Test on Scientific Data Collection and Experimental Errors

Question 1: To ensure your results are reproducible, you must exclusively take a second set of readings using the same instrument with a different observer.

A. Yes

B. No

Explanation: To make results reproducible, you can cross-check them by taking a second set of readings with another instrument OR a different observer. The statement incorrectly implies that using the same instrument is required, and that using a different instrument is not an option.

Question 2: Equipment calibration requires measuring a known value.

A. Yes

B. No

Explanation: Equipment needs to be calibrated by measuring a known value. A difference between the measured and known value allows for correction of the equipment's inaccuracy.

Question 3: According to the study materials, which statement best defines precise results?

A. The data is all really close to the mean (average) of your repeated results.

B. The results are really close to the true answer.

C. Similar results are obtained when readings are repeated at least three times.

D. The results can be cross-checked with another instrument or observer.

Explanation: The study materials state: 'Precise results are ones where the data is all really close to the mean (average) of your repeated results (i.e. not spread out).'

Question 4: A scientist needs to detect changes in mass as small as 0.5 g during an experiment. According to the study materials, which characteristic of the measuring equipment is most relevant to ensure these small changes can be accurately observed?

A. The equipment's repeatability, ensuring similar results on repeated trials.

B. The equipment's resolution, indicating the smallest change it can detect.

C. The equipment's accuracy, showing how close results are to the true answer.

D. The equipment's precision, reflecting how close data points are to their mean.

Explanation: The study materials state that 'The smallest change a measuring instrument can detect is called its RESOLUTION.' To detect changes as small as 0.5 g, the equipment must have a resolution sensitive enough for that specific measurement.

Question 5: Taking repeat readings and finding the mean will correct a systematic error.

A. Yes

B. No

Explanation: The study materials state that repeating the experiment and calculating a mean won't correct a systematic error. Instead, taking repeat readings and finding the mean can reduce the effect of random errors and make results more precise.