Daily Practice · GCSE Computer Science
April 2011 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in April 2011, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in April 2011
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st April 2011A 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.
- 2nd April 2011Convert the denary number 5 to a 4-bit binary number.
- 3rd April 2011A CPU has a clock speed of 4.0 GHz. Calculate how many clock cycles it completes in 2 seconds.
- 4th April 2011A 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 April 2011An array named temps holds 12 values. State the index of the first item and the index of the last item.
- 6th April 2011A mono sound clip has a sample rate of 4000 Hz and lasts 2 seconds. Calculate the total number of samples taken.
- 7th April 2011State the type of program that is typically stored in ROM.
- 8th April 2011State one reason a small business might choose to use open source software instead of proprietary (closed source) software.
- 9th April 2011A 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 April 2011State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
- 11th April 2011State the typical maximum capacity of a single-layer DVD.
- 12th April 2011State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
- 13th April 2011State what is meant by a syntax error.
- 14th April 2011Define the term 'primary key' as used in a database table.
- 15th April 2011What type of utility software reorganises files on a hard disk so fragmented parts are stored closer together?
- 16th April 2011Calculate the maximum number of comparisons required by a binary search on a sorted list of 512 items.
- 17th April 2011Given P = 0 and Q = 1, state the value of P OR Q.
- 18th April 2011Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
- 19th April 2011A 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 April 2011State why a program written in a high level language must be translated.
- 21st April 2011Convert the 4-bit binary number 1101 to denary.
- 22nd April 2011Two 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 April 2011State why an organisation might employ penetration testers to test its network.
- 24th April 2011Describe what a nested loop does when it processes a 2D array.
- 25th April 2011State one example of a file format that commonly uses lossy compression.
- 26th April 2011State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
- 27th April 2011State whether the source code of proprietary (closed source) software is normally available for the public to view.
- 28th April 2011Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
- 29th April 2011A 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.
- 30th April 2011Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.