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these are good.I will try to put everything i have learned from doing past papers into nutshell.
Frequently examined question:
- theory suggests that resistance should be 10 ohm but in experiment value is 12. Given that experiment had no errors, does this experiment support theory?Experiment supports theory as the result is very close to theoretical value. it is not exact due to resistance of wire changes with time and the resistance of amm meter is not counted.
- Student has decided to repeat this experiment what she needs to keep constant?
(u can write any variable that affects the results such as) the volume of water in container, room temperature, the distance of string from centre.- Bottom of the object is not visible on the screen, how to adjust it?
object, image and lens should be in line(their horizontal axis must be same)- The image is not sharp(blurred), WHY is not sharp and HOW can u sharp this image?
It is not sharp as light from object does not meet at single point. u can correct it by adjusting screen/lens so that the screen is exactly at the focal distance of lens.- Why angle of incidence is not same as angle of reflection?
The lines were too thick. normal was not drawn accurately. parallax error- How to accurately measure the thickness of coins?
place atleast 10 coins. take their thickness. divide by 10. OR use micrometer screw guage.- Why it is not possible to take length XY with a single ruler?
because the blank space will affect accuracy of result therefore second ruler is needed to measure the blank-space and subtract it from final answer.- Why it is important for the rule to be very close to XY.
to take accurate reading by avoiding parallax error.- How to avoid parallax error?
By keeping line of sight perpendicular to the scale.- Why ammeter has been deflected to -2 written on other side of the zero?
wrong connection of terminals/positive wire connected with negative wire.- Why there are two negative terminals on a volt meter marked 3V and 10 V?When connected to 3V the range will be 0-3V and when connected to 10V the range will be 0-10V. it is useful for measuring accurately more ranges of voltages.
- The current is approximately 3 A. which range should student use, 0-10A or 0-5A.
the smallest range that can accommodate the required current. therefore 0-5A- How to measure the volume of irregular shaped object?
By putting fixed volume of liquid in measuring cylinder and taking the initial reading. then add object and take final reading. then subtract initial from final.- Why is resistance of R set to maximum before closing switch?
so that current is lowest on start and increased in decreasing resistance as more in needed. to avoid equipments from malfunctioning.- How to make sure the results are accurate?
1-the N oscilations and then divide the Tn By N to get T
2-Take many readings and average them.
3-Take reading for different values of I then plot I against V. draw a best fit and then find V/I(resistance)- Why the reading is taken for 20 oscillations?
to reduce human error in reading time. as average will be less affected as proportion of delay will be less in 20 oscilations.I will add more as i remember. i will add experiments and important tips as well..
