SI units and derived quantities PRE-TEST

The diagram shows part of a ruler. The ruler is used to find the length of a nail.

What is the length of the nail?

• 2.2 cm

• 2.7 cm

• 3.2 cm

• 3.7 cm

Answer explanation

The ruler shows the nail measures just past the 2.5 cm mark, specifically at 2.7 cm. Therefore, the correct length of the nail is 2.7 cm.

Four athletes run twice around a track. The table shows their times at the end of each lap. Which athlete runs the second lap the fastest?

• A

• B

• C

• D

Answer explanation

To determine which athlete ran the second lap the fastest, we compare the lap times. Athlete D has the lowest time for the second lap, indicating they ran it the fastest among all athletes.

SI stands for ___.

• Sports Illustrated

• Scientific Notation

• International System (of measurements)

• Instructional System (of measurements)

Answer explanation

SI stands for International System of Units, which is a standardized system of measurements used globally in science and industry. The other options do not accurately represent the abbreviation SI.

What is derived quantities ?

• a tendency to do nothing or to remain unchanged.

• combination of two or more base quantities

• the quantity of motion of a moving body, measured as a product of its mass and velocity.

Answer explanation

Derived quantities are defined as a combination of two or more base quantities. For example, speed is derived from distance and time, illustrating how multiple base quantities can create new measurements.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS3-1

NGSS.MS-PS3-4

The SI base unit is

• second

• minute

• millisecond

• hour

Answer explanation

The SI base unit of time is the second. It is the fundamental unit from which other time measurements, like minutes and hours, are derived. Therefore, the correct answer is second.

What SI Unit is used for Volume

• Ounce

• Liter

• Cup

• Gram

Answer explanation

The SI unit for volume is the liter. Unlike ounces, cups, and grams, which measure different quantities, the liter specifically quantifies volume, making it the correct choice.

What SI Unit is used for Mass

• Pound

• Ounce

• Meter

• Gram

Answer explanation

The SI unit for mass is the gram. Other options like pound and ounce are units of mass but not part of the SI system, while meter is a unit of length. Therefore, the correct answer is gram.

How many millimeters are in 1 cm?

• 1

• 10

• 100

• 1000

Answer explanation

There are 10 millimeters in 1 centimeter. This is because the metric system is based on powers of ten, where 1 cm equals 10 mm.

How many centimeters are in a meter?

• 1

• 10

• 100

• 1000

Answer explanation

There are 100 centimeters in a meter. This is a standard conversion in the metric system, where 1 meter is defined as equal to 100 centimeters.

How many milliliters are in 1 liter?

• 1

• 10

• 100

• 1000

Answer explanation

There are 1000 milliliters in 1 liter, as 1 liter is defined as 1000 milliliters. Therefore, the correct answer is 1000.