Provide answers for the following questions from a model paper regarding SI units and experimental accuracy: Q.1 Discuss accuracy and precision with given data. Q.2 List SI base units (ampere, mole) a

For Group A:

For Group B:

Group A's average ($11.7 \text{ V}$) is $0.3 \text{ V}$ away from $12.0 \text{ V}$.
Group B's average ($12.1 \text{ V}$) is $0.1 \text{ V}$ away from $12.0 \text{ V}$.
Group B is more accurate because its average value is closer to the accepted value.

For Group A, the measurements range from $11.6 \text{ V}$ to $11.8 \text{ V}$.
For Group B, all measurements are $12.1 \text{ V}$.
Group B is more precise because its measurements are identical, indicating high reproducibility.

Q.2:

• SI Base Units:
  • (a) ampere (unit of electric current)
  • (b) mole (unit of amount of substance)
• Derived Units:
  • (c) cubic meter (unit of volume, derived from length: $\text{m}^3$)
  • (d) pascal (unit of pressure, derived from force and area: $\text{N/m}^2$)

Q.3:

• Definition of Torque: Torque is the rotational equivalent of force. It is a measure of the force that can cause an object to rotate about an axis.
• Mathematical Expression: $$\tau = r F \sin\theta$$ where $\tau$ is torque, $r$ is the distance from the pivot to the point where the force is applied, $F$ is the magnitude of the force, and $\theta$ is the angle between the force vector and the lever arm.
• Angle for Maximum Torque: Torque is maximum when $\sin\theta = 1$, which occurs at $\theta = \boxed{90^\circ}$.
• Angle for Zero Torque: Torque is zero when $\sin\theta = 0$, which occurs at $\theta = \boxed{0^\circ \text{ or } 180^\circ}$.

Q.4:

For the seesaw to be balanced, the clockwise torque must