Daily Practice · GCSE Computer Science
November 1990 5-a-day
Every sheet in November 1990
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st November 1990Name the four layers of the TCP/IP model in order from the one closest to the user.
- 2nd November 1990A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
- 3rd November 1990A 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.
- 4th November 1990A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
- 5th November 1990An array contains [9, 2, 6], to be sorted using insertion sort. Show the state of the array after each new element has been inserted into its correct position.
- 6th November 1990Complete: NOT 0 = ?
- 7th November 1990Convert the denary number 200 to hexadecimal, showing your working.
- 8th November 1990State what LAN stands for.
- 9th November 1990A 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.
- 10th November 1990An 8-bit register stores the value 01100000 (denary 96). State the resulting 8-bit binary value after a left shift by 1 place, and state whether an overflow occurs.
- 11th November 1990Which CPU register holds the address of the next instruction to be fetched?
- 12th November 1990Distinguish between the network security threats known as phishing and pharming.
- 13th November 1990An array named temps holds 12 values. State the index of the first item and the index of the last item.
- 14th November 1990A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 15th November 1990A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 16th November 1990A streaming company records which shows each user watches and uses this to recommend similar shows. Explain one ethical concern this could raise, even if the company only uses the data to improve recommendations.
- 17th November 1990State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 18th November 1990State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
- 19th November 1990Give one example of an optical secondary storage device.
- 20th November 1990State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
- 21st November 1990State the term used for realistic data that a program would be expected to handle during normal use.
- 22nd November 1990Define the term 'primary key' as used in a database table.
- 23rd November 1990State the difference between lossy and lossless compression.
- 24th November 1990State the condition that must be met before a binary search can be used on an array.
- 25th November 1990A 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.
- 26th November 1990Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
- 27th November 1990Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
- 28th November 1990State why a program written in a high level language must be translated.
- 29th November 1990Convert the denary number 45 to hexadecimal.
- 30th November 1990What does the acronym CPU stand for?