Daily Practice · GCSE Computer Science
September 1975 5-a-day
Every sheet in September 1975
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st September 1975Explain why an interpreter is often preferred while a program is being written.
- 2nd September 1975Convert the denary number 5 to a 4-bit binary number.
- 3rd September 1975A CPU has a clock speed of 4.0 GHz. Calculate how many clock cycles it completes in 2 seconds.
- 4th September 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.
- 5th September 1975A 2D array grid is declared as grid[4][6]. State how many rows and columns it has and how many elements it holds in total.
- 6th September 1975A mono sound clip has a sample rate of 4000 Hz and lasts 2 seconds. Calculate the total number of samples taken.
- 7th September 1975State the type of program that is typically stored in ROM.
- 8th September 1975State one reason a small business might choose to use open source software instead of proprietary (closed source) software.
- 9th September 1975A FOR loop runs: total = 0, FOR i = 1 TO 4, total = total + i, NEXT i. State the value of total after the loop finishes.
- 10th September 1975State the key difference between a procedure and a function.
- 11th September 1975State the typical maximum capacity of a single-layer DVD.
- 12th September 1975State the layer that IP operates in, and describe its job.
- 13th September 1975State what is meant by a syntax error.
- 14th September 1975Give one advantage of a relational database over a flat-file database.
- 15th September 1975What type of utility software reorganises files on a hard disk so fragmented parts are stored closer together?
- 16th September 1975Calculate the maximum number of comparisons required by a binary search on a sorted list of 512 items.
- 17th September 1975Given P = 0 and Q = 1, state the value of P OR Q.
- 18th September 1975Convert the hexadecimal number 3F to denary.
- 19th September 1975A network administrator is connecting 10 computers in a server room. Calculate the number of cables needed for a full mesh topology, and state the number needed for a star topology with one central switch.
- 20th September 1975Describe what syntax highlighting is and how it helps a programmer.
- 21st September 1975Convert the 4-bit binary number 1101 to denary.
- 22nd September 1975Two CPUs are compared for a task optimised for multiple cores: CPU A has 2 cores at 4.2 GHz; CPU B has 6 cores at 3.0 GHz. Explain which CPU is likely to perform better for this task.
- 23rd September 1975State why an organisation might employ penetration testers to test its network.
- 24th September 1975Trace this algorithm with data = [4, 9, 2, 9, 7] and state the final output. total = 0; count = 0; for i = 0 to 4: if data[i] > 5 then total = total + data[i] and count = count + 1; next i; print(total, count).
- 25th September 1975State one example of a file format that commonly uses lossy compression.
- 26th September 1975State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
- 27th September 1975State whether the source code of proprietary (closed source) software is normally available for the public to view.
- 28th September 1975Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
- 29th September 1975A programmer wants any syntax error in their program to be reported before the program starts running at all. State whether a compiler or an interpreter behaves this way, and explain why.
- 30th September 1975Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.