Computer Science - Aqa A Level 1 Test With Complete Solution.

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With Complete Solution n n n




Arithmetic Logic Unit (ALU) - correct answer-The part of the central processing unit
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that performs arithmetic computations and logical operations
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Control Unit - correct answer-Coordinates activities in the CPU, memory and
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peripherals
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Clock - correct answer-A continuous sequence of clock pulses to step the control
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unit through its operations
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Registers - correct answer-Very fast memory stored on or near the processor
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Program Counter (PC) - correct answer-Holds the address of the next instruction to
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be executed
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Current Instruction Register (CIR) - correct answer-Stores the current instruction (in
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binary)
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Memory Address Register (MAR) - correct answer-Holds the address of a memory
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location from which data will be read or data will be written to
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Memory Buffer Register (MBR) - correct answer-Temporarily stores the data read
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from or written to memory
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Status Register (SR) - correct answer-Contains many bits that are set (1) or cleared
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(0) depending on the result of an instruction
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Clock Speed - correct answer-The frequency at which the system clock ticks
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, Bus Width - correct answer-The number of parallel signal lines or wires allocated to
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a bus
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Word Length - correct answer-The number of digits in a binary word
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Cache Memory - correct answer-A small amount of very fast memory
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Increasing Clock Speed - correct answer-Reduces the time taken to execute
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instructions
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Increasing Word Length - correct answer-Registers can store more bits and the
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processor can process more bits in one go
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Increasing Data Bus Width - correct answer-Enables more bits to be transferred
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between main memory and the processor at one time
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Increasing Address Bus Width - correct answer-Enables the processor to access a
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larger number of main memory locations meaning it will not need to make as much
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use of secondary storage
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Increase Amount Of Cache Memory - correct answer-Increases speed and
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response time as more can be stored in cache memory and main memory needs to
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be accessed less often
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Multicore Processors - correct answer-Increases throughput but greatly increases
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complexity and heat production
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Increase The Number Of General Purpose Registers - correct answer-More
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intermediate results/variables can be kept in processor registers instead of main
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memory
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Radio Frequency Identification (RFID) - correct answer-A form of contactless
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identification which uses radio waves to transmit and receive data
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Digital Camera - correct answer-A type of camera that is able to save images and
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videos digitally, normally to an SD card or other form of EMMC storage
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Barcode Reader - correct answer-A device used to read a small pattern of black and
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white parallel lines and numbers, also known as a barcode
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Laser Printer - correct answer-A type of printer that uses electrical charges to create
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an image on paper
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Hard Drives - correct answer-A non-volatile, magnetic form of internal or external
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storage, that permanently stores and retrieves data on a computer
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Solid State Drive (SSD) - correct answer-A non-volatile type of mass storage similar
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to a hard drive that supports reading and writing data, and stores data even without
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power
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