Quiz1

 1.Define input and differentiate among a program, command, and user response.

Ans.

Input is the term denoting either an entrance or changes which are inserted into a system and which activate/modify a process. It is an abstract concept, used in the modeling, system(s) design and system(s) exploitation. It is usually connected with other terms, e.g., input field, input variable, input parameter, input value, input signal, input port, input device and input file (file format).

Command is a directive to a computer program acting as an interpreter of some kind, in order to perform a specific task. Most commonly a command is a directive to some kind of command line interface, such as a shell.

Specifically, the term command is used in imperative computer languages. These languages are called this, because statements in these languages are usually written in a manner similar to the imperative mood used in many natural languages. If one views a statement in an imperative language as being like a sentence in a natural language, then a command is generally like a verb in such a language.

A computer program (also a software program, or just a program) is a sequence of instructions written to perform a specified task for a computer.A computer requires programs to function, typically executing the program's instructions in a central processor. The program has an executable form that the computer can use directly to execute the instructions. The same program in its human-readable source code form, from which executable programs are derived (e.g., compiled), enables a programmer to study and develop its algorithms.

2. Identify the keys and buttons commonly found on desktop computer keyboards, and described how keyboards for mobile computers and devices differ from desktop computer keyboards.

Ans.

A desktop computer is a personal computer (PC) in a form intended for regular use at a single location, as opposed to a mobile laptop or portable computer.
Desktop and tower computers are two different styles of computer case that use desk space in varying ways. Desktop computers are designed to lay flat on the desk, while towers stand upright.
Prior to the widespread use of microprocessors, a computer that could fit on a desk was considered remarkably small. "Desktop" indicates a horizontally-oriented computer case usually intended to have the display screen placed on top to save space on the desktop. Most modern desktop computers have separate screens and keyboards.

3. Describe the different mouse types and explain how to use a mouse.

Ans.

There are various computer mice types based on technology and working principle : ball mouse, optical (LED) mouse, laser mouse. Also they can be categorized based on DPI resolution. Also there are general purpose mouse types and special gaming mouse with lots of customizable buttons and high and variable resolution and faster sampling. Also they can be classified in terms of connectivity to the computer like wired (PS2, USB) and wireless (RF, IR, Bluetooth).

         

4. Describe various types of touch screen and explain how a touch-sensitive pad works.

Ans.

There are essentially two types of mobile touch screen computers. The first type is the convertible laptop which is popular among the typical computer users and the second type is the slate PC. The slate PC is geared toward a specified function making it particularly useful for professions that require what the device offers over the other type of touch screen computer. The slate PC is a much simpler tablet style PC while the convertible laptop can take the form of a standard laptop or a tablet. The versatility of a convertible laptop makes it useful for typical computing purposes with the addition of having touch recognition.

The slate PC is a single piece where the screen makes up most of one of the large surfaces. This is in contrast to the convertible laptop with looks and functions much more like a standard laptop that opens and shuts. The slate PC is essentially a tablet with no keyboard or mouse pad but the option to use those peripherals is made possible through the USB connection. Otherwise the all user interface and command inputs are communicated to the computer entirely through the touch screen.

The light weight and improved portability of the slate PC over the convertible laptop is made possible by eliminating the keyboard and touch pad. They usually offer larger screen sizes as well so that it is more effective for creating hand written notes. The larger screen minimizes the distance between the margins of the screen which slows down note taking. For people who need to carry the tablet around and take notes while on their feet this is the perfect device for that job function.

The convertible touch screen laptops offer their own advantages and it is quite obvious what they are. These devices can transform from a standard laptop into a tablet. This is made possible by the design of the hinge which holds the screen and the rest of the computer together on a swivel allowing it to rotate 180 degrees and fold back over the keyboard screen side up. This makes it more effective when writing or drawing on the screen like a traditional notepad.