Daily Practice · GCSE Computer Science
December 1975 5-a-day
Every sheet in December 1975
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st December 1975State the condition that must be met before a binary search can be used on an array.
- 2nd December 1975A 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.
- 3rd December 1975Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
- 4th December 1975Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
- 5th December 1975A 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.
- 6th December 1975Convert the denary number 45 to hexadecimal.
- 7th December 1975What does the acronym CPU stand for?
- 8th December 1975State what the term malware means.
- 9th December 1975An array named temps holds 12 values. State the index of the first item and the index of the last item.
- 10th December 1975An 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).
- 11th December 1975Which of RAM and ROM is volatile, meaning its contents are lost when the power is removed?
- 12th December 1975Which piece of UK legislation controls how organisations must store and use people's personal data?
- 13th December 1975Given x = 5 and y = 8, state whether x < y AND x > 0 evaluates to True or False.
- 14th December 1975A 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.
- 15th December 1975Give one reason why RAM on its own is not enough, and a computer also needs secondary storage.
- 16th December 1975State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
- 17th December 1975A password field requires between 6 and 12 characters. State two boundary data values that should be used to test this field.
- 18th December 1975A 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;
- 19th December 1975State one function carried out by the operating system of a computer.
- 20th December 1975In computational thinking, what is meant by the term 'decomposition'?
- 21st December 1975Given A = 1 and B = 1, state the value of A AND B.
- 22nd December 1975Convert the 8-bit binary number 01011010 to denary.
- 23rd December 1975Define a peer-to-peer network.
- 24th December 1975State why a program written in a high level language must be translated.
- 25th December 1975Convert the denary number 5 to a 4-bit binary number.
- 26th December 1975A CPU has a clock speed of 4.0 GHz. Calculate how many clock cycles it completes in 2 seconds.
- 27th December 1975A 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.
- 28th December 1975Describe what a nested loop does when it processes a 2D array.
- 29th December 1975A mono sound clip has a sample rate of 4000 Hz and lasts 2 seconds. Calculate the total number of samples taken.
- 30th December 1975State the type of program that is typically stored in ROM.
- 31st December 1975State one reason a small business might choose to use open source software instead of proprietary (closed source) software.