Computer Studies Notes + Tips + Queries

[Saad Mughal]

i m hoping that spreadsheets, databases, logic gates, algorithm and program flowchart, all will come in P1!
they r the easiest and are completely based on common sense!

Well, they almost always do come. Spreadsheets and Algorithms come almost every year and Logic gates, Databases and Flowcharts almost every other year.

 

[Suchal Riaz]

what is polling?

for example a device wants to let operating system to know something. like it wants to send files, printer wants to tell that it is out of paper or sensor tells that fire has been detected. it can not send information by itself. operating systems check all the devices after regular intervals. for example after every seconds the operating system checks for all the devices if they have something to tell it. this checking is called polling and the systems using this are called polling system.
Nowadays interrupt is used instead. operating system does not waste time and power to check. whenever an application or printer needs attention, it interrupts the processor.

 

[Mohammad Farzanullah]

It's like checking for the devices and whether they require are ready to the processor's orders or not. It is the continuous checking of the status of a device, such as a printer, to check if it is ready to perform the task that is to be given to it by the computer. For example, when you're printer is adjusting ink cartridges and you give a print, the computer waits until the printer has performed the adjustments by continuously checking its status and then gives it the print order.

thanks

 

[Galaxy]

P3 case study would be an example of real time transaction processing right since it updates as soon as a booking is made?

 

[Saad Mughal]

P3 case study would be an example of real time transaction processing right since it updates as soon as a booking is made?

Yes. All booking systems are real time transaction processing, since the availability of the seat/tour has be immediately marked to booked or reserved to avoid double booking.

 

[guestp]

Guys, if we get a 3 marks question, and write, say, 6-7 points, will we get full marks for the question if the first or first two points are not relevant? Plz do reply.

 

[Saad Mughal]

Guys, if we get a 3 marks question, and write, say, 6-7 points, will we get full marks for the question if the first or first two points are not relevant? Plz do reply.

No. The first three points are checked.

 

[guestp]

Are you certain? Coz our teacher told us that the first point would be discarded then?

 

[Saad Mughal]

Are you certain? Coz our teacher told us that the first point would be discarded then?

Look, I read this in some examiner tips that it is ALWAYS a waste of time when candidates provide more than the amount of reasons required. If they say, 2 reasons, then write 2 reasons. However, if there is a 3 mark question for Description, Explanation or Reasoning then you should write 3-4 logical statements to earn the 3 marks. Just do what the question requires, no more, no less.

 

[guestp]

Paper 1 mein tou time hi time hota hai.
Well, thanks anyways.

 

[Saad Mughal]

Paper 1 mein tou time hi time hota hai.
Well, thanks anyways.

You're kidding, right? I find paper 1 to be so short with such a long time duration.

 

[guestp]

^My point exactly. I think u didnt read my comment properly.

Anyways, another quick question, for input using touch screen, do we use manual input (trapezium) or the normal one (parallelogram)?

 

[Saad Mughal]

Oh sorry. I read time hee nhi hota.
Manual input because humans are involved. It's not "automatic".

 

[guestp]

Flowcharts hate me.

If we are checking availability of cabins/seats, is it supposed to be a double-headed arrow, or a single-headed one (from the cabins file to the process box only)?

 

[Saad Mughal]

Flowcharts hate me.

If we are checking availability of cabins/seats, is it supposed to be a double-headed arrow, or a single-headed one (from the cabins file to the process box only)?

Single one.

 

[mohdumar]

Are you certain? Coz our teacher told us that the first point would be discarded then?

Just decide on your strongest points. and write them.

 

[starship]

Just decide on your strongest points. and write them.

Single one.

Any expected questions which haven't come before?

 

[Saad Mughal]

Any expected questions which haven't come before?

Like you said, I believe that Podcasts, Wiki's, Social Networking, their effects and their definitions could come.
I expect a Program Flowchart with the options provided and we would have to fill.
Plus, PERHAPS a double loop algorithm.
Other than that, all the ordinary.
ATC is always the same. No need to worry about it.

 

[usman ijaz]

In ATC....in system flowchart do we have to use decision making box.??

 

[Saad Mughal]

In ATC....in system flowchart do we have to use decision making box.??

No. It does not carry any marks.