Question 1

An exact number is a measured value of an estimate or a calculation.

Accepted Answer

An exact number is a value that is known with complete certainty, without any approximation or estimation involved.

Question 2

As per the 2010 census, the United States population is estimated to be 308.70 million. This measurement has four significant figures.

Accepted Answer

False

Question 3

Significant figures represent the limits of what values of a measurement or a calculation we are sure of.

Accepted Answer

Significant figures in a measurement or calculation indicate the precision of the measurement or calculation, representing the digits that are known with certainty plus the first digit that is uncertain.

Question 4

The number '0.006608' has six significant figures.

Accepted Answer

The number '0.006608' has four significant figures, as leading zeros are not counted as significant figures.

Question 5

If the operations being performed are multiplication or division, the answer has to be limited to the number of significant figures that the data value with the most number of significant figures has.

Accepted Answer

When performing multiplication or division, the answer should be limited to the number of significant figures in the data value with the least number of significant figures, not the most.

Question 6

Density is a physical property that is defined as a substance's mass divided by its volume.

Accepted Answer

Density is indeed a physical property that is calculated by dividing the mass of a substance by its volume, typically expressed in units such as grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³).

Question 7

One cubic centimeter is equal to a milliliter.

Accepted Answer

One cubic centimeter (cm³) is exactly equal to one milliliter (mL) in volume.

Question 8

Conversion factor refers to a fraction that can be used to convert a quantity from one unit to another.
18. 555 nm is equivalent to 0.555 mm.

Accepted Answer

555 nm (nanometers) is equivalent to 0.555 µm (micrometers), since 1 nm = 0.001 µm, and 0.555 µm is also equivalent to 0.555 mm (millimeters) when considering the conversion factor of 1 µm = 0.001 mm.

Question 9

The following calculation is performed with the proper number of significant figures. 124 × 10.45 = 1290

Accepted Answer

The answer is correct because the number of significant figures in the answer is the same as the number of significant figures in the number with the fewest significant figures (10.45).

Question 10

Standard notation is an expression of a number using powers of 10.
2. 0.000411 is an example of using standard notation to express a number.

Accepted Answer

Standard notation refers to expressing numbers in their usual decimal form without using powers of 10, and 0.000411 is already in standard decimal form, not expressed using powers of 10.

Question 11

Temperature is a measure of the average amount of static energy a system contains.

Accepted Answer

Temperature is a measure of the average kinetic energy of the particles in a system, not static energy.

Question 12

The multiplicative amount of the prefix nano is one thousand.

Accepted Answer

The multiplicative amount of the prefix nano is one billionth, or 10^-9.

Question 13

The number '8.6090 x 10³^' has only four significant figures.

Accepted Answer

The number '8.6090 x 10^51' has five significant figures (86090), as all non-zero digits and zeros between significant figures are counted.

Question 14

If the expression X+Y=Z is valid, 10X+10Y=10Z is also valid.

Accepted Answer

Multiplying each term of the equation X + Y = Z by 10 maintains the equality, resulting in 10X + 10Y = 10Z.

Question 15

On the Fahrenheit scale, the freezing point of liquid water is 32°F, and the boiling point of water is 212°F.
22. 0°F is equivalent to -32°C.
23. 30°C is the Celsius equivalent of 86°F.

Accepted Answer

The freezing point of liquid water is 32°F, which is equivalent to 0°C.

Question 16

Meter is the SI unit of measuring length of an object.

Accepted Answer

The meter is the base unit of length in the International System of Units (SI), used globally to measure the length or distance of an object.

Question 17

The number 9.666 × 10⁶ has four significant figures.

Accepted Answer

The number 9.666 × 10^6 has four significant figures: 9, 6, 6, and 6.

Question 18

Volume of a vessel is measured using a derived unit.

Accepted Answer

Volume is a derived unit because it is calculated by multiplying length measurements in three dimensions (length, width, and height), typically resulting in cubic meters (m³), cubic centimeters (cm³), liters, etc., rather than being based on a fundamental unit of measurement.

Question 19

Zeros at the end of a number without a decimal point are considered significant.

Accepted Answer

Zeros at the end of a number without a decimal point are not considered significant; they are often placeholders indicating the scale of the number.

Question 20

Any nonzero digit in a measurement is considered significant.

Accepted Answer

Nonzero digits always count as significant figures because they contribute to the precision of the measurement.

Quiz 2: Measurements