Answer:
An operating system (OS) is a software which is responsible for the management of computer hardware, software, and also provides common services for computer programs.
Operating System is pivotal in teaching and learning because:
1. It enables computer programs to run smoothly on various computer devices.
2. The Operating System gives teachers the opportunity to install learning apps on their devices for ease of teaching.
3. It enables students to download and install learning applications, download and upload assignments, etc.
4. The Operating System makes video conferencing for online tuition easy and smooth.
5. It makes computer users to interact with other applications and softwares within a device.
Operating systems are found on many computer devices e.g: mobile phones, video games, PCs, supercomputers, etc.
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Answer:
Plastic extrusion is the process through which plastic is heated and forced through a heated chamber by a screw.
Molding is the process of forcing plastic through a die to form the final shape of a product.
Cooling: The plastic extruded is chilled.
Spool or cut: The continuous form is either spooled or cut into lengths.
Mold construction: Small plastic pellets are melted and moulded into a hollow tube known as a parison or preform (depending on the blow molding subtype).
Molding: The parison is clamped into a mold and inflated with pressured air until it adopts the shape of the mold's interior.
Cooling and ejection: The item cools in the mold until it is firm enough to be expelled.
Answer: In operating system a code segment which accesses some shared variables or resources one at a time atomically such other no other code or process is accessing that resource or variable at the same time.
Entry section code block allows the access to the shared resource or variable and exit section code signals the termination from access to the shared resource or variable.
Explanation:
Entry and exit section codes needs to check certain properties before allowing the access and removal of access to a particular code segment.
These conditions are:
1. Bounded waiting.
2. Mutual exclusion.
3. checking thread execution status to allows other threads to enter the critical section (CS).
Answer:
The user's account is blocked due to several unsuccessful login attempts.
Explanation:
Any device having a password security has a property of blocking the account or device in use after noticing several unsuccessful attempts of login.
So as a precautionary measure when the software notices such activity it blocks the access to that account so that any intruder might not be able to enter the account premises.
Same is the case with the employee who was trying to access his own account but due the expired password he made several attempts but couldn't log in. The software took it as an intruder and blocked the account.
The employee after requesting for password reset again tried to login but the account was blocked so he could not be able to access it again.
I think a presentation would be the answer.
Hopefully this helps, have a good day.
