Explanation:
Computer is an electronic device that is designed to work with information.
WORKING PRINCIPLE OF COMPUTER
a.It accepts data and instructions by way of input,
b.It stores data,
c.It can process data as required by the user,
d.It gives result in the form of output,
e.It controls all operations inside a computer.
I hope it will help you
 
        
             
        
        
        
It really is hard to say because there are many slots and we do not know what your teacher is teaching. I have seen a lot of teachers teaching out of date material. With that said, here is a list from best to worst.
PCI Express x16
PCI Express x1
AGP
PCI
This is list is based on greatest to least and base on the bandwidth read and write speed.
        
             
        
        
        
Answer:
Some of the qualities of the installed memory which HWiNFO can reveal are:
- Date of manufacture
 - Memory type 
 - Speed of memory
 
Explanation:
HWiNFO is an open-source systems information app/tool which Windows users can utilize as they best wish. It helps to detect information about the make-up of computers especially hardware. 
If you used HWiNFO to diagnose the memory, the following information will be called up:
- the total size of the memory and its current performance settings
 - the size of each module, its manufacturer, and model 
 - Date of manufacture
 - Memory type 
 - Speed of memory
 - supported burst lengths and module timings, 
 - write recovery time etc.
 
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Here are the main functions of an operating system:
1) Manage the resources of the device
The operating system controls how much of each resource is distributed, and it controls things like the processing unit and memory.
2) Establish a interface for the user of the device
The operating system must classify what the classes of the script/code have to do and what they implement.
3) Service application software
The operating system must service each application that is downloaded onto the device. It must balance it's use of storage between apps.