"How do you calculate the rise and fall of a temperature? Also, Question 1, Q.3B, 4B how do you take the measurements?, 2009 OCT/NOV, i can't seem to understand what to do exactly. Also, what to do when you are asked to draw to rectangular blocks to measure something?
Thats all of my doubts of paper 6. Went through 2003 - 2009 and found that these are my problems."
This is my post, i hope most of it gets answered, thanks 
For example, a beaker of water is at 20 deg. C. After adding a heated metal at 100 deg. C, the temp of the water is 32 deg. C, suppose.
temperature rise of the water will be: Final - Initial = 32 - 20 = 12 deg. C.
Similarly, as the temp of the water is now 32, and the heated metal was at 100 deg. C, it's fall in temp will be: Initial - Final = 100 - 32 = 68 deg. C.
For the measurements of Q4 B,
they've asked you to take an average value.
Attempt measuring the diameter of the lens, first horizontally, then vertically.
You might seem to be getting two different values.
Take the average of those values, i.e 1st + 2nd/2 .
