XI PHYSICS SECTION – B
Q. 02 Q. 03
Accuracy and precision are both important concepts in the context of
measurements and data analysis, but they refer to different aspects
of the measurement process. Accuracy: Definition: Accuracy refers
to how close a measured value is to the true or actual value.
Example: If a thermometer reads 98°C when the actual temperature
is 100°C, Definition: Precision refers to how close the repeated
measurements are to each other, regardless of whether they are
close to the true value. High Precision: Measurements are close to
the true value and to each other. High Accuracy, Low Precision:
Measurements are close to the true value but scattered. Low
Accuracy, High Precision: Measurements are not close to the true
value but are consistent.Low Accuracy, Low Precision:
Measurements are neither close to the true value nor consistent.
Understanding the difference between accuracy and precision helps
in evaluating the quality of measurements and the reliability of data
analysis.
Q. 06
State Pascal's Principle.
Pascal's principle states that a change in pressure applied to an
enclosed fluid is transmitted undiminished to all portions of the fluid
and to the walls of its container.
Describe its two applications.
1. Hydraulic systems: Used in brakes, lifts, and heavy machinery.
2. Hydraulic press: Used in compressing materials, like in
manufacturing processes.
Q.09
Kirchhoff's Current Law (KCL)
Statement:
Kirchhoff's Current Law states that the total current entering a
junction (or node) in an electrical circuit is equal to the total current
leaving the junction. Mathematically, it can be expressed as:
Diagram:
Here is a simple diagram illustrating KCL:
I1
|
v
|
-----
| |
I2| |I3
| |
v v
At the junction, the sum of currents entering (I1) is equal to the sum
of currents leaving (I2 + I3):
\[ I1 = I2 + I3 \]
Kirchhoff's Voltage Law (KVL)
Statement:
Kirchhoff's Voltage Law states that the sum of the electrical potential
differences (voltage) around any closed loop or circuit is zero.
Mathematically, it can be expressed as:
Diagram:
