IGCSE Computer Science Review Practice Test 2024.

IGCSE Computer Science Review Practice Test 2024. binary numbers are used in - CORRECT ANSWER computer systems conversion from denary to binary and from binary to denary uses - CORRECT ANSWER place values (128,64,32,16,8,4,2,1) memory size of a computer is measured in terms of the number of - CORRECT ANSWER bytes 1 kilobyte is - CORRECT ANSWER 2 to the 10 bytes 1 megabyte is - CORRECT ANSWER 2 to 20 bytes 1 kilobyte according to manufactures - CORRECT ANSWER 1000 bytes unit symbols - CORRECT ANSWER kilobyte-kB megabyte, gigabyte,tera byte is- CAPITAL thenB Each memory size increases by - CORRECT ANSWER 1000 so mega byte has a 1000 kilobytes so thus a 1000000 bytes and a giga byte has a 1000 mByte Why choose Hex - CORRECT ANSWER Quicker to read, easier/quicker to write in hex, less likely to make errors copying so easier to debug Letters in Hex - CORRECT ANSWER A=10 B=11 C=12 D=13 E=14 F=15 MAC addresses - CORRECT ANSWER Media Access Control address. 12-bit identification number unique for each device. Unique number that identifies a device, manufacturer ID and serial number of device, address is allocated by manufacturer Defining colours in HTML - CORRECT ANSWER Uses hexadecimal when representing colours, combinations of hex codes are used to represent different colours #FF 00 00 = primary red #00 FF 00 = primary green #00 00 FF = primary blue