practice 0822

Which set of measurements best represents accuracy if the true value is 6.80 kg?

• 6.10 kg, 5.99 kg and 6.11 kg
• 6.75 kg, 6.80 kg and 6.85 kg
• 6.80 kg, 6.70 kg and 6.90 kg
• 5.80 kg, 6.80 kg and 7.80 kg

A chemistry student is experimentally determining the boiling point of a substance. The experimental boiling points (in degree Celsius) are listed below. Which one should he discard so that he can say his data is precise?

• 58.8
• 59.0
• 56.3
• 59.1
• 58.5

If a measurement is precise, it must also be accurate.

• True
• False

Which set of measurements best represents precision if the true value is 9.81 m/s²?

• 9.80 m/s², 9.82 m/s², 9.81 m/s²

• 9.70 m/s², 9.90 m/s², 9.80 m/s²

• 9.81 m/s², 9.79 m/s², 9.83 m/s²

• 9.60 m/s², 9.81 m/s², 10.00 m/s²

Which of the following words is used to describe a set of measurements that are closely grouped together, but not necessarily close to the actual value.

• precise

• accurate

Which set of measurements best represents precision if the true value is 5.00 m?

• 4.99 m, 5.01 m, 5.00 m

• 4.90 m, 5.10 m, 5.00 m

• 5.00 m, 4.98 m, 5.02 m

• 4.80 m, 5.00 m, 5.20 m

A physics student is measuring the density of a liquid. The experimental densities (in g/cm³) are listed below. Which one should he discard so that he can say his data is precise?

• 1.02

• 1.00

• 0.98

• 1.01

• 1.03

Which of the following words is used to describe a set of measurements that are close to the actual value, but not necessarily closely grouped together.

• accurate

• precise

Which of the following sets of measurements best represents accuracy if the true value is 12.00 cm?

• 11.80 cm, 12.50 cm, 12.70 cm

• 11.00 cm, 12.00 cm, 13.00 cm

• 11.95 cm, 12.05 cm, 12.00 cm

• 12.10 cm, 12.20 cm, 12.30 cm

Which of the following best describes a set of measurements that are both accurate and precise?

• All measurements are close to each other and close to the true value.

• All measurements are close to each other but far from the true value.

• All measurements are spread out and far from the true value.

• All measurements are spread out but close to the true value.