Qualification > Queries
How were the exams?(Edexcel)
Black Kitty:
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....
T.Q:
--- Quote from: Black Kitty on May 13, 2010, 10:32:19 am ---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....
--- End quote ---
for the FIRST MCQs i answered B which is 20 m , and for the 3rd one the answer is light intensity
for the precautions, i wrote , repeat/ take average , avoid parrlex error , make sure the ruler is vertical
for the line , u have to say that u make two marks on the block where the light is passing into the block
and out of the block , and then remove the block ,and draw a line between the two marks
also , i said it shouldn't pass , because refractive index will be zero their
i got the refractive index = 1.4
Darth Austrakast:
i wrote 20 mA
dependent variable would be resistance
well my precautions matches with yours........
rays can me drawn by tracing the light and marking its bath with crosses and then by joining the crosses
my refractive index was 1.46
T.Q:
--- Quote from: Austrakast on May 13, 2010, 10:49:42 am ---
dependent variable would be resistance
--- End quote ---
independent was the distance
dependent was the light intensity
7ooD:
tq i dnt kno if repeat n take average is corret cuz it is reaction so every time it may be diff i said check for zero error instead :p
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