IGCSE/GCSE/O & A Level/IB/University Student Forum
Qualification => GCE AS & A2 Level => Queries => Topic started by: 7ooD on May 12, 2010, 11:15:12 am
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relly bad exam only 3 papers to practice and half of the exam wasn't in these papers :-\
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wat was the answer to the resistivity and the first MCQ
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no exam discussion is allowed
until 24 hrs pass the exam time
By the way , i did that exam
it wasn't hard
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It wasn't so hard
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no exam discussion is allowed
until 24 hrs pass the exam time
By the way , i did that exam
it wasn't hard
ok sorry
By the way ya i agree it wasnt tht hard :S:S
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yes i kno it wasn't hard i was just angry because of the first question of water datz why :D
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u can discuss the paper
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Yeah, u're right, u're talkin about the international written alternative to practicals for as?? I did it as well, it wasnt that hard......However, I had a few doubts, u thnk u can clear them for me??
1. 1st MCQ...the current answer was 20 mA??
2. 3rd MCQ i think....the LDR one...what was the dependent variable?
3. What would be the 3 precautions 4 measuring reaction time?? I've written avoiding paralax error, and keeping the device vertical, but could u clarify this 4 me?
4. How would you draw the ray path through the glass block??
5. The sini/sinr does pass through the origin, right? But how would you explain why?
6. I got the refractive index as 1.59..Some others got it like me, while others got quite diff values like 1.39, 1.48, etc...U think tht's right??
I know its gonna be a pain to ans all this, but jus be concise....Thanks....
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1- i did it 10A but then i changed it to 20m dunno wat is the right answer
2- the dependent i did it distance because it changes
3-i did excatly like u lool i said look 90 degrees to avoid parrelex error and use a set square to make sure it is vertical and i said 1 more i dnt remember
4-i said put a ruler under the glass so that we can kno where is the light ray im sure im wrong :P
5-i said if i is 0 then r is 0 then sin0 is 0
6-i got 1.4 :D
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Yeah, u're right, u're talkin about the international written alternative to practicals for as?? I did it as well, it wasnt that hard......However, I had a few doubts, u thnk u can clear them for me??
1. 1st MCQ...the current answer was 20 mA??
2. 3rd MCQ i think....the LDR one...what was the dependent variable?
3. What would be the 3 precautions 4 measuring reaction time?? I've written avoiding paralax error, and keeping the device vertical, but could u clarify this 4 me?
4. How would you draw the ray path through the glass block??
5. The sini/sinr does pass through the origin, right? But how would you explain why?
6. I got the refractive index as 1.59..Some others got it like me, while others got quite diff values like 1.39, 1.48, etc...U think tht's right??
I know its gonna be a pain to ans all this, but jus be concise....Thanks....
dont double post
check here https://studentforums.biz/index.php/topic,7639.0.html (https://studentforums.biz/index.php/topic,7639.0.html)
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i chose 20mA as well
independent variable is distance and dependent is resistance, i suppose
our precautions match to some extent...in addition to that, i also wrote about repeating the procedure to find a mean value for reaction time ???
i wrote something like, tracing the rays and block on to the sheet of paper and then joining the points after removal of the block from the sheet
i said the graph will pass through the origin :-\ i justified it by saying its in y=mx format :-\ sounds stupid now..!
i don't remember the value for refractive index 8)
and umm does the question under reaction meter part says to find best mean? should we use consistent values only?
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As for the above rest, I agree with y'all...But I still think
1. The dependent variable for the LDR should be distance probably
2. Any correct sini/sinr graph must pass through the origin....Check this out.....http://www.thealy.com/LCPhysics/exp/exp06/snell_values.htm
3. As for my value of 1.59, that too should be just right as the previous mark scheme guidelines tell the examiner to allow for the ans between a max diference of 0.3........
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Independent variable is the variable controlled by the experimenter and dependent variable is the one that changes as a result..
In the question the experimenter changes distance (independent variable), and as a result resistance of LDR changes (dependent variable) ;)
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1.for the first MC Q. i put 20m,,dno if its right,..
2. independent variable was the intensity of the light since thats what they are controlling. They control this by changing the distance from the metal surface..distance is not the independant variable, for dependent variable i put resistance of LDR
3. for precautions of measuring reaction time i wrote:
1. Repeat nd take average
2. keep distance between thumb and finger the same each time
3. hold the carboard thing for measuring reaction time same distance above the persons thumb and fingers each time.
4. Ensure there are no distractions around the person- or same distractions etc.
4. Sini/Sinr passes through the origin since at an angle of incidence of 0 degrees i.e ray hits block at the normal, no refraction of the ray occurs and the ray passes straight through in a straight line. therefore, Sini/Sinr would be 0.
5. my refractive index was the gradient of the graph which was approx. 1.44...
thats all from me :)
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it ws such a weird paper ..... totally unlike the last 2 AND da specimen .... I scored 39 in da jan 2010 paper n 37 in the may 09 paper .... but for this .... i dont think i can even score above a 32 !!! God I hate edexcel !! N man I wish i gave da exam in jan :'( >:(
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i agree wiz u dunno why some ppl say it was easy
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COOL !
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I WARNED YOU ONCE ALREADY !
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24 hrs has passed!
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ok if 72 hrs have passed can anyone get us the paper plz last jan we got it after the exams
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OMG! this is sooooowww unfair..we got only 3 past papers, and the exam is harder then ever, as never expected..atleast the practical one was kinda better,,but PH01 totally screwed me up! aarrgghhh!
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OMG! this is sooooowww unfair..we got only 3 past papers, and the exam is harder then ever, as never expected..atleast the practical one was kinda better,,but PH01 totally screwed me up! aarrgghhh!
same here :( :(
hope we ace unit 2
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dnt worry unit 2 will be easiest cuz 2010 jan was hard
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I do not intend to scare any of you. But Take care of unit 2. It's quite tricky.
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i'm just giving physics unit 1 & 2 this time........well.. like others unit 1 was utter bullshit ........ unit 2 in jan 10 was actually hard but the raw grade boundary was 45 out of 80 for an A...
if this time if unit 2 is easy then raw grade boundary is definitely gonna be more than 50....i'm really scared because the exam is very close......
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well u found unit 1 dat easy???? ???
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well u found unit 1 dat easy???? ???
AARRRR did you?? anyways we didn't!! it was sucha freaking paper ( PH1) ! well ya..lets see how about the threshold marking scheme men.. oohh God..um beginning to hate Physics!!
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dnt worry edexcel in physics is generous they will let the curvez down but in math they are pain in the ***