Biology; Chemistry; Physics: Post your doubts here!

[Mahnoorfatima]

It's easy. What do you find hard about it?
Taking readings?

Yep. :'( The readings..

 

[Mahnoorfatima]

It probably wont.

INSHA ALLAH! INSHA ALLAH!

 

[ciesgetoveralready]

Can anybody tell me about the experiment to show electrostatic charging by friciton? Is it the one where we rub sfur with ebonite rod or glass rod with silk?

 

[Fate0]

Can anybody tell me about the experiment to show electrostatic charging by friciton? Is it the one where we rub sfur with ebonite rod or glass rod with silk?

Yup. We charge the rods by friction.
We bring it closer to an electroscope. There will be a deflection/divergion in the electroscope if it's charged.

 

[ciesgetoveralready]

Yup. We charge the rods by friction.
We bring it closer to an electroscope. There will be a deflection/divergion in the electroscope if it's charged.

Thanks. I have sent you in inbox. Will you please check it and reply?

 

[Dark Destination]

Yup. We charge the rods by friction.
We bring it closer to an electroscope. There will be a deflection/divergion in the electroscope if it's charged.

But Electroscope is not a part of our syllabus. .-. Right?

 

[ciesgetoveralready]

But Electroscope is not a part of our syllabus. .-. Right?

Ummm its in the book and we were taught this topic. Although it does say optional.

 

[princess Anu]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s13_qp_42.pdf
Q2 a
how do we know the gradient as to draw the line after 5 mins?

 

[***amd***]

whats the difference between chemical and nuclear energy?

 

[Fate0]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s13_qp_42.pdf
Q2 a
how do we know the steepness of gradient as to draw the line after 5 mins?

We know that one big box represents 500m . We also know the time.

 

[peacce]

what are the advantages and disadvantages of connecting cells in parallel and series.

 

[Fate0]

whats the difference between chemical and nuclear energy?

Chemical energy is stored energy in any part of body.
Nuclear energy is the energy stored in nucleus of an atom.

 

[ciesgetoveralready]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s13_qp_42.pdf
Q2 a
how do we know the gradient as to draw the line after 5 mins?

When youll label 1000 on the y-axis and 15 on x-axis and draw the line youll automatically understand it. No need for the gradiesnt here

 

[Maganius]

whats the difference between chemical and nuclear energy?

Chemical energy refers to forces between atoms; nuclear energy refers to forces within the nucleus of individual atoms.

 

[Fate0]

what are the advantages and disadvantages of connecting cells in parallel and series.

They only ask about the Advantages in Parallel:
I) Less internal resistance so they don't heat up and more brighter
II) Last longer
III) If one blows, other keep working.

 

[princess Anu]

When youll label 1000 on the y-axis and 15 on x-axis and draw the line youll automatically understand it. No need for the gradiesnt here

in the same paper Q4 why won't the connections of voltmeter be parallel to the cell as the student has to measure its voltage :/ but Marking scheme says in series. why

 

[princess Anu]

They only ask about the Advantages in Parallel:
I) Less internal resistance so they don't heat up and more brighter
II) Last longer
III) If one blows, other keep working.

do they last longer? isnt it cells run out fast?

 

[ciesgetoveralready]

in the same paper Q4 why won't the connections of voltmeter be parallel to the cell as the student has to measure its voltage :/ but Marking scheme says in series. why

becuase there is only voltmeter present. for example had there been a lamp or a fan or any other object then we'll have to make it parallel to the voltmetetr but since here only voltmeter is there in the circuit we will draw it in series

 

[Fate0]

in the same paper Q4 why won't the connections of voltmeter be parallel to the cell as the student has to measure its voltage :/ but Marking scheme says in series. why

Voltemeter is connected in parallel as we have to measure the potential difference between two points in a circuit. In this circuit, the potential difference will be same all over.

 

[***amd***]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s13_qp_42.pdf
Q2 a
how do we know the gradient as to draw the line after 5 mins?