Physics 2016 JAMB Past Questions - Question 1: What is least possible error encountered when taking measurement with a meter rule ?

Correct Answer

B

Explanation

The least possible error encountered when taking measurements with a meter rule depends on the precision of the instrument and the skill of the person making the measurement.

1. **Instrument Precision**: The precision of a meter rule, which is also known as a ruler or a tape measure, depends on its markings. Common meter rules may have markings in millimeters (mm) or centimeters (cm). The smallest division on the meter rule represents the smallest unit you can reliably measure. For example, if your meter rule is marked in millimeters, the smallest possible error is ±0.5 mm, because you can estimate halfway between two markings.

2. **Parallax Error**: Another potential source of error when using a meter rule is parallax error. This occurs when the observer's eye is not directly in line with the measurement mark. Parallax error can lead to a slight shift in the reading, causing a measurement error. To minimize this error, ensure that you view the scale markings from directly above and align the object being measured with the scale.

3. **Reading Skill**: The person taking the measurement also plays a crucial role in minimizing errors. A skilled and experienced observer is less likely to make reading errors compared to someone who is less familiar with the instrument or measurement techniques.

4. **Environmental Factors**: Environmental conditions, such as temperature and humidity, can also affect the dimensions of the objects being measured. These factors can introduce errors, especially when making precise measurements.

In summary, the least possible error when taking measurements with a meter rule is typically limited by the smallest division on the rule itself. However, minimizing errors further depends on the observer's skill, technique, and attention to factors like parallax error and environmental conditions.