatile, meaning its contents are lost when the power is removed?
- 14th September 1969Which piece of UK legislation controls how organisations must store and use people's personal data?
- 15th September 1969Given x = 5 and y = 8, state whether x < y AND x > 0 evaluates to True or False.
- 16th September 1969A function is defined as: FUNCTION addTax(price) RETURN price x 1.2 ENDFUNCTION. Another line of code runs: total <- addTax(20) + addTax(30). Trace both function calls and state the final value of total.
- 17th September 1969Give one reason why RAM on its own is not enough, and a computer also needs secondary storage.
- 18th September 1969Name the four layers of the TCP/IP model in order from the one closest to the user.
- 19th September 1969A password field requires between 6 and 12 characters. State two boundary data values that should be used to test this field.
- 20th September 1969A table called staff has fields staffId, name, department and salary, storing these records: staffId | name | department | salary, 1 | Ben | Sales | 24000, 2 | Chloe | IT | 31000, 3 | Dan | Sales | 27000. State which staffId(s) would be returned by: SELECT staffId FROM staff WHERE department = 'Sales' AND salary > 25000;
- 21st September 1969State one function carried out by the operating system of a computer.
- 22nd September 1969In computational thinking, what is meant by the term 'decomposition'?
- 23rd September 1969Given A = 1 and B = 1, state the value of A AND B.
- 24th September 1969Convert the 8-bit binary number 01011010 to denary.
- 25th September 1969Define a peer-to-peer network.
- 26th September 1969A 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.
- 27th September 1969Convert the denary number 5 to a 4-bit binary number.
- 28th September 1969A CPU has a clock speed of 4.0 GHz. Calculate how many clock cycles it completes in 2 seconds.
- 29th September 1969A simple cipher shifts every letter 2 places forward in the alphabet, wrapping around so Y becomes A and Z becomes B. Encrypt the plaintext CAT using this cipher.
- 30th September 1969An array named temps holds 12 values. State the index of the first item and the index of the last item.