Biology; Chemistry; Physics: Post your doubts here!

[Saad Mughal]

Don't know about biology students but a commerce student in my class gets furious over the fact that computer is so easy and is annoyed by the fact that we get good grades in it!

 

[usama321]

Don't know about biology students but a commerce student in my class gets furious over the fact that computer is so easy and is annoyed by the fact that we get good grades in it!

Wow, and i thought humanities subjects were the easiest

 

[Saad Mughal]

Computer is logical and comprises of common sense and general knowledge. I find it very easy!

 

[usama321]

Computer is logical and comprises of common sense and general knowledge. I find it very easy!

yup its easy. Just like geography. But sometimes there are questions that kinda baffle me.....hmmmmmmmmm, btw aren't we going a bit off the thread topic? :O

 

[Saad Mughal]

I loved attempting geography and I love attempting Computer.
Yes, some questions are harder and more analytical.
We are going off topic, this thread is for sciences.

 

[usama321]

I loved attempting geography and I love attempting Computer.
Yes, some questions are harder and more analytical.
We are going off topic, this thread is for sciences.

yup i can say that i really love computers. But the subject gets a bit boring. I am more into the pseudocode, high level language stuff, and right now its missing. Heard the new computer syllabus is gonna focus more on that

 

[Saad Mughal]

Who cares now? The next batches are going to be lucky in that aspect but only 2 weeks left for us.

 

[nidz]

The initials from Fundamental Chemistry, the extra details from the internet; I read it a couple of months ago along with Hydrogen's potential of being a renewable energy source.

Oh.. well thanks

 

[Saad Mughal]

 

[Amnaa]

These are the exact words from this website http://ask.cie.org.uk/system/selfse...&USERTYPE=1&CMD=VIEW_ARTICLE&ARTICLE_ID=33226
The process of grading in Cambridge O Level involves deciding the minimum mark necessary for each grade. We do not have predetermined thresholds (or quotas of candidates). After each examination series we decide the minimum marks for each threshold (grade boundaries) for each individual component. We carry out this process in order to ensure that the demands on the candidates are the same for every subject and every examination series. We are therefore unable to provide a general list of percentages required for each grade.

 

[Amnaa]

yeh kya baat hui :/ ?

 

[Usama Jawad]

yeh kya baat hui :/ ?

there is a percentile system ie grades depend on how difficult the paper was like if very few people get 90%+ then CIE keeps A* on lower % like 80%.
This is why the CIE website cannot tell the grading and % of grades because it depends on how candidates attempted the paper
hope you understand now

 

[robinhoodmustafa]

can anyone tell me the role of the mosquito as a vector of disease???

They are a called the Host so the Female Mosquito lands on a human and sucks her blood and in that period she releases numerous amount of eggs in our blood stream. the person would have Malaria if the person is injected by the Mosquito who just took blood from a infected one.

If a person has sickle cell anemia than he wont be affected by malaria.he just cannot have this disease.It will not effect him at all. (That is an advantage of mutation)

 

[asma tareen]

They are a called the Host so the Female Mosquito lands on a human and sucks her blood and in that period she releases numerous amount of eggs in our blood stream. the person would have Malaria if the person is injected by the Mosquito who just took blood from a infected one.

If a person has sickle cell anemia than he wont be affected by malaria.he just cannot have this disease.It will not effect him at all. (That is an advantage of mutation)

thnx

 

[papajohn]

Which direction will the coil rotate???

 

[Saad Mughal]

Downwards at point P and Upwards at point Q. Hence, anticlockwise.

 

[usama321]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w05_qp_2.pdf

can anyone please answer question 5 b

 

[ijlalm]

http://books.google.com.pk/books?id=W1nHB3WcyOEC&pg=PA48&source=gbs_selected_pages&cad=3#v=onepage&q&f=false
can anyone answer the MCQ 50 of the topic "Energy, Work and Power"???...Even a tukka would count!!

 

[ijlalm]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w05_qp_2.pdf

can anyone please answer question 5 b

(i) Electrical Energy from the main supply converts into chemical energy which eventually gets stored in the battery.
(ii) Electrical energy is converted to kinetic energy so sound energy is produced.

 

[Saad Mughal]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w05_qp_2.pdf

can anyone please answer question 5 b

Since they are asking for USEFUL energy outputs, the answer would simply be:
Electrical Energy from the mains changes into Chemical Potential Energy stored in the battery, as follows:
Electrical Energy ----> Chemical Energy.