Daily Practice · GCSE Computer Science
January 2009 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in January 2009, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in January 2009
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st January 2009A 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.
- 2nd January 2009Convert the hexadecimal number 3F to denary.
- 3rd January 2009Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
- 4th January 2009Explain the purpose of a breakpoint.
- 5th January 2009Convert the denary number 45 to hexadecimal.
- 6th January 2009What does the acronym CPU stand for?
- 7th January 2009State what the term malware means.
- 8th January 2009Explain why a running maximum should be initialised to the first element of the array rather than to 0.
- 9th January 2009An 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).
- 10th January 2009Which of RAM and ROM is volatile, meaning its contents are lost when the power is removed?
- 11th January 2009Which piece of UK legislation controls how organisations must store and use people's personal data?
- 12th January 2009Given x = 5 and y = 8, state whether x < y AND x > 0 evaluates to True or False.
- 13th January 2009A 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.
- 14th January 2009Give one reason why RAM on its own is not enough, and a computer also needs secondary storage.
- 15th January 2009Name the four layers of the TCP/IP model in order from the one closest to the user.
- 16th January 2009A password field requires between 6 and 12 characters. State two boundary data values that should be used to test this field.
- 17th January 2009A table called bookings has fields bookingId, customerName and eventDate. Write an SQL statement that deletes the booking with bookingId 45.
- 18th January 2009State one function carried out by the operating system of a computer.
- 19th January 2009In computational thinking, what is meant by the term 'decomposition'?
- 20th January 2009Given A = 1 and B = 1, state the value of A AND B.
- 21st January 2009Convert the denary number 39 to an 8-bit binary number, showing your working.
- 22nd January 2009Define a peer-to-peer network.
- 23rd January 2009A 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.
- 24th January 2009Convert the denary number 5 to a 4-bit binary number.
- 25th January 2009A CPU has a clock speed of 4.0 GHz. Calculate how many clock cycles it completes in 2 seconds.
- 26th January 2009A 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.
- 27th January 2009An array named temps holds 12 values. State the index of the first item and the index of the last item.
- 28th January 2009A mono sound clip has a sample rate of 4000 Hz and lasts 2 seconds. Calculate the total number of samples taken.
- 29th January 2009State the type of program that is typically stored in ROM.
- 30th January 2009State one reason a small business might choose to use open source software instead of proprietary (closed source) software.
- 31st January 2009A FOR loop runs: total = 0, FOR i = 1 TO 4, total = total + i, NEXT i. State the value of total after the loop finishes.