Daily Practice · GCSE Computer Science
July 1999 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in July 1999, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in July 1999
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st July 1999Convert the denary number 156 to an 8 bit binary number.
- 2nd July 1999Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
- 3rd July 1999Explain what happens if a program tries to read index 5 of an array declared with 5 elements.
- 4th July 1999An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
- 5th July 1999A CPU's cache has a hit rate of 80%. During a task the CPU makes 4000 requests for data. Calculate the number of cache hits and cache misses.
- 6th July 1999Describe two negative consequences of throwing away old computer hardware instead of recycling it.
- 7th July 1999Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
- 8th July 1999Give one specific way this code could be refined without changing what it does: a = 5, b = 3, c = a + b, PRINT c
- 9th July 1999A company backs up its files onto magnetic tape cartridges, each with a capacity of 3 TB. The company needs to back up 20 TB of data. Calculate the minimum number of cartridges needed.
- 10th July 1999Define the term protocol.
- 11th July 1999Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
- 12th July 1999A table called members has fields memberId, firstName, lastName and joinYear. Write an SQL statement that adds a new record with memberId 12, firstName 'Priya', lastName 'Shah' and joinYear 2026.
- 13th July 1999Define the term 'interrupt' as used to describe a signal received by a CPU.
- 14th July 1999An array called items contains [12, 45, 7, 30, 19] at indices 0 to 4. Describe how a linear search would locate the value 30, stating the number of comparisons needed.
- 15th July 1999Evaluate X = NOT A AND B when A = 0 and B = 1.
- 16th July 1999Convert the hexadecimal number FF to an 8-bit binary number.
- 17th July 1999Give one advantage of a star topology compared with a mesh topology.
- 18th July 1999Explain the purpose of a breakpoint.
- 19th July 1999Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
- 20th July 1999State the three stages of the fetch-decode-execute cycle in the order they occur.
- 21st July 1999State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
- 22nd July 1999Explain why a running maximum should be initialised to the first element of the array rather than to 0.
- 23rd July 1999Define the term 'pixel'.
- 24th July 1999Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
- 25th July 1999Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
- 26th July 1999Evaluate the expression 23 DIV 4.
- 27th July 1999State the correct order of the three operations used to read data from a text file.
- 28th July 1999A 1 TB hard disk drive costs 40 pounds. A 500 GB solid-state drive costs 60 pounds. Calculate the cost per gigabyte of each device, and state which is cheaper per GB. Use 1 TB = 1000 GB.
- 29th July 1999Name the four layers of the TCP/IP model in order from the one closest to the user.
- 30th July 1999A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
- 31st July 1999A table called products has fields productId, name, price and stock. Write an SQL statement that changes the price of the product with productId 7 to 15.99.