Test Knowledge About Computer Hardware Quiz

The data bus carries information between processors and peripherals. It is responsible for transmitting data and instructions between different components of a computer system. The data bus is a bi-directional bus, meaning it can transfer data in both directions. This allows the processor to send data to peripherals such as memory, storage devices, and input/output devices, and also receive data from them. Therefore, the data bus is the correct answer for this question.

RAM stands for Random Access Memory. It is a type of computer memory that is volatile, meaning its contents are lost when the computer is switched off. This is in contrast to ROM (Read-Only Memory) chips, which retain their contents even when the power is turned off. DRAM (Dynamic Random Access Memory) chips are a specific type of RAM that store data in capacitors, requiring constant refreshing to maintain the data. Therefore, the correct answer is RAM chips, as their contents are indeed lost when the computer is switched off.

The ALU (Arithmetic Logic Unit) is the part of the computer that performs arithmetic calculations. It is responsible for executing mathematical operations such as addition, subtraction, multiplication, and division. The ALU is a crucial component of the CPU (Central Processing Unit) and is designed to process numerical data efficiently and accurately. It works in conjunction with other components like registers to store temporary data and the logic bus to transmit signals between different parts of the computer.

ROM chips are responsible for storing permanent data and instructions. Unlike RAM chips, which are volatile and lose their data when power is turned off, ROM chips retain their data even when power is disconnected. This makes them ideal for storing important instructions and data that need to be permanently stored and accessed by the computer. DRAM chips, on the other hand, are a type of RAM and are not used for permanent storage.

The control bus is responsible for controlling the sequencing of read/write operations. It carries control signals that determine when and how data is transferred between the CPU and other components of the computer system. These control signals include signals for initiating read or write operations, selecting memory or I/O devices, and coordinating the timing of these operations. Therefore, the control bus is the bus that controls the sequencing of read/write operations.

A scanner is a device that can convert physical documents, such as a printed copy, into digital files. In this scenario, since the person has mistakenly deleted all their files on the computer but has a printed copy, they can use a scanner to scan the printed documents and create digital copies. These digital copies can then be saved on the computer, allowing the person to rectify the problem of deleted files. The other options, such as a camera, printer, OMR, or keyboard, do not have the capability to convert physical documents into digital files like a scanner does.

The correct answer is Control Unit. The control unit is responsible for directing and coordinating all activities within the computer. It fetches instructions from memory, decodes them, and then executes them by sending signals to the appropriate components. It controls the flow of data between the CPU, memory, and input/output devices, ensuring that instructions are executed in the correct order and that data is transferred accurately. Without the control unit, the computer would not be able to perform any tasks or operations.

RAM chips are said to be volatile because they require a constant power supply to retain data. Volatile memory means that the data stored in it is lost when the power is turned off or interrupted. RAM (Random Access Memory) is a type of volatile memory that is used for temporary storage and quick access to data by the computer's processor. It allows for fast read and write operations, but the data is lost once the power is removed.

Registers are small high-speed memory units used for storing temporary results in a CPU. They are located within the CPU and are designed to hold data that needs to be quickly accessed and manipulated. Registers are used to store operands, intermediate results, and memory addresses during the execution of instructions. They play a crucial role in improving the overall performance and efficiency of the CPU by reducing the time required to access data from main memory.

A serial port is a type of port that transmits data one bit at a time. Unlike parallel ports, which transmit multiple bits simultaneously, serial ports transmit data sequentially, making them suitable for slower data transfer rates. USB ports, on the other hand, can transmit multiple bits simultaneously, and parallel ports are also capable of transmitting multiple bits at once. Therefore, the correct answer is the serial port.