Memory Units — Set 1

Correct Answer: A. Bit

A bit is the most basic unit of information and can have a value of either 0 or 1. It represents the logical state of a digital circuit. The term bit is a contraction of 'binary digit'.

Correct Answer: D. 4 bits

The correct answer is '4 bits'. A nibble is exactly half of a standard byte, consisting of four binary digits. It is useful for representing a single hexadecimal digit. In early computing, nibbles were often used to store BCD encoded numbers.

Correct Answer: A. Byte

A byte is a unit of data that is eight bits long and is the standard unit for character encoding. It can represent 256 different values. Most hardware architectures treat a byte as the smallest addressable unit of memory.

Correct Answer: D. 1024 bytes

While kilo generally means 1000, in binary-based computing, it refers to two to the power of ten. This results in a value of 1024 bytes per kilobyte. This standard is commonly used in technical documentation and textbooks.

Correct Answer: A. 1 Megabyte

One Megabyte is equivalent to 1024 Kilobytes or approximately one million bytes. It was a common unit for measuring the capacity of floppy disks and early RAM. The abbreviation for Megabyte is MB.

Correct Answer: A. KB < MB < GB < TB

Memory units grow by a factor of 1024 at each step in the hierarchy. Kilobyte is the smallest in this list, followed by Megabyte and Gigabyte. Terabyte is the largest unit among the given options.

Correct Answer: D. 1024 Megabytes

A Gigabyte is composed of 1024 Megabytes according to the binary measurement system. It is roughly equivalent to one billion bytes of information. Modern hard drives and smartphones are typically measured in Gigabytes.

Correct Answer: A. Petabyte

A Petabyte is the unit that follows Terabyte in the standard memory hierarchy. It is used by large data centers and cloud service providers. One Petabyte is approximately 10 to the power of 15 bytes.

Correct Answer: D. The fixed number of bits processed by the CPU at once

The correct answer is 'The fixed number of bits processed by the CPU at once'. Word size depends on the CPU architecture, such as 32-bit or 64-bit systems. It indicates the amount of data the processor can handle in a single cycle. A larger word size generally improves the performance of the computer.

Correct Answer: A. Terabit

In technical notation, an uppercase 'B' stands for Byte while a lowercase 'b' stands for bit. Therefore, Tb refers to Terabit, which is often used to measure data transfer speeds. There are 8 bits in every 1 byte.