Memory and Storage

A Binary Coded Decimal (BCD) digit is represented using 4 bits, as each decimal digit (0-9) is encoded in a 4-bit binary form.

Computers store data in binary form because they operate using two states (0 and 1), which correspond to electrical off and on states. Decimal, hexadecimal, and octal are number systems used for human readability or programming convenience, but the underlying storage is binary.

1 KB (kilobyte) is equal to 1024 bytes, which is the standard definition in computing. 1 MB (megabyte) equals 1024 KB, not 1024 bytes, and 1 KB is not equal to 8 bytes. Therefore, option B is the correct statement.

A bit is the basic unit of information in computing and can have one of two values: 0 or 1. The term '1 or 0' correctly reflects this binary nature, whereas '1 and 0' or '1 only' are incorrect. 'Memory' is unrelated to the definition of a bit.

One kilobyte (KB) is defined as 1024 bytes in computer science, based on the binary system where 1 KB = 2^10 bytes. Therefore, option B (1024) is correct.

1 Gigabyte (GB) is equal to 1024 Megabytes (MB) in the binary system commonly used in computer science. Therefore, option B is correct.

One byte consists of 8 bits, which is a standard unit of digital information storage in computer science.

Among the given options, Yottabyte is the largest unit of digital storage, followed by Zettabyte, Petabyte, and Terabyte. Yottabyte represents 10^24 bytes, making it the largest unit listed.

A nibble is a sequence of 4 bits. A byte consists of 8 bits, a kilobyte is 1024 bytes, and a megabyte is 1024 kilobytes, so the correct answer is 'Nibble'.

A combination of 16 bits is called a Word in computer terminology. A Bit is a single binary digit, a Nibble is 4 bits, and 1024 Bits is not a standard term for 16 bits.

A 'bit' stands for 'binary digit,' which is the most basic unit of data in computing, representing a 0 or 1. Therefore, the correct term for 'bit' is 'Binary Digit.'

One Megabyte (MB) is commonly defined in two ways: the decimal definition where 1 MB = 1,000,000 bytes (10^6 bytes), and the binary definition where 1 MB = 1,048,576 bytes (2^20 bytes). The binary definition is often used in computer memory contexts and corresponds to 1024 Kilobytes (KB), where 1 KB = 1024 bytes. Therefore, one Megabyte is equal to 1024 Kilobytes, not 1024 Bytes. Option B (1024 Kilo Bytes) is the correct answer in the binary context, which is the common usage in computer science for memory sizes. Option A (1024 Bytes) is incorrect because 1024 Bytes equals 1 Kilobyte, not 1 Megabyte. The other options are incorrect or incomplete.

A bit is the smallest unit of data storage in computing, representing a binary value of 0 or 1. Nibble, byte, and megabyte are larger units composed of multiple bits.

A half-byte consists of 4 bits and is commonly known as a nibble in computer science. This term is standard and widely accepted.

SATA (Serial ATA) is the standard bus interface commonly used to connect storage devices such as hard drives and SSDs to the motherboard. PCIe and USB serve different purposes, and Parallel Bus is outdated for this use.

After execution, the result is typically stored in a register, which is a small, fast storage location within the CPU. The ALU performs the operation, but the result is saved in a register before it may be moved to memory if needed.

IBM invented the first hard disk drive in 1956, known as the IBM 350 Disk Storage Unit, making IBM the correct answer.

Cache memory is a small, high-speed memory located close to the CPU that stores frequently used data and instructions. It reduces the time needed for the CPU to access data from the main memory, thereby improving overall processing speed. RAM, ROM, and EPROM do not function as high-speed intermediary storage between CPU and memory.

PROM (Programmable Read-Only Memory) is a type of non-volatile memory, meaning it retains data even when the power is turned off. RAM, DRAM, and registers are volatile memories that lose their data when power is removed.

Content-Addressable Memory (CAM) is designed for very high-speed searching because it allows data to be retrieved based on content rather than specific addresses. This makes it much faster for search-intensive applications compared to traditional memory types like RAM or flash memory.

Dynamic RAM (DRAM) stores data using capacitors that gradually lose charge, so it must be refreshed repeatedly every few milliseconds to retain information. In contrast, SRAM, ROM, and EPROM do not require constant refreshing. This makes DRAM slower but more cost-effective for main memory.

Floppy disk is the slowest among the given storage devices because it has very low data transfer rate and higher access time compared to hard disks and zip disks. Hard disks and zip disks are faster and more advanced magnetic storage devices.

A disk (such as a hard disk or floppy disk) is a secondary memory device used for non-volatile, long-term data storage. The keyboard is an input device, and ALU (Arithmetic Logic Unit) is a component of the CPU, neither of which is a secondary memory device.

RAM (Random Access Memory) temporarily holds both data and instructions that the CPU needs while performing tasks, making it the correct answer. Hard Disk stores data permanently, BIOS contains firmware instructions, and Task Manager is a system utility, not a storage component.

Compact disks (CDs) use laser technology to read and write data by reflecting a laser beam off the disk's surface, which contains encoded information in the form of tiny pits and lands.