Significant Figures Quiz

What is the primary purpose of significant figures in scientific measurements?

• To increase the value of measurements

• To make calculations more complex

• To communicate the reliability and precision of measurements

• To ensure measurements are always exact

When reading a thermometer, why is an estimated digit added?

• To confuse the reader

• To ensure the reading is always a whole number

• To account for the uncertainty between marked values

• To make the reading look more precise

How many significant figures are in the measurement 28.6 degrees with an estimated digit?

• Five

• Two

• Three

• Four

What is the significance of trailing zeros in a number with a decimal point?

• They are always insignificant

• They are significant as they indicate precision

• They are only significant if they are between non-zero digits

• They are significant only if the number is a whole number

How are leading zeros treated in a number with a decimal point?

• They are significant only if the number is a whole number

• They are only significant if followed by a non-zero digit

• They are significant

• They are insignificant

What is the rule for significant figures in exact numbers?

• They have unlimited significant figures

• They have a limited number of significant figures

• They have the same number of significant figures as measured numbers

• They have no significant figures

How should significant figures be handled in multiplication and division?

• The result should have one more significant figure than the number with the least significant figures

• The result should have as many significant figures as the number with the most significant figures

• The result should have as many significant figures as the number with the least significant figures

• The result should have one less significant figure than the number with the most significant figures

In addition and subtraction, how is the number of decimal places in the result determined?

• By the average number of decimal places

• By the number with the most significant figures

• By the number with the least decimal places

• By the number with the most decimal places

What is the correct way to express 2000 with two significant figures using scientific notation?

• 2 x 10^3

• 2.0 x 10^3

• 2.00 x 10^3

• 2.000 x 10^3

If a cube of iron has a density of 7.87 g/cm³ and occupies 226 cm³, what is its mass in kilograms rounded to three significant figures?

• 1.779 kg

• 1.78 kg

• 1.8 kg

• 1.780 kg