Data Representation Byte size

What can be described as, 'moving each bit to the left by one and filling the vacant least significant bit with a zero and discarding the most significant bit'?

• right arithmetic shift

• left logical binary shift

• right logical binary shift

• left arithmetic shift

Answer explanation

One use of logical binary shifts is to multiply and divide unsigned binary integers by powers of two. While arithmetic binary shifts can be used to divide negative numbers, using left arithmetic shifts to implement multiplication of negative numbers does not work because the most significant bit (MSB) is not preserved. In this way a left arithmetic binary shift is identical to a left logical binary shift.

Computers can only process data in this format.

• Denaery

• ASCII

• Hexadecimal

• Binary

Why do computers need to convert data into a binary form?

• It is easy to store two states with electrical components

• To make the data easier to process

• To reduce the amount of data needed to be stored

• To make the data more secure

What can be described as, 'the extent to which air particles are displaced, experienced as the loudness of sound'?

• sample rate

• sound file size

• Frequency

• Amplitude

What is one characteristic of lossless compression?

• It is reversible

• None of the data is lost

• It is faster than lossy compression

• It reduces file size

What is the denary number 26 in hexadecimal?

• 16

• 1A

• 2A

• 10

If a bitmap image has a width of 8 pixels, a height of 8 pixels and a colour depth of 2 bits, what is its file size in bits?

• 64

• 128

• 256

• 512

ASCII is an example of…

• A programming language

• A searching algorithm

• A character set

• A software application

What is one effect of data compression?

• The file size will be reduced

• The file will be easier to access

• A file will transfer more quickly

• The file will be more secure

What is one characteristic of lossless compression?

• File can be turned back to its original format

• File size is reduced

• some data is lost

• Data is encrypted