$$10.00 \times 2.54 = 25.4 cm$$

$$2.5 \times 1000 = 2500$$ grams

$$80 \times \frac{1000}{1} \div 3600$$

$$2 \times 3600 = 7200$$ seconds

Question 1

Which of the following is NOT a fundamental SI unit in the study of motion?

Accepted Answer

Force

Question 2

Why did the Mars Climate Orbiter mission fail in 1999?

Accepted Answer

Scientists confused English units and metric units.

Question 3

Convert 10.00 inches to centimeters using the correct conversion factor.

Accepted Answer

$$10.00 	imes 2.54 = 25.4 cm$$

Question 4

Which of the following best describes the definition of a second in the modern SI system?

Accepted Answer

The time it takes for a Cesium atom to vibrate 9,192,637,770 times

Question 5

A car is traveling at $$80 \ \mathrm{km/hr}. $$What is its speed in $$\mathrm{m/s}$$?

Accepted Answer

$$22.2 \ \mathrm{m/s}$$

Question 6

Which of the following is the correct conversion factor for changing miles to kilometers?

Accepted Answer

$$1 \ \mathrm{mile} = 1.6 \ \mathrm{km}$$

Question 7

If you have a mass of 2.5 kilograms, how many grams is this?

Accepted Answer

$$2.5 	imes 1000 = 2500$$ grams

Question 8

Which of the following statements about mass and weight is correct?

Accepted Answer

Weight is a force, while mass is the amount of matter in a substance.

Question 9

Convert $$3,000,000 \ \mathrm{cm}^3 to$$ $$\mathrm{m}^3.$$

Accepted Answer

$$3 \ \mathrm{m}^3$$

Question 10

Which of the following is the correct sequence for converting $$80 \ \mathrm{km/hr} to$$ $$\mathrm{m/s}$$?

Accepted Answer

$$80 	imes \frac{1000}{1} \div 3600$$

Question 11

Which of the following is a derived unit in the SI system?

Accepted Answer

Newton

Question 12

A scientist needs to convert 5 yards to feet. What is the correct calculation?

Accepted Answer

$$5 	imes 3 = 15$$ feet

Question 13

Which of the following is the correct definition of a kilometer?

Accepted Answer

One ten-thousandth the length of the meridian through Paris from the North pole to the equator

Question 14

If a box has a mass of 1 slug, what is the equivalent mass in kilograms? (1 slug ≈ 14.59 kg)

Accepted Answer

$$14.59 kg$$

Question 15

Which of the following is the correct conversion for 1 inch to centimeters?

Accepted Answer

$$1 \ \mathrm{inch} = 2.54 \ \mathrm{cm}$$

Question 16

A scientist measures a time interval as 2 hours. How many seconds is this?

Accepted Answer

$$2 	imes 3600 = 7200$$ seconds

Question 17

Which of the following is a reason why the metric system is preferred in science?

Accepted Answer

It is based on powers of ten, making conversions easier.

Question 18

If you need to convert $$5000 \ \mathrm{mg} to $$grams, what is the correct answer?

Accepted Answer

$$5000 \div 1000 = 5$$ grams

Question 19

Which of the following is the correct order of metric units from largest to smallest?

Accepted Answer

Kilometer, meter, centimeter, millimeter

Units in Science: Foundations and Conversions

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