Scientific Measurement

Question 1

How many significant figures are in the measurement 0.020 km?a.1b.2c.3d.4

Revolt · Accepted Answer

B

Question 2

Which of the following is not one of the three principles from which the metric system is based? a. There is one unit for each measurable quantity. b. Prefixes are used to signify multiples of each unit. c. Metric measurements cannot be converted to any other form of measurement. d. The basic units are related to each other. Please select the best answer from the choices provided

Revolt · Accepted Answer

C

Question 3

A number should be rounded up if _______.a.it is the first digit b.the number after it is between 0 and 4c.the number after it is between 5 and 9d.it is the last digit

Revolt · Accepted Answer

C

Question 4

What is 0.25 kilometers expressed in centimeters?a.25000 cmb.250 cmc.0.000025 cmd.2500 cm

Revolt · Accepted Answer

A

Question 5

How do the prefixes in the metric system relate to the basic units?

Revolt · Accepted Answer

Prefixes show powers-of-ten multiples or fractions of the basic unit. For example, a kilometer is 1,000 meters, a centimeter is one-hundredth of a meter, and a millimeter is one-thousandth of a meter.

Question 6

Explain why scientists use the metric system for scientific measurements.

Revolt · Accepted Answer

Scientists use the metric system because it is internationally standardized, based on powers of ten, and easy to convert between units. This makes scientific measurements consistent and allows scientists around the world to compare results.

Question 7

What is the difference between accuracy and precision and which is most important to scientific measurement?

Revolt · Accepted Answer

Accuracy is how close a measurement is to the true or accepted value. Precision is how close repeated measurements are to one another. Both are important, but accuracy is usually most important because a result must be close to the true value to be correct.

Question 8

When converting from kilometers to meters, the decimal is moved _______.a.three places to the leftb.two places to the leftc.three places to the rightd.two places to the right.

Revolt · Accepted Answer

C

Question 9

What are the basic prefixes used in the metric system and how do they relate to the size of the base unit?

Revolt · Accepted Answer

The basic prefixes include kilo-, hecto-, deka-, deci-, centi-, and milli-. They represent 1,000, 100, 10, one-tenth, one-hundredth, and one-thousandth of the base unit, respectively.

Question 10

Explain why significant figures represent the precision of a measurement and not its accuracy.

Revolt · Accepted Answer

Significant figures represent precision because they show the level of detail and certainty in a measurement. They do not represent accuracy because a measurement can have many significant figures and still be far from the true value.

Scientific Measurement Answers

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