Computer Fundamentals

Magnetic tape secondary storage devices follow(s) the sequential mode of access.

CD-ROM (Compact Disc Read-Only Memory) uses optical technology - a laser reads microscopic pits on the disc surface. This distinguishes it from magnetic disks (like floppy/hard disks) that use magnetic patterns. Magneto-optical disks combine both technologies. CD-ROM is the classic example of optical storage technology.

Average access time for hard disk drives typically ranges from 9 to 14 milliseconds. Values like 60-70 ms are far too slow for standard drives.

John Napier is credited with the invention of logarithms in the early 17th century. His work significantly simplified complex mathematical calculations.

The Central Processing Unit (CPU) is often referred to as the brain or the administrative section of the computer because it manages and executes instructions.

UNIVAC (Universal Automatic Computer) is widely recognized as one of the first commercial electronic computers, belonging to the first generation of computers that used vacuum tubes.

The Arithmetic Logic Unit (ALU) is the part of the CPU responsible for performing all mathematical calculations and logical comparisons.

The EDVAC (Electronic Discrete Variable Automatic Computer) was one of the earliest computers to implement the stored-program concept proposed by John Von Neumann.

Correct answer is (4). 

To convert 231 to binary: 231 / 2 = 115 R 1; 115 / 2 = 57 R 1; 57 / 2 = 28 R 1; 28 / 2 = 14 R 0; 14 / 2 = 7 R 0; 7 / 2 = 3 R 1; 3 / 2 = 1 R 1; 1 / 2 = 0 R 1. Reading remainders from bottom to top gives 11100111.

EBCDIC (Extended Binary Coded Decimal Interchange Code) is an 8-bit character encoding used primarily on IBM mainframe computers, capable of representing 256 (2^8) characters.

In octal addition: 5 + 5 = 10 (decimal), which is 12 in octal (write 2, carry 1). Then 2 + 1 + 1 (carry) = 4. Result is 42.

A NAND gate is the inverse of an AND gate. It outputs 0 only when all inputs are 1; otherwise, if any input is 0, the output is 1.

Subtracting 56 from 427 in hexadecimal: 7 - 6 = 1. For the next digit, 2 - 5 requires borrowing. Borrowing 1 from 4 makes it 12 (hex) - 5 = 18 (decimal) - 5 = 13 (decimal), which is D in hex. The remaining 3 is brought down. Result is 3D1.

NAND and NOR gates are called universal gates because any other logic gate (AND, OR, NOT) can be constructed using only combinations of these gates.

In computing, 1 terabyte (TB) is defined as 1024 gigabytes (GB).

The order of memory sizes from smallest to largest is: Kilobyte, Megabyte, Gigabyte, Terabyte. Therefore, Kilobyte is the smallest.

Access time is the time interval between the request for data and the moment the data is actually available for use.

SDRAM (Synchronous DRAM) is designed to synchronize with the system clock, allowing it to manage memory access more efficiently than older asynchronous DRAM types.

EPROM (Erasable Programmable Read-Only Memory) can be erased by exposing the chip to strong ultraviolet light through a quartz window.

EEPROM (Electrically Erasable Programmable Read-Only Memory) allows individual bytes to be erased and rewritten using an electric field, without needing to remove the chip.

Cache memory is a small, high-speed memory located close to or inside the processor, making it the most accessible memory for the CPU.

The 1's complement is found by flipping all bits: 11001011 becomes 00110100.

A NOT gate takes a single input and produces the opposite output, which is why it is commonly referred to as an inverter.

Cache memory is integrated directly into or very near the CPU to provide extremely fast access times. Because of this speed and the specialized manufacturing process required, it has the highest cost per bit compared to main memory or secondary storage.

VRAM (Video RAM) is a specialized type of DRAM designed specifically for graphics adapters, featuring dual-port access that allows the processor to write data while the display controller reads it simultaneously.

Option 2 is correct.

Optical disks, such as CDs and DVDs, store data along a single continuous spiral track that starts from the center and moves outward, unlike the concentric circular tracks used in hard and floppy disks.

The 3.5-inch floppy disk became the industry standard for personal computers in the late 1980s and 1990s, replacing the larger 5.25-inch format.

Rotational delay, or latency, is the time required for the desired data sector on a disk to rotate under the read/write head after the head has reached the correct track.

Dynamic RAM (DRAM) is used as the primary memory (main memory) in computers because it is volatile and provides fast access for the CPU to execute programs.

In floppy disks, the read/write head makes physical contact with the magnetic surface of the disk. In contrast, hard disk heads 'fly' on a cushion of air to prevent wear.

RAID is an acronym for Redundant Array of Independent Disks (originally Inexpensive Disks), a technology used to provide data redundancy and performance improvement.

A mini computer is a class of multi-user computers that lie in the middle range of the computing spectrum, between the smallest mainframe computers and the largest microcomputers. They are not portable like laptops or notebooks.

Modern computers are built using digital logic circuits that represent data as two states, on or off, which corresponds to the binary number system (0 and 1).

In a non-positional system, the value of a symbol does not depend on its position in the number. In Roman numerals, 'I' always represents 1 regardless of where it appears.

The fifth generation of computers is primarily defined by the development and implementation of artificial intelligence, allowing machines to process information and make decisions more like humans.