Physics paper1: the discussion.

[Ahmedattia24]

Ask your questions here.

What is the answer for the question concerning the cut live wire which is protruding from the wall? Is it fire or electric shock.

What is the answer for the question concerning the wax thing, is it C?

 

[abdelm]

I chose electric shock and that the wax is all solid, I am not very sure about my answer to the wax one.

 

[SoOona]

ughh the exam was confusing i chose fire .. the wax i chose the arrow that pointed downwards cant remember which letter.
for the vaccum flask wht was the answer radiation convection conduction or all 3 or wht???
and 4 the magnet question when u reversed the battery i chose A both magnetised
hmm wht else for glass block wht was the answer ??

 

[SoOona]

owhh and the question for the battery and the box of matches ... wht was the answer??

 

[SoOona]

owhh and the thermometer 1 to that had lower and higher point lol !!

 

[abdelm]

Radiation is the only one that can travel in vacuum (sun rays), so the answer would be convection and conduction only. For the matches and battery, I chose chemical for battery and internal thermal for matches. The thermometer I did it 0 and 100, because the lower fixed point is the temperature of pure melting ice and upper fixed point is for the pure boiling water, so it will be 0 and 100 no matter whirr the thermometer starts. I cant remember the reversed battery thing.

 

[Zeinow]

The match question i did it both chemical because i think the match has energy tarnsformation from chemical to heat ( thermal) energry

 

[Zeinow]

Wat about the candle question and cathode and anode question ???

 

[wolf]

As far as i remember for anode question i've put "positive" charge for anode and "cold" for cathode ,and for candle question i guess arrow was going upwards since hot air always goes up due to its low mass compared to a cold air.

 

[Zeinow]

r u sure about the 'postive' and 'cold' bec some say its wrong!!.... i did the candle question like u

 

[wolf]

well , anode definetely has positive charge, nocomments.., and since cathode was earthed all of its current(source of heat) was transferred to earth, as a result the cathode got cold...

 

[Zeinow]

I did it like u but in this test http://www.xtremepapers.net/CIE/Cambrid ... 6_qp_1.pdf Q 37 the answer was +ve and cool but its for 'anode ' so i think the answer must be changed

 

[XPFMember]

well , anode definetely has positive charge, nocomments.., and since cathode was earthed all of its current(source of heat) was transferred to earth, as a result the cathode got cold...

but see you electrical appliances which have a three pin plug ,one of them is the earth pin so does this mean that when you connect them they dont work just because they are earthed so the current goes to earth....
well may be you r right ,i wrote D=>+ve and hot!!

 

[wolf]

well.... Mathangel, i didn't get a little bit what you've said, no offence=)) But probably you are right, who knows, and still even though in m/j 2006 the answer was that ANODE was cold it doesn't really mean that cathode should be hot.. Nvd.....=)) by the way what did you answer on question about barometer?

 

[XPFMember]

i wrote it decreases but not to zero

 

[wolf]

same=))) and what about wax graph question?

 

[XPFMember]

C.thermal energy is given out by wax
cuz for boiling we know all thermal energy is taken in at boiling point t change the state so i thought ,would be opposite for melting!!

 

[Zeinow]

wat about the electromagnet question ?? steel and iron... i wrote neither will be magnitised. Bec steel is hard to be magnitised and iron easliy looses its magnitism.however, others say steel is magnitised only

 

[wolf]

yes i wrote C too since the change from liquid to gas is exothermic therefore the energy was given out ,chemistry helped a little bit=))) Anyways good luck on your exams tommorrow, hope you will do well)

 

[XPFMember]

wat about the electromagnet question ?? steel and iron... i wrote neither will be magnitised. Bec steel is hard to be magnitised and iron easliy looses its magnitism.however, others say steel is magnitised only

same here....steel is magnetised i guess the qustion wud have mentioned that they become magnetised (not sure) btw wat did u write for the greatest hazard of bare wire..fire or electric shock...i had a confusion but i wrote shock!