Y10 - Summer PPE

Convert the denary number 45 to 8-bit binary.

• 00101101

• 00101011

• 00101110

• 00101010

Convert the binary number 0110 1010 to hexadecimal.

• 6A

• 6B

• 7A

• 7B

Describe the process of converting a binary number to two’s complement.

• Flip all the bits and add one

• Copy all the 1s and add zero

• Flip all the bits and subtract one

• Copy all the 0s and subtract one

When a file is compressed and some data is lost in the process, what type of compression is being used?

• Lossy

• Lossless

• Reversible

• Non-reversible

Data can be encoded using ASCII. Describe ASCII.

• A standard for representing text/characters, allowing data to be interchangeable between computers.

• A method for compressing data to save space.

• A protocol for secure data transmission over the internet.

• A type of hardware used for data storage.

Two images are displayed on the same screen. One image is 1024 × 768 pixels. The second image is 2560 × 1440 pixels. The second image has a higher resolution. State one reason why the second image will be displayed in more detail.

• A. The number of pixels per square inch is higher

• B. The number of colors is higher

• C. The screen size is larger

• D. The image format is different

Perform a logical binary shift left of two positions on the 8-bit binary pattern 1101 0011.

• 0100 1100

• 1010 0110

• 0011 0100

• 1100 1100

Perform an arithmetic binary shift left of one position on the 8-bit binary, two’s complement pattern 0110 1011.

• 1101 0110

• 0011 0101

• 1110 1010

• 0110 1010

The ASCII code for the digit ‘5’ is 53. Give the ASCII code for the digit ‘3’.

• 51

• 53

• 55

• 57

Which of the following is a limitation of ASCII?

• ASCII can store 256 unique characters.

• ASCII is only 7 bits, so can only store 128 unique characters.

• ASCII can represent all characters in all languages.

• ASCII does not need more bits to represent some alphabets.