Precision and Accuracy

Q.

An analytic balance has uncertainty In measurement equal to $\pm$1 mg. Then report the result in terms of percentage if the weight of a compound is
(a) 1 g
(b) 10 g
(c) 100 g

1. 

2. 

3. ;

4. 

Q.

In a kingdom there was an excellent archer. The ruler was jealous of his archery skills, so he decided to put his skills to test. The archer was asked to shoot an apple which was placed on his son's head or else his son will be killed. The archer always used his trusted bow.

Case 1: In practice shots he always hits the apple. In this case the archer is:

1. Accurate

2. Precise

3. Both a & b

4. none

Q.

In a kingdom there was an excellent archer. The ruler was jealous of his archery skills, so he decided to put his skills to test. The archer was asked to shoot an apple which was placed on his son's head or else his son will be killed. The archer always used his trusted bow.

Now that his son's life was in his hands the archer's hand started to tremble. So, now when he started shooting with the original bow he hit different spots which were close to the apple. In this case the archer is:

1. Accurate

2. Precise

3. Both a & b

4. none

Q.

The students are given a vernier calipers to measure the outer diameter of a cylinder. The actual outer diameter is 4 cm. The measurements made are given in the following table:
$\begin{array}{cccccc}Student& Measurements& & & & \\ & 1& 2& 3& 4& 5\\ A& 4& 4& 4& 4& 4\\ B& 3.5& 3.6& 3.7& 3.8& 3.65\\ C& 3.7& 3.9& 4.1& 4.3& 4\\ D& 3.6& 4.2& 4.4& 4.8& 4.25\\ E& 4.005& 3.995& 4.05& 3.95& 4\end{array}$

In case B, the measurements are said to be:

1. Highly Accurate

2. Highly Precise

3. Both a & b

4. none