Measurement, Quantities, & Units

It is the activity of obtaining and comparing physical quantities of real-world objects and events.

• Comparison

• Experimentation

• Generalization

• Measurement

This pertains to a precision instrument used in measuring the thickness of a strand of hair.

• Metric ruler

• Micrometer caliper

• Tape measure

• Vernier caliper

The accepted density of water at 4 °C is estimated at 1 g/cm³. When computed after performing an experiment, it yields a value of 1.03 g/cm³. Which of the following refers to the percentage error of the measurement? Note: The result is absolute.

• 0.03

• -0.03

• 3

• -3

The true value for the acceleration due to gravity is 9.81 m/s², while the experimental value measures 9.79 m/s². What is the actual error in the measurement?

• 0.002

• 0.02

• 0.2

• 2

The least count is the smallest value in the measured quantity that can be resolved on the instrument's scale.

• True

• False

How many scales does a Vernier caliper have?

• 1

• 2

• 3

• 4

 

What is the length of the rod?

• 3.3 cm

• 3.30 cm

• 3.36 cm

• 3.40 cm

Which of the following pertains to the depth rod?

• 4

• 8

• 12

• 3

What is the least count of the ruler in inches?

• 1 inch

• 0.125 inches

• 0.5 inches

• 1 inch

 

It is the agreement of a set of results among themselves, and it is measured in terms of deviation.

• Accuracy

• Precision