N5CS: Computer Systems Test (SCHOLAR)

Convert the denary number 229 to an 8 bit binary number.

• 11100101

• 10110101

• 11110011

• 10101010

Answer explanation

To convert 229 to an 8-bit binary number, divide 229 by 2 repeatedly and note the remainders. The remainders in reverse order give 11100101.

Convert the denary number 104 to an 8 bit binary number.

• 01100011

• 11111110

• 01101000

• 00010110

Answer explanation

To convert 104 to an 8-bit binary number, divide 104 by 2 repeatedly. The remainders in reverse order give 01101000.

The denary equivalent of the binary number 10111110 is _____.

The speed of light is often written as 3 x 10^8.

In this example, which number is the mantissa?

• 10^8

• 3

• 8

• 10

Answer explanation

The mantissa is the main part of a number in scientific notation, which in this case is 3. Therefore, the correct choice for the mantissa is 3.

The speed of light is often written as 3 x 10^8.

In this example, which number is the exponent?

• 10^8

• 3

• 8

• 10

Answer explanation

The correct choice is 8 because it is the exponent in the expression 3 x 10^8, representing the speed of light.

Which group of code numbers in extended ASCII are used for the non-printing (control) characters?

• 0-31

• 32 only

• 33-47

• 65-90

Answer explanation

The correct group of code numbers in extended ASCII used for non-printing (control) characters is 0-31. These values represent characters such as carriage return, line feed, and others that are not displayed visibly.

A bitmap graphic file:

• consists of details stored in binary about shapes and lines.

• is a 2D array of small squares called pixels with a binary number representing each pixel's colour value.

• uses only black and white pixels to represent images.

• uses objects and attributes to store details of the image in binary.

Answer explanation

A bitmap graphic file is a 2D array of small squares called pixels with a binary number representing each pixel's colour value, making it the correct choice.

Which of the following is not an advantage of using bitmap images?

• They can capture photographic images.

• They take less storage space than vector graphics.

• You can edit images at individual pixel level.

• There are a high number of standard file formats for exchanging images.

Answer explanation

The correct choice is that bitmap images do not take less storage space than vector graphics, which is an advantage of using vector graphics.

How does a vector graphic store an image digitally?

• Using a series of objects and attributes.

• Using a grid of pixels.

• Using mantissas and exponents.

• Using metadata.

Answer explanation

A vector graphic stores an image digitally using a series of objects and attributes, allowing for scalability and flexibility in resizing without losing quality.

Which of the following are possible object attributes of a vector image?

• Line thickness, line, rectangle.

• Rectangle, ellipse, line, polygon.

• Coordinates, fill colour, line colour.

• Square, size, colour, location.

Answer explanation

Coordinates, fill colour, and line colour are possible object attributes of a vector image, allowing for precise positioning and styling of shapes.