IIT JEE 2008 P1 Q24

10 Answers

11
rkrish ·

One doubt bhaiyya....

If I have two readings of which one has more precision & the other has more accuracy , which has more error ????

62
Lokesh Verma ·

The one with more accuracy has lesser error..

11
rkrish ·

Ans. : B

g = 4Î 2L/T2

Λg/g = ΛL/L + 2 ΛT/T

E1 = [ 0.1/64 + 2*0.1/128 ]*100 = 5/16 %
E2 = [ 0.1/64 + 2*0.1/64 ]*100 = 15/32 %
E3 = [ 0.1/20 + 2*0.1/36 ]*100 = 19/18 %

Hence ans is B

11
rkrish ·

thnx bhaiyya.

One more thing...
can we give the ans to this ques. directly by saying that no. of oscillations in I is maximum , so error will be minimum ????

62
Lokesh Verma ·

no rkrish..

that is wrong method.. i mean your post 5

11
Subash ·

one more thing

so number of trials never comes into picture unless there is same value of percentage error for two different cases?????

62
Lokesh Verma ·

it comes subash

see ΔT/T values used..

11
rkrish ·

But bhaiyya.....isnt it true that more no. of observations minimises error.

11
Subash ·

okie i see it now

62
Lokesh Verma ·

it does rkrish...

but that cannot alone be the reason.. suppose the errror in the length was too large

i willl give a very hypothetical case

the length of the pendulum was as small as its error... then what would you have done?

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