Class 4 Chapter 6 System unit

 Class 4 Chapter 6 System unit

2. Answer the following questions:

a. What is a system unit?

Ans: System unit is the most important part of the computer. b. List the major devices contained in the System Unit.

Ans: The major devices contained in the system unit are: the motherboard, processor, power supply, main memory, etc. C. What is CPU? Write its different sections.

Ans: CPU is the main processing unit of a computer it is also called the brain of a computer. The different sections of CPU are: ALU (arithmetic logic unit) CU (control unit) MU (memory unit) d. What is a Port?

Ans: A port is an interface or a connecting point where a peripheral device is connected. e. What is the use of a DVD drive?

Ans: DVD drive is used for inserting DVD for watching the movie, Installing new programs. f. What is the function of the power supply box?

Ans: Power supply box converts the high current (220 volt) into low voltage (5 or 12 volt) g.Why is a USB port very useful?

Ans: A USB port is very useful for connecting peripheral devices like mobile, Pendrive, Mouse, Keyboard, etc. h. What is a motherboard? What does it contain?

Ans: Motherboard is the main circuit board of the computer. It contains a microprocessor, RAM, Video card, Expansion card, Slots, etc. i. What are expansion slots?

Ans: Expansion slots are the extra slots in the motherboard which are used to plug in extension cards that provide extra options. Eg. TV cards, Sound cards, etc.

i. What is the use of CMOS Battery?

Ans: CMOS Battery is used to hold the configuration of the system and it is also powers the internal clock of the computer. k. What does the variety of color lights indicate?

Ans: The variety of color lights indicates that the computer is busy in processing. I. What is the use of video cards?

Ans: Video cards are used to display graphics on the computer screen. m. What is the main memory? List its types.

Ans: The memory that is used to store program, instructions, and currently used data in the computer. RAM and ROM are the types of main memory. n. What is the use of the reset button?

Ans: Reset button is used to restart the computer without disconnecting the power supply. o. What is the function of BIOS?

Ans: The function of BIOS is to control the presence of hard disk, floppy disk, CDROM, memory, mouse, keyboard, monitor, printer, and other peripheral devices.