Computer Science AQA A-Level Paper 2 Practice

What subcategory of software does a virus checker belong to.

• Operating System

• Translators

• Utilities

• Defragmentation

Which of the following is not a resource managed by an operating system?

• Processor

• Memory

• I/O Devices

• Allocating Files on Secondary Storage

• Provides Virtual Machine

Which layer of the TCP/IP stack determines which application layer software on the server should deal with a received request by using port numbers?

• Application

• Transport

• Network

• DataLink

In the case of dictionary compression, a dictionary ...

• acts as a reference for a particular subject.

• maps sequences of characters onto values.

• is an electronic resource that lists words and gives their meaning.

• is a set of words or other text strings made for use in applications such as spellcheckers or brute-force attacks.

In a DBMS, when a user starts to edit a record, others are prevented from accessing the record for the duration of the editing. What is this called?

(a)  

Which form of transmission results in the clocks for the receiver and transmitter synchronising for the duration of a transmission?

(a)  

Calculate the decimal equivalent of the normalised floating point representation number with an 8-bit mantissa and a 4-bit exponent, both stored using two’s complement.

1.0110010 0010

(a)  

With an 8 bit mantissa and a 4 bit exponent, write the normalised floating point representation of the decimal value 0.15625

(a)  

A particular computer system uses a 32-bit address bus and a 32-bit data bus. What is the maximum amount of memory, in bytes, that could be accessed?

(a)  

Decrypt the ciphertext "QGOZRKT" using the Caesar cipher with the settings shown in the image.

(a)