JEE · Physics · Experimental Skills doubts
8 doubts found
My screw gauge shows a positive reading when fully closed. What correction should I apply?
That nonzero closed reading is a positive zero error.
How should I use a graph to find an experimental constant reliably?
First rearrange the physical law into y = mx + c and decide what each axis represents.
What does “Least count and instrument reading” actually mean in Experimental Skills, and why does it matter for JEE?
An instrument cannot honestly resolve changes smaller than its least count. A final reading combines the main-scale reading, coinciding-division contribution, and the zero-error correction with correct sign.
I keep getting “Least count and instrument reading” questions wrong in Experimental Skills. What's the trap?
adding a positive zero error instead of subtracting it from the observed reading.
What does “Accuracy, precision and uncertainty” actually mean in Experimental Skills, and why does it matter for JEE?
Accuracy means closeness to the accepted value; precision means repeatability. Repeated measurements can reduce random uncertainty but cannot remove a systematic calibration error.
I keep getting “Accuracy, precision and uncertainty” questions wrong in Experimental Skills. What's the trap?
calling tightly clustered but shifted readings accurate.
What does “Graph slope and intercept” actually mean in Experimental Skills, and why does it matter for JEE?
A graph can transform a law into y = mx + c. The slope must be calculated with two well-separated points on the best-fit line, not necessarily two raw data points, and it carries units.
I keep getting “Graph slope and intercept” questions wrong in Experimental Skills. What's the trap?
using the visual angle of a plotted line as its physical slope.