DP Computer Science Questionbank

Calculate the denary (base 10) equivalent of the hexadecimal number BF.

Construct the truth table for the following logic circuit:

Draw the logic circuit represented by the following truth table.

Describe how a spellchecker checks whether a word in a text file is correctly spelt or not.

Construct a logic diagram for the Boolean expression

NOT A OR B AND C.

Copy and complete the following truth table.

State one advantage of this feature.

Outline the role of the data bus and address bus in this process.

Define the term bit.

Identify two additional features of a word processing package that could be useful for this office.

Outline the purpose of one application software package other than a word processing package that could be used in this office.

Describe how a spellchecker checks whether a word in a text file is correctly spelt or not.

Outline what is meant by a database management system.

Construct a logic diagram for the following expression.

NOT A OR (A AND B) 

Distinguish between random access memory (RAM) and read only memory (ROM).

Outline the function of an operating system in managing primary memory.

State how many integers could be represented in this byte.

Outline why this byte could not be used to represent characters such as those used in Chinese.

Explain the roles of the data bus and the address bus in the machine instruction cycle.

State how the data stored in the byte will be represented in hexadecimal.

Construct a truth table with two input variables. If the input variables are equal the value of the output variable should be True, otherwise it should be False.

Copy and complete the following truth table where:

X = A XOR B
Y = A NOR C
Z = X OR NOT Y

State the number of bits used to represent a non-primary colour, such as yellow.

State the function of the control unit (CU) in the central processing unit (CPU).

State the maximum number of colours that can be represented in a computer pixel.

State why hexadecimal numbers are frequently used in computing.

Explain the purpose of cache memory.

State the hexadecimal representation of the binary number 10001010.

Construct a truth table for the following logical expression.

(A XOR B) AND NOT C

Explain how the operating system ensures that each customer’s data is secure when multiple users are accessing the data at the same time.

State where the customer data is held during the process of modifying their data.

State the part of the central processing unit (CPU) that performs the decoding.

Outline the function of the memory address register (MAR).

State where the program is held.

Calculate how many different colours can be represented using two hexadecimal characters.

Explain the importance of the memory management function of an operating system.

Outline the role of the memory data register in the machine execution cycle.

Construct a logic diagram for the following Boolean expression.

$\mathrm{NOT}$ $\mathrm{A}$ $\mathrm{OR} ($$\mathrm{A}$ $\mathrm{AND}$ $\mathrm{B}$$)$

Identify two features of a graphical user interface (GUI).

Outline the purpose of the memory address register (MAR) in the central processing unit (CPU).

State the part of the central processing unit (CPU) that is responsible for carrying out calculations.

Construct the truth table from the following logic circuit.

Identify two characteristics of RAM.

Identify two types of general application software that would be installed on the training computers.

Calculate, showing your working in each case: the hexadecimal (base 16) value of the denary (base 10) number: 200.

Identify one function of a single-user operating system.

Explain how cache memory affects system performance.

Calculate, showing your working in each case: the binary (base 2) value of the denary (base 10) number: 105.

Define the term usability. 

Draw the truth table for the following logic circuit.