Physics, Chemistry and Biology: Post your doubts here!

[cookiemaker]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w06_qp_1.pdf question 16 dont understand it !!

100 C = 22 cm
0 C = 2 cm

so the range is 20 cm (20-2)

100 C/20 cm = 5 C for each cm

In the picture the thermometer is at 8 cm. But remember 2 cm is 0 degrees, so 8-2 = 6 cm

and finally 6 x 5 = 30 degrees C

So the answer is C

Hope you understood.

 

[mohamed magdi]

100 C = 22 cm
0 C = 2 cm

so the range is 20 cm (20-2)

100 C/20 cm = 5 C for each cm

In the picture the thermometer is at 8 cm. But remember 2 cm is 0 degrees, so 8-2 = 6 cm

and finally 6 x 5 = 30 degrees C

So the answer is C

Hope you understood.

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w10_qp_13.pdf
Q35.....
how can the answer be C without A being correct? dont they explain each other..

 

[nothing]

can anybody give me an advice for studying physics I didn't study anything

 

[cookiemaker]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w10_qp_13.pdf
Q35.....
how can the answer be C without A being correct? dont they explain each other..

The current cannot flow because of the plastic support. The shock doesn't relate to the current.

 

[fatima hussein]

100 C = 22 cm
0 C = 2 cm
so the range is 20 cm (20-2)
100 C/20 cm = 5 C for each cm
In the picture the thermometer is at 8 cm. But remember 2 cm is 0 degrees, so 8-2 = 6 cm
and finally 6 x 5 = 30 degrees C
So the answer is C
Hope you understood.

THANKS SO MUCH!! I UNDERSTOOD

 

[Othman]

I didnot understand Q5

You have the weigh of 2 Kgs, you need to find the weigh of ten. Simple math 5*2 =10 so you need to multiply 18*5 also.

 

[Fatum Zuh]

I need instant help please
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w08_qp_1.pdf
QUESTION 35
Answer is A, but how? Could you please explain to me? I've got the exam 2morrow so I need the help ASAP.
Thank You.

 

[Othman]

I need instant help please
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w08_qp_1.pdf
QUESTION 35
Answer is A, but how? Could you please explain to me? I've got the exam 2morrow so I need the help ASAP.
Thank You.

They changed the magnetic poles so us the Flemings left hand rule, or simply put the opposite.

 

[ManalMansoor]

in Q3 u will hv to fnd de speed at all 4 stages...dere will b 2 wid de same speed...hope u gt it..
in Q29..we knw dat PD is directly propotional to resistance nd dat resistance is inversly prpotional to current....dere fre choose de with low pd but de 1 wid more current...r u cn easily fnd it by calculation using de formula...hope u gt it

Thanks a lott

 

[Fatum Zuh]

Another question
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w06_qp_1.pdf
Question 16
How to do it?

 

[ManalMansoor]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s05_qp_1.pdf
Please explain the answer to question 7.

Thanks x

 

[Jelleh Belleh]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s09_qp_1.pdf

Can someone please explain Q38?

 

[Iridescent]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s09_qp_1.pdf

Can someone please explain Q38?

An alpha particle consists of two neutrons and two protons. After emitting an alpha particle the no. of neutrons decreases by 2 i.e., 138-2 = 136. So, the answer is B.

 

[ManalMansoor]

Another question

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w06_qp_1.pdf
Question 16
How to do it?

You have to read the question carefully, it says 'When placed in steam, the mercury level rises to 22cm' therefore, 22cm is 100 degree. And when placed in melting ice it falls to 2cm. So 2cm is 0 degree.
Each point starting from 4cm is denoted as 10 degree.
So 2 = 0 degree
4 = 10 degree
6 = 20 degree
and 8 = 30 degree. (.. till 22 cm = 100 degree)
So the answer is 'C' (30 degree).
Hope you got me Good luck xx

 

[Jelleh Belleh]

An alpha particle consists of two neutrons and two protons. After emitting an alpha particle the no. of neutrons decreases by 2 i.e., 138-2 = 136. So, the answer is B.

Thanks, but that's Q39, i'm asking about Q38. ^-^;

 

[Jelleh Belleh]

Btw for Q39, I thought it was B too, but the marking scheme says it's C.

 

[Iridescent]

Thanks, but that's Q39, i'm asking about Q38. ^-^;

That is question 38.

 

[Iridescent]

Btw for Q39, I thought it was B too, but the marking scheme says it's C.

For question 39 the answer is C, You have to check how much time is taken for the sample to decay from 2000 counts/min to 1000 counts/min. That is 2 days.

 

[Jelleh Belleh]

Oh yeah, that's the answer I got. I was just confused because I was looking at different variants, by bad.

Thanks a lot for answering though, I really appreciate it.

 

[Iridescent]

Oh yeah, that's the answer I got. I was just confused because I was looking at different variants, by bad.

Thanks a lot for answering though, I really appreciate it.

You're welcome.