4th Class Computers Science Computer and Its Peripherals Keyboard

     Keyboard  

The keyboard is the most common input device which is used to type the letters, digits and commands. It is an essential or standard input device. A keyboard is a typewriter like device which contains a matrix of switches (one switch per key). It typically has characters engraved or printed on the keys and each press of a key typically corresponds to a single written symbol. When a key is pressed, it sends a digital code to the computer which determines which key has been pressed. For example, if you press 'A' when Caps lock is on, a code 01000001 is sent to the computer. The computer then translates this code to determine that you pressed 'A'. However, to produce some symbols requires pressing and holding several keys simultaneously or in sequence. While most keyboard keys produce letters, numbers or signs (characters), pressing other keys or simultaneous key can produce actions or computer commands. Normally, the keyboard is used to type text and numbers into a word processor, text editor or other programs. Keyboards are also used for computer gaming, either with regular keyboards or by using keyboards with special gaming features, which can speed up frequently used    keystroke combinations. A keyboard is also used to give commands to the operating system of a computer, such as Control-Alt-Delete combination in Windows, which brings up a task window or shuts down the machine.    

 Given below is the information about keyboard. Read and identify the correct one.

1. Each key on the keyboard has characters engraved or printed on it.

2. When a key is pressed, it does not send any digital code to the computer.

3. After switching off the caps lock, if you press 'A', a code 01000001 is sent to the computer.

(A) 1 and 3                                                         

(B) Only 1

(C) 2 and 3                                                          

(D) All of these

(D) None of these  

Answer (B)

Explanation

Correct Option:

(B) Only statement 1 is correct about keyboard.

Incorrect Options:

(A) Statement 1 is correct but statement 3 is incorrect. Therefore, option (A) is incorrect.

(C) Statements 2 and 3 are incorrect. Therefore, option (C) is incorrect.

(D) All the given statements are not correct. Therefore, option (D) is incorrect.

(E) All the given statements are not incorrect. Therefore, option (E) is incorrect.  

  Fill in the blanks:

1. A keyboard is also used to give commands to the ________ system of a computer.

2. To shut down a computer ________ key combination is used.

3. A keyboard is a ________ like device which contains a matrix of ________

(A) Operating, Shift + Alt + Delete, Button, Switches

(B) Control, Tab + Ctrl + Backspace, Typewriter, Plug

(C) Operating, Ctrl + Alt + Delete, Typewriter, Switches

(D) Hard disk, Ctrl + Home + Delete, Calculator, Switches

(E) CPU, Ctrl + Shift + Delete, Typewriter, Switches  

Answer: (C)

Explanation

Correct Option:

(C) Options given in (C) are correct.

Incorrect Options:

(A) Options given in (A) are incorrect. Therefore, option (A) is incorrect.

(B) Options given in (B) are incorrect. Therefore, option (B) is incorrect.

(D) Options given in (D) are incorrect. Therefore, option (D) is incorrect.

(E) Options given in (E) are incorrect. Therefore, option (E) is incorrect.