Physics: Post your doubts here!

[♣♠ Magnanimous ♣♠]

Bit of busy, will solve it in 15 mins.

thanks.

 

[Browny]

I had solved it already, and I want you to explain it, cause I am tired of solving doubts frm yesterday night, you now can take my place I am off.

Can anyone please state the number of significant figures wee should leave a answer to in the physics theory paper?

Would the CIE examiners cut marks for wrong number of significant figures in the final answers?

 

[Browny]

thanks.

Can anyone please state the number of significant figures wee should leave a answer to in the physics theory paper?

Would the CIE examiners cut marks for wrong number of significant figures in the final answers?

 

[Zepudee]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s13_qp_23.pdf

Q1(b)(iii) anyone, please?

 

[♣♠ Magnanimous ♣♠]

Can anyone please state the number of significant figures wee should leave a answer to in the physics theory paper?

Would the CIE examiners cut marks for wrong number of significant figures in the final answers?

well I would prefer 3 sig figures and i have observed that sometime it is rejected or many times i have experienced wrong answers too. so use 3 to 4 sig figures.

 

[Browny]

But in some mark schemes some answers are to 2 s.f

 

[Browny]

Would they not cut marks for s.f

 

[MiniSacBall]

But in some mark schemes some answers are to 2 s.f

Would they not cut marks for s.f

Post in only 1 post, why are you posting 2 times.
As i said they won't cut marks unless, it is stated in the question, Most of the time it is in 3 significant figures, so don't worry.
The 2 significant one are like this:
eg: if your answer is like 21.998766737230192
Then 3 significant figures is 22.0. So i guess you are confused in this.
Just write it as 3 significant figures, but if questions says something else, go according to it.

 

[Browny]

Post in only 1 post, why are you posting 2 times.
As i said they won't cut marks unless, it is stated in the question, Most of the time it is in 3 significant figures, so don't worry.
The 2 significant one are like this:
eg: if your answer is like 21.998766737230192
Then 3 significant figures is 22.0. So i guess you are confused in this.
Just write it as 3 significant figures, but if questions says something else, go according to it.

Shall I give you some questions which are clearly given to 2.s.f?

 

[_Ahmad]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_22.pdf

Q2 b
Can anyone please explain the sketch

 

[Browny]

Post in only 1 post, why are you posting 2 times.
As i said they won't cut marks unless, it is stated in the question, Most of the time it is in 3 significant figures, so don't worry.
The 2 significant one are like this:
eg: if your answer is like 21.998766737230192
Then 3 significant figures is 22.0. So i guess you are confused in this.
Just write it as 3 significant figures, but if questions says something else, go according to it.

There is a question where the answer is 4.5333333333.....*10^-3, how many s.f. should we leave that to?

 

[MiniSacBall]

There is a question where the answer is 4.5333333333.....*10^-3, how many s.f. should we leave that to?

Shall I give you some questions which are clearly given to 2.s.f?

Dude just don't worry about significant figures, they won't cut the marks, only if the questions says, that your answer should be in _ significant numbers, then only you have to worry about significant figures.
The answer could be both 4.5*10^-3 or 4.53*10^-3
Both are same

 

[Browny]

How can both be same 1 ans is to 2 s.f. other is to 3.s.f. and the marking scheme gives to 2 s.f.

And why won't they cut marks for s.f., the grading threshold is so low because they do cut for s.f..

 

[Thought blocker]

Thought blocker
we have done this so explain dude!

Q3b) I am not sure, better Suchal Riaz help you
Q5b)
i)
2 = I ( 4 + 0.5 + 2.5 )
I = 0.29A
ii)
R across * J = (0.9/1) * 4 = 3.6 omega
V = IR = 0.29 * 3.6 = 1.03V
iii)
Same as ii) i.e is 1.03 as r do not need any value , We are asked reason too in next question
iv)
P.d. across r is 0 hence r in not needed to be consider

 

[♣♠ Magnanimous ♣♠]

Q3b) I am not sure, better Suchal Riaz help you
Q5b)
i)
2 = I ( 4 + 0.5 + 2.5 )
I = 0.29A
ii)
R across * J = (0.9/1) * 4 = 3.6 omega
V = IR = 0.29 * 3.6 = 1.03V
iii)
Same as ii) i.e is 1.03 as r do not need any value , We are asked reason too in next question
iv)
P.d. across r is 0 hence r in not needed to be consider

great!! I was unsure of what you said
but i was too knowing 5b)

 

[Thought blocker]

great!! I was unsure of what you said
but i was too knowing 5b)

ok...

 

[Browny]

Thought blocker can you help me out in the s.f problem?

 

[Thought blocker]

Thought blocker can you help me out in the s.f problem?

Yeah, I generally keep my answer in 3 s.f, whether they ask ask for s.f or not
And in many of the m.s answers are in 3s.f

 

[Browny]

Yeah, I generally keep my answer in 3 s.f, whether they ask ask for s.f or not
And in many of the m.s answers are in 3s.f

Will the examiners cut marks for our answers s.f. not being the same as m.s s.f.?

And it was 50 50 for me some questions in papers are to 2 others are to 3 sometimes within the same question different parts!!!

 

[Thought blocker]

Will the examiners cut marks for our answers s.f. not being the same as m.s s.f.?

And it was 50 50 for me some questions in papers are to 2 others are to 3 sometimes within the same question different parts!!!

In this case,
Gimme that paper's link I'll tell you what do