GP1Q1.1

The current definition of the standard meter of length is based on

• the distance between the earth's equator and north pole

• the distance between the earth and the sun

• the distance traveled by light in a vacuum

• the length of a particular object kept in France

The current definition of the standard second of time is based on

• the frequency of radiation emitted by cesium atoms

• the earth's rotation rate

• the duration of one year

• the oscillation of a particular pendulum kept in France

The current definition of the standard kilogram of mass is based on

• the mass of the earth

• the mass of the sun

• the mass a particular object kept in France

• the mass of a cesium-133 atom

If a woman weighs 125 lb, her mass expressed in kilograms is x kg, where x is

• less than 125

• greater than 125

If a tree is 15 m tall, its height expressed in feet is x ft, where x is

• less than 15

• greater than 15

If a flower is 6.5 cm wide, its width expressed in millimeters is x mm, where x is

• less than 6.5

• greater than 6.5

If an operatic aria lasts for 5.75 min, its length expressed in seconds is x s, where x is

• less than 5.75

• greater than 5.75

Scientists use the metric system chiefly because it is more accurate than the English system.

• True

• False

When adding two numbers, the number of significant figures in the sum is equal to the number of significant figures in the least accurate of the numbers being added.

• True

• False

When determining the number of significant figures in a number, zeroes to the left of the decimal point are never counted.

• True

• False