Interview Questions and Answers

Binary numbers look strange when they are written out directly.This is because the digits weight increases by powers of 2, rather than by powers of 10. In a digital numeral, the digit furthest to the right is the ones digit; the next digit to the left is the twos digit; next comes the fours digit, then the eights digit, then the 16s digit, then the 32s digit, and so on.The decimal equivalent of a binary number can be found by summing all the digits.For example, the binary 10101 is equivalent to the decimal = 1x2⁰ + 0x2¹ + 1x2² + 0x2³ + 1x2⁴ = 1 + 4 + 16 = 21:

The numbers from decimal 0 through 15 in decimal, binary, octal and hexadecimal form are listed below. 

Swiftly pressing and releasing a mouse button.

A mouse click is the action of pressing (i.e. clicking, an onomatopoeia) a button to trigger an action, usually in the context of a graphical user interface (GUI). Clicking an onscreen button is accomplished by pressing on the real mouse button while the pointer is placed over the onscreen button icon.

Kilobyte: A Kilobyte is approximately 1,000 Bytes, actually 1,024 Bytes depending on which definition is used. 1 Kilobyte would be equal to this paragraph you are reading, whereas 100 Kilobytes would equal an entire page.

Megabyte: A Megabyte is approximately 1,000 Kilobytes. In the early days of computing, a Megabyte was considered to be a large amount of data. These days with a 500 Gigabyte hard drive on a computer being common, a Megabyte doesn't seem like much anymore. One of those old 3-1/2 inch floppy disks can hold 1.44 Megabytes or the equivalent of a small book. 100 Megabytes might hold a couple volumes of Encyclopedias. 600 Megabytes is about the amount of data that will fit on a CD-ROM disk.

Gigabyte: A Gigabyte is approximately 1,000 Megabytes. A Gigabyte is still a very common term used these days when referring to disk space or drive storage. 1 Gigabyte of data is almost twice the amount of data that a CD-ROM can hold. But it's about one thousand times the capacity of a 3-1/2 floppy disk. 1 Gigabyte could hold the contents of about 10 yards of books on a shelf. 100 Gigabytes could hold the entire library floor of academic journals.

Terabyte: A Terabyte is approximately one trillion bytes, or 1,000 Gigabytes. There was a time that I never thought I would see a 1 Terabyte hard drive, now one and two terabyte drives are the normal specs for many new computers.  To put it in some perspective, a Terabyte could hold about 3.6 million 300 Kilobyte images or maybe about 300 hours of good quality video. A Terabyte could hold 1,000 copies of the Encyclopedia Britannica. Ten Terabytes could hold the printed collection of the Library of Congress. That's a lot of data.

Petabyte: A Petabyte is approximately 1,000 Terabytes or one million Gigabytes. It's hard to visualize what a Petabyte could hold. 1 Petabyte could hold approximately 20 million 4-door filing cabinets full of text. It could hold 500 billion pages of standard printed text. It would take about 500 million floppy disks to store the same amount of data.

Exabyte: An Exabyte is approximately 1,000 Petabytes. Another way to look at it is that an Exabyte is approximately one quintillion bytes or one billion Gigabytes. There is not much to compare an Exabyte to. It has been said that 5 Exabytes would be equal to all of the words ever spoken by mankind.

Zettabyte: A Zettabyte is approximately 1,000 Exabytes. There is nothing to compare a Zettabyte to but to say that it would take a whole lot of ones and zeroes to fill it up.

Yottabyte: A Yottabyte is approximately 1,000 Zettabytes. It would take approximately 11 trillion years to download a Yottabyte file from the Internet using high-power broadband. You can compare it to the World Wide Web as the entire Internet almost takes up about a Yottabyte.

Brontobyte: A Brontobyte is (you guessed it) approximately 1,000 Yottabytes. The only thing there is to say about a Brontobyte is that it is a 1 followed by 27 zeroes!

Geopbyte: A Geopbyte is about 1000 Brontobytes! Not sure why this term was created. I'm doubting that anyone alive today will ever see a Geopbyte hard drive. One way of looking at a geopbyte is 15267 6504600 2283229 4012496 7031205 376 bytes!

BIOS, which stands for Basic Input/Output System, is a built-in software that initializes hardware during the booting process of a computer and provides basic functionality for the operating system. It is typically stored on a ROM (Read-Only Memory) chip on the computer's motherboard. BIOS performs essential tasks such as conducting power-on self-tests (POST), detecting and initializing hardware components like the CPU, memory, and storage devices, and providing a basic interface for configuring system settings. BIOS also facilitates communication between the operating system and the hardware. While modern computers increasingly use UEFI (Unified Extensible Firmware Interface) instead of traditional BIOS, the fundamental purpose remains the same: to initialize hardware and provide a bridge between hardware and software during the boot process.