Understanding Measurements and Significant Figures

What is the main difference between qualitative and quantitative observations?

• Quantitative observations do not require any instruments.

• Quantitative observations are less accurate than qualitative ones.

• Qualitative observations are based on sensory input, while quantitative are numerical.

• Qualitative observations are numerical, while quantitative are descriptive.

Why is there always some degree of uncertainty in measurements?

• Because measurements are always rounded.

• Because scientists often make mistakes.

• Because no measuring device is perfect.

• Because all measurements are guesses.

What does the zero in the measurement 7.50 indicate?

• It is a placeholder with no significance.

• It indicates the measurement is rounded.

• It shows the measurement is precise to the hundredth place.

• It is an error in the measurement.

What does a significant figure represent in a measurement?

• The certainty of the measurement.

• The importance of the measurement.

• The precision of the measurement.

• The accuracy of the measurement.

Why is it important to report all digits in a measurement?

• To communicate the precision of the instrument used.

• To make the measurement look more complex.

• To ensure the measurement is accurate.

• To avoid any measurement errors.

Which of the following numbers has three significant figures?

• 524

• 25,000

• 9,201

• 0.03

In which scenario are trailing zeros considered significant?

• In numbers with leading zeros.

• In numbers without a decimal point.

• In numbers with a decimal point.

• In any large number.

What is the significance of sandwiched zeros in a number?

• They are significant because they are between non-zero numbers.

• They are always insignificant.

• They indicate a measurement error.

• They are placeholders and not significant.

Which of the following is true about leading zeros?

• They are always significant.

• They are significant only in decimal numbers.

• They are not significant and serve as placeholders.

• They indicate the precision of a measurement.

How should you report the result of an addition or subtraction calculation?

• With the same number of significant figures as the number with the most significant figures.

• With the same number of decimal places as the number with the least decimal places.

• With the same number of decimal places as the number with the most decimal places.

• With the same number of significant figures as the number with the least significant figures.