discussssss the ATP PHYSICSSSSSSS

[UxaiR]

angle of incidence 33` Confirm.! =D

 

[jafar]

@madiha : ya i thnk i wid be wrong b/c it ws asked how will we be able to take more accurate reanding, to get accurate reading sensitivity will be increased not renge

 

[miracle]

2nd box and the one tht said to take the readin as soon as the oil is heated

 

[Balaj Hassan]

the angle of incidence in the last question was 30`C to 34`C :mrgreen: --- above or below that is wrong

the answer of the question why oil shouldbe heated gently was because `oil is flammeble and itx dangerous to over heat it!! .


DOES ne one no the answr of the question in which it was asked how d varies to t??

i wrote that it wud be directly propotional :?

I think u your answer to why heat the oil gently is wrong ithey have not told us what oil it is and whether or not its flammable.
I wrote that oil's temperature rises quickly and to get required temperature it was to be heated gently so that on right temperature the bunsen can be turned off or oil withdrawn from heating.

 

[jafar]

allthe oils are falmmable 8 high temperature...

 

[Balaj Hassan]

even if you are right is my answer right as well???
cuz in atp there are more than one answer to almost all questions.

 

[jafar]

ya ur asnswer is also right,
in order 2 get the right readin we will have to heat it gently

 

[Deeva]

Which options did u tick?

 

[UxaiR]

first two options .! =)

 

[jafar]

i also did first 2....

 

[habib123]

the range was between 100 and 110*c

 

[JAMES SMITH]

THE ANSWER WAS 110 AS THE QUESTION WAS ABOUT STANDARD LABORATORY THERMOMETER
2 AND 4 BOX WERE TO BE TICKED THIS WAS FROM MAY/JUNE 2007
AND 38 IS ALSO CORRECT
WHAT DID U WRITE ABOUT THE METRE RULE HELD AT 50CM TIME PERIOD CANNOT BE MEASURED?

 

[JAMES SMITH]

In da starting, i tickd da first two boxes... but then i crossed da ans wid large sensitivity (i.e 1st box) and finally ticked da 2nd box and da box wid large range...
Will it b wrong ??

2 AND 4 WERE CORRCET 100% CONFIRMED FACT

 

[miracle]

my angel on incidence was 32.5 and reflection was 28

 

[Zishi]

my angel on incidence was 32.5 and reflection was 28

Oh my god, same here! My angle of incidence was also 32.5, but I thought that it may get wrong, so I wrote 32. 32 is also right, eh?

 

[sasukeuchiha]

my angel on incidence was 32.5 and reflection was 28

Oh my god, same here! My angle of incidence was also 32.5, but I thought that it may get wrong, so I wrote 32. 32 is also right, eh?

:idea: angle is given upto 1 decimal place
:?: i think i checked the 2nd and 4th box,, are they alright?

 

[JAMES SMITH]

yes 2 and 4 r correct
eng paper was xtremely easyy

 

[jafar]

THE ANSWER WAS 110 AS THE QUESTION WAS ABOUT STANDARD LABORATORY THERMOMETER
2 AND 4 BOX WERE TO BE TICKED THIS WAS FROM MAY/JUNE 2007
AND 38 IS ALSO CORRECT
WHAT DID U WRITE ABOUT THE METRE RULE HELD AT 50CM TIME PERIOD CANNOT BE MEASURED?

it was because, it will be at equilibrium nd thus will go round 360* when pushed

 

[Angraiz]

2 AND 4 WERE CORRCET 100% CONFIRMED FACT

2 was using 2 students right?

I think the last 2 boxes were right, namely taking a wide range of readings, and transferring the oil quickly to the beaker.

Why was number 2 wrong? Because:
2 people should/are used for experiments when 2 quantities have to be measured, or 2 tasks have to be done in a SHORT amount of time, i.e less than a few seconds. 1 person cannot do both tasks within the time, so 2 people are used.

In this experiment, the tasks were to heat the oil, take its temperature, transfer it to the beaker, and then take the temperature of the oil every 30 seconds (I think). This is not a short amount of time, and all these tasks can be EASILY performed by 1 person, without it causing any inaccuracies in the experiment.

Number 4; taking wide range of readings was right because taking many readings results in a more accurate graph being plotted, thus a clearer picture of the rate of cooling can be obtained, which is what you need.

Number 5: Transferring the oil quickly to the beaker was important because not doing this will make the experiment inaccurate. Suppose the oil is heated and the temperature is 69. If transferring takes a while, the temperature will decrease, and the actual temperature will be lesser than 69, say 68, and will result in an inaccurate graph being plotted. Transferring it quickly will ensure that the temperature of the oil measured is indeed the actual temperature of the oil when it is cooled in the beaker.

A.

 

[sahar]

is 100 degree da wrong answer for the frst question last part ??!