Physics p34 05 june 2014

[Alihayatlak]

Abdul Basit we are not supposed to suggest micrometer if we are using calipers. beacuse thats a change in experiment not an improvement. markschemes reject this too. anyways thats what i think and my opinion does'nt matter

 

[Shaoli Hassan]

In my centre most people took 2 mm as certainty. One was least divisiom while the other 1 was uncertainty in the mid point of sphere. Mine was 10.5%.

What were the limitations and improvements?

Yup, same here I took 2mm as the uncertainty too.....

 

[Shaoli Hassan]

I wrote for limitations: i) Two sets of readings are not enough ii) Large percentage uncertainty in values of e iii) Rule may not be horizontal while measuring l iv) Parallax error may occur while measuring x

For improvements: i) Take more readings and plot a graph ii)Take larger values of e iii) Use a set square to make the rule horizontal iv) Use a travelling microscope

 

[Shaoli Hassan]

I guess I might have made a mistake while calculating the radius....I think I measured the diameter and kept it as such. Can anyone give me an idea as to how many marks I might lose.....

 

[maestro maisam]

Guys i made a blunder in Ques2 by dividing all the values in "mm" by 10 to convert them into "cm" instead of multiplying them by 10... Will i get ecf on this and how many marks will i lose on this..

 

[Abdul Basit]

Guys i made a blunder in Ques2 by dividing all the values in "mm" by 10 to convert them into "cm" instead of multiplying them by 10... Will i get ecf on this and how many marks will i lose on this..

You will lose max 2 marks 1 for distance L and e. And 1 for X.

 

[maestro maisam]

You will lose max 2 marks 1 for distance L and e. And 1 for X.

what about the radius part??