Biology; Chemistry; Physics: Post your doubts here!

[luckywang]

wat is astable,bistable? :O

the circuit... included in syllabus..

 

[a.abid]

the circuit... included in syllabus..

Oh acha woh waala...u almost scared me to death The heat-operated and sound-operated circuits right?

 

[A star]

Go through the book and notes thoroughly and try to learn definitions and practice pastpapers.

just do so many past papers that u remember any single damn question they can ask. I do and know atleast 2-3 questions by heart.

 

[a.abid]

just do so many past papers that u remember any single damn question they can ask. I do and know atleast 2-3 questions by heart.

But wats the point of learning them by heart?We dont get same questions So I prefer thorough studying...that helps alot

 

[luckywang]

Oh acha woh waala...u almost scared me to death The heat-operated and sound-operated circuits right?

in syllabus section 25 that one... see content 25.2 Bistable and astable circuits...

 

[A star]

wat is astable,bistable? :O

i know logic gate but what the heck is astable and bystable

 

[luckywang]

what this mean?
(thermistor assumed to be of the negative temperature coefficient type)

 

[A star]

But wats the point of learning them by heart?We dont get same questions So I prefer thorough studying...that helps alot

no u donot get my point just do each question once or twice you will automatically remember them when u see it.

 

[A star]

its resistance decreases with temp increase. i think

 

[luckywang]

i know logic gate but what the heck is astable and bystable

no people know.. then why should i study it?

 

[a.abid]

no u donot get my point just do each question once or twice you will automatically remember them when u see it.

Yeah okay.

 

[a.abid]

no people know.. then why should i study it?

In this way ur cutting off ur options for getting an A*.If u do them u'll have a greater chance for getting gud grades

 

[luckywang]

how a reed switch operate as light-sensitive switch and temperature operated alarm?

 

[luckywang]

In this way ur cutting off ur options for getting an A*.If u do them u'll have a greater chance for getting gud grades

then how? yes or not?

 

[a.abid]

then how? yes or not?

U shud do them if u have the notes

 

[a.abid]

how a reed switch operate as light-sensitive switch and temperature operated alarm?

wat?

 

[luckywang]

wat?

what what again? this is not at the compulsory section!

 

[a.abid]

what what again? this is not at the compulsory section!

I am asking kay wat dont u understand about it?As in wat is ur question?Maybe I can help

 

[bogus]

http://www.xtremepapers.com/papers/...nal O Level/Physics (5054)/5054_s11_qp_12.pdf
confused between b and c of question 35 plz clarify

 

[a.abid]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Physics (5054)/5054_s11_qp_12.pdf
confused between b and c of question 35 plz clarify

The answer is C this is because soft iron core demagnetizes and magnetises easily,This helps to increase the strength of magnetic field of the coil.