Computer Notes of Chapter 3 for Class/grade 4.
Input Devices Chapter 3 Computer Notes Class 4. Check Notes of Computer Science of Chapter Three (3) – “Input Devices” of Class 4-iv.
1. Put a tick (✓) in the correct statements and cross (X) in the false ones.
a. The most commonly used input devices are mouse and monitor. (X)
b. You need to press the shift key to type special characters. (✓)
c. Ctrl and Alt keys are used to move the cursor in the document. (X)
d. To type all the letters in capital, you need to turn off the Alt key. (X)
e. Right clicking on an item usually displays a list of commands. (✓)
f. The touch screen replaces the use of mouse and light pen. (✓)
g. Touch pad is mostly used to input pictures into the computer. (X)
h. Microphone is used to input sounds into the computer. (✓)
i. Scanner is also called the direct entry input device. (✓)
2. Match the following devices with their uses.
3. Write down the function of the following special keys:
4. Answer the following questions:
a. What are input devices? List any four input devices.
Answer: The devices that are used to give data and instruction to the computer are called input devices.
The four input devices are:-
- Web camera
b. What is keyboard? Write different groups of keys.
Answer: Keyboard is the basic input device which is used to enter data and instructions into the computer.
The different groups of keys are:-
- Alphanumeric keys
- Control keys
- Navigation keys
- Numeric keypad.
c. What is mouse? How can you hold the mouse?
Answer: The mouse is a basic input device and it is also called the pointing device.
We can hold the mouse gently with our index finger resting on the left button and our thumb resting on the side.
d. What are the different mouse actions?
Answer: The different mouse actions are:-
- Clicking (Single-clicking)
- Double clicking
e. Write short notes on:
i. Touch pad:- Touch pad is a touch sensitive pad that is used as a pointing device. By putting our fingers on the touch pad, we can point the objects and give commands to the computer. It is mostly used in some portable computers such as Laptop computer, palm top computer, Notebook computer, etc.
ii. Touch screen:- Touch screen is a touch sensitive screen. We can use our fingers to select objects on the monitor screen and give commands to the computer. We can use our fingers instead of mouse. It replaces the use of mouse and light pen as a pointing device. Touch screens are mostly used on portable computers such as Laptop computer, Palm to computer, Notebook computer, etc.
iii. Scanner:- A scanner is an input device that copies images or printed text and puts them into the computer. We can directly input the data into the computer without typing it through the keyboard using scanner. The scanner is also called the direct entry or non-keyboard input device.
iv. Webcam:- A web camera is an input device that takes photos and puts them into the computer. It is also used to capture videos. It is generally connected to a computer using a USB port. It is widely used in internet chatting. It is used in messenger program such as Yahoo! Messenger, Windows Love Messenger and Skype.
v. Microphone:- A microphone is an input device that is used to input sound into the computer. Using microphone, you can record speech and songs in the computer. It is also used in internet voice chatting.
5. Write single word for the following:
a. The device which is used to input sound to the computer. Microphone
b. The longest key of the keyboard. Spacebar
c. An input device which is used to take photos and puts into the computer. Web camera
d. The process of processing left mouse button and moving it together. Dragging
6. Complete the following crossword: