Computer Basics and General Science

The statement is false because tigers are natural predators that hunt wild prey; only a very small minority of tigers become man-eaters, usually due to injury, old age, or habitat loss.

US temperatures have increased by approximately 1.2°F (0.7°C) over the last century, which is less than 1°C. This is consistent with global warming patterns observed worldwide.

The blue whale is a mammal, not a reptile. It gives birth to live young, nurses them with milk, and is warm-blooded - all characteristics of mammals.

Toads are amphibians, which are cold-blooded vertebrates that typically start life in water (as tadpoles) and then live on land as adults. They have moist skin and undergo metamorphosis.

CO2 constitutes approximately 0.04% (400 ppm) of Earth's atmosphere, which is far less than 1%. Despite this small concentration, it is a critical greenhouse gas that has increased significantly due to human activities.

Elephants are renowned for their excellent memory, which helps them remember water sources, migration routes, and recognize other elephants even after long separations. This is a key survival trait.

Rhino horns are made of keratin, the same protein found in human hair and fingernails. They are not true horns (which have a bony core) but rather a mass of hardened hair-like filaments.

Hardware refers to the physical, tangible parts of a computer system, such as the monitor, keyboard, and internal circuitry. Software is intangible code, and 'peripheral' refers to external hardware devices.

Input devices are hardware components that allow users to enter data and instructions into the computer. Examples include keyboards, mice, microphones, and webcams. Output devices (like monitors and printers) display or produce results, while software is the program code itself.

This is a standard textbook definition of a computer. A computer is an electronic device that accepts input (data), processes it according to stored instructions (software/programs), produces output, and stores results. Input is just the data entry process, software is the code itself, and hardware is the physical components - none of these fully capture the complete definition.

Software consists of the programs, data, and instructions that tell a computer how to perform specific tasks. Hardware refers to the physical components, while the CPU is a specific piece of hardware that executes those instructions.

The CPU (Central Processing Unit) is installed on the motherboard inside the computer tower and is responsible for executing instructions and coordinating all computer operations - earning it the metaphor 'heart of the computer'. Peripherals are external devices, programs/software are instructions, not hardware components.

Peripherals are external hardware devices attached to and communicating with the computer tower, such as keyboards, mice, monitors, printers, and external drives. The CPU is inside the tower (internal component), software is programs (code), and storage (like hard drives) can be internal or external - but peripherals specifically refers to attached external devices.

Output devices, such as monitors, printers, and speakers, are hardware components that allow the computer to convey information or results to the user. Input devices, conversely, allow the user to provide data to the computer.

Storage devices like hard drives, SSDs, and USB drives retain information even when power is off. Input devices send data to the computer, output devices display results, and software is the code that runs on hardware.

In Excel, the keyboard shortcut Alt+A+V+V opens the Data Validation dialog box from the Data tab. This allows you to set rules for what data can be entered in a selected cell or range.

Alt+F7 is not the shortcut for macros in Excel - it's typically used for spelling/grammar checking in Microsoft Word. The correct shortcut for macros in Excel is Alt+F8, which opens the Macros dialog.