Memory and Storage

Hard disk drives (HDDs) are non-volatile storage devices, meaning they retain data even when the power is turned off. This makes them suitable for long-term data storage compared to temporary (volatile) memory like RAM.

Disk drives and tape drives are used to store data permanently or for long periods of time. Therefore, they are classified as secondary storage devices in a computer system.

A hard disk is divided into concentric circles called tracks, which are further subdivided into smaller units called sectors. Sectors are the smallest physical storage units on a disk.

A DVD (Digital Versatile Disc) is an example of an optical disc, which uses laser technology to read and write data. It is not a hard disk, output device, or solid-state storage device.

A standard CD-ROM typically stores up to 680 MB of data. The other options are either too small or too large for a normal CD-ROM's capacity.

An antivirus program scans the device to detect (identify) and remove (eliminate) computer viruses. Option C accurately describes all the main functions of an antivirus program.

Printers are output devices, not storage devices. Hard disk drives, floppy disk drives, and CD drives are all used to store data.

After a PROM (Programmable Read-Only Memory) is programmed, its data cannot be changed or erased; it can only be read. This is why it is called 'read-only' memory.

A megabyte is smaller than a gigabyte and a terabyte. Therefore, among the given options, megabyte is the smallest unit of storage.

Cache memory works on the principle of locality of reference, which means that programs tend to access the same set of memory locations repetitively over a short period of time. This principle helps cache memory to predict and store frequently accessed data for faster retrieval.

A petabyte is larger than a terabyte, megabyte, or kilobyte. The order from smallest to largest is kilobyte, megabyte, terabyte, and then petabyte.

RAM (Random Access Memory) is a type of volatile memory, meaning it loses all stored data when the power is turned off. The other options—ROM, Floppy Disk, and Hard Disk—are non-volatile and store data permanently.

In a computer memory hierarchy, most data is first accessed by the CPU from the cache, which is the fastest and closest memory to the processor. Cache memory is used to temporarily store frequently accessed data for quick retrieval.

In computing, 1 megabyte (MB) is commonly defined as 1024 kilobytes (KB) in the binary system used by most operating systems. Since 1 KB = 1024 bytes, this makes 1 MB = 1024 × 1024 bytes. Although decimal systems may use 1000 KB, the standard computer-based definition is 1024 KB.

1 KB (Kilobyte) is equal to 1024 bytes. This is the standard binary definition used in computing, where 1 kilobyte equals 2^10 bytes.

There are two common definitions for 1 Gigabyte (GB): In the binary system (used by most operating systems), 1 GB equals 1024 Megabytes (MB). In the decimal system (used by most storage device manufacturers and the SI standard), 1 GB equals 1000 MB. Since the question and options align with the binary definition, the correct answer is 1 GB = 1024 MB (option D). Options A, B, and C are incorrect as they do not represent valid conversions for 1 GB.

1 GB (gigabyte) is commonly considered as 1,000,000,000 bytes (1 billion bytes) in the decimal (SI) system, which is the standard in most contexts outside of computer memory (where 1 GB can mean 1,073,741,824 bytes).

1 Byte is equal to 8 bits. This is a standard unit of digital information in computing and telecommunications.

8 bits make up a byte. This is a standard unit of digital information in computing and telecommunications.

1 KB (Kilobyte) is equal to 1024 bytes. This is a standard unit of digital information storage in computing, where 1 KB = 1024 bytes.

1 GB (gigabyte) is equal to 1,000,000,000 bytes (1 billion bytes) in the decimal system, which is commonly used for storage devices. Therefore, 5 GB is 5 billion bytes.

A nibble is equal to 4 bits. Therefore, 4 nibbles equal 16 bits. Since 1 byte is 8 bits, 16 bits equal 2 bytes.

A nibble is a unit of digital information that consists of 4 bits. Therefore, 1 nibble equals 4 bits.

The term 'Gigabyte' has two common definitions: In the decimal (SI) system, 1 Gigabyte (GB) equals 1,000 Megabytes (MB). In the binary system, often used in computing memory contexts, 1 Gigabyte equals 1,024 Megabytes. The question's answer 'D' (1024 megabytes) is correct under the binary system, which is the standard used in many computing contexts for data storage units. Other options are incorrect: A (1024 bits) is far too small, B (1032 megabytes) is incorrect, and C (1024 kilobytes) is incorrect as 1 GB = 1024 MB, not KB.

Among the options given, a terabyte (TB) is the largest unit of memory. It is larger than a gigabyte (GB), megabyte (MB), and kilobyte (KB).