Review/Revisions-Paper 1

Output devices are used to output data from a computer.

Click three devices that are output devices.

 

• actuator

• digital versatile disk (DVD)

• keyboard

• printer

• speaker

Binary numbers can be converted to hexadecimal.

 Convert the given binary numbers to hexadecimal and click the correct answer

10010011

• OD

• 0D

• 93

• 39

Answer explanation

To convert the binary number 10010011 to hexadecimal, we can group the binary digits into groups of four starting from the right and then convert each group to its corresponding hexadecimal digit.

Binary: 1001 0011

Now, let's convert each group:

1. 1001 = 9 in hexadecimal

2. 0011 = 3 in hexadecimal

So, the hexadecimal representation of the binary number 10010011 is 93.

Therefore, the correct answer is: 93

A value is stored as a binary number in a register.

A logical right shift of three places is performed on the binary number.

 

Get the binary register that will show after this logical right shift.

• 00001111

• 00011111

• 00000111

• 000011111

Answer explanation

A logical right shift operation involves shifting all the bits in a binary number to the right by a certain number of places, with vacant bit positions filled in with zeros. In this case, we are performing a logical right shift of three places on the binary number 01111010.

•Logical right shift by three places:

•Shift all bits three places to the right:The three rightmost bits are shifted out, leaving: 00001111

•Fill in the vacated leftmost bits with zeros: Since we're shifting right, we fill in with zeros on the left: 00000011

So, after performing the logical right shift of three places on the binary number 01111010, we get the binary number 00000111.

Therefore, the binary register after this logical right shift will be: 00000111

Choose two effect of logical shift has on the binary number.

• Easier/quicker to understand/read/write

• Easier/quicker to debug

• It is divided by 8

• Less likely to make a mistake

• The value becomes incorrect/inaccurate as the right most bits are lost

Click ALL which you think is the reasons why a programmer may use hexadecimal to represent binary numbers.

• The value becomes incorrect/inaccurate as the right most bits are lost

• Shorter representation // Takes up less screen space

• It is divided by 8

• Less likely to make a mistake

• Easier/quicker to debug

When keys are pressed on a keyboard, the text is converted to binary to be processed by the computer.

Click three on how the text is converted to binary to be processed by the computer.

• A compression algorithm is used

• A character set is used

• Each character has a unique binary value

• Repeating words/characters/phrases are identified // Patterns are identified

• … such as Unicode/ASCII

(Text that is input into a computer can be stored in a text file.

 

A text file can be compressed using lossless compression.

Click the effect this has on the file size.

 

• It reduces the file size

• A character set is used

• Each character has a unique binary value

• Repeating words/characters/phrases are identified // Patterns are identified

• … such as Unicode/ASCII

Choose that BEST describes LOSSLESS COMPRESSION compresses the text file.

• A compression algorithm is used

• A character set is used

• Each character has a unique binary value

• Repeating words/characters/phrases are identified // Patterns are identified

• … such as Unicode/ASCII

Choose two reasons why the text file may have been compressed.

• To save storage space

• To make it quicker to transmit

• To make bigger enough to attach to an email

• To enhance the bandwidth needed to transmit