N5 Computer Systems exam questions

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​A - 153

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Convert the following 8‑bit binary number into denary. (1)  

 

1110 0010

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Convert the following 8-bit binary number into denary. (1) 

1011 1001 

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A hotel wants to replace 114 windows. Convert this denary number to 8-bit binary. (1)  

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Convert the decimal number 60 into 8-bit binary. (1) 

Open Ended

The data usage for the customer in May is 35.7 GB. This value would be stored in a computer system using floating-point representation as shown below.  

 

0.357 × 10²  

 

Identify the mantissa and exponent in the above floating-point representation.

Open Ended

The cruising speed of an aeroplane is 891.6 kilometres per hour. This value would be stored in a computer system using floating-point representation as shown below.  

 

0·8916 × 10³  

 

Identify the mantissa and exponent in the above floating-point representation. (2) 

Multiple Choice

How many bits does extended ASCII use to represent a character?

• 4

• 7

• 8

• 16

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A player enters the answer:  SERVER  

 

State how many bits would be required to store the player’s answer using extended ASCII code. (1) 

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A user enters the password: GRK_0183_J  

 

State how many bits would be required to store the password using extended ASCII code. (1) 

Multiple Choice

A vector graphics package is used to create a floor plan for a house as shown below. State the object used to create the outline of the sink. (1)

• Rectangle

• Straight line

• Polygon

• Ellipse

• Circle

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A vector graphics package is used to create a floor plan for a house as shown below. The line thickness and line colour are attributes of the lines used to draw the outside walls. State one other attribute of these lines. (1)

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The logo below is stored as a vector graphic. A polygon is one object used in this logo. State one attribute of this object. (1)

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The logo below is stored as a vector graphic. A polygon is one object used in this logo. State the name of one other object used in this logo. (1)

Open Ended

Describe how a bit-mapped graphic is represented in a computer system’s memory. (2)

Multiple Choice

State the part of the processor that will compare a selected stored word with an input from the keyboard. (1)

• Arithmetic & Logic Unit

• Control Unit

• Registers

• RAM

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State the part of the processor used to temporarily store a quiz answer. (1)

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State the part of the processor that will perform the calculation once the program is implemented. (1)

Multiple Choice

State the bus used to transfer the stored water temperature to the processor. (1)

• Address bus

• Data bus

Open Ended

Explain how a computer system organises data in memory so that it can be retrieved. (2)

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After final testing, the program is run without requiring any further translation software. State the type of translator that has been used. (1) 

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The following code displays the number of votes for each candidate.

 

…

Line 22 REPEAT 4 TIMES

Line 23 < display candidate name and number of votes >

Line 24 END REPEAT

…

 

Before the code is run it must be translated. Which translator program will result in the loop being translated four times as the program is run? (1)

Open Ended

A school wants to reduce the energy consumption of the computing department. Pupils are already encouraged to put the computers into standby mode when not in use.

 Describe two other methods to reduce the energy consumption of the computers. (2)

Open Ended

Describe one way that Sam could reduce the energy consumption of the tablet. (1)

Open Ended

The app will store passenger information. State how this information could be transferred securely from the app to the computers running the booking system. (1)

Open Ended

Explain why encryption is used when sending emails across wireless networks. (1)