Mechanical SI Units and Prefixes KS3

What unit is used to measure length in the SI system?

• Gram

• Meter

• Liter

• Kilogram

Which prefix means "one hundred" in the SI system?

• Centi

• Deci

• Kilo

• Mega

How many centimeters are in a meter?

• 10

• 100

• 1000

• 10000

Answer explanation

There are 100 centimeters in a meter, so the correct answer is 100.

What is the SI unit for mass?

• Meter

• Liter

• Kilogram

• Newton

Answer explanation

The SI unit for mass is the kilogram. It is the base unit of mass in the International System of Units (SI).

To convert kilometers to meters, you should:

• Divide by 1000

• Multiply by 100

• Multiply by 1000

• Divide by 100

Answer explanation

To convert kilometers to meters, you should multiply by 1000. This is because there are 1000 meters in 1 kilometer.

60kg = ___ g

(Type only the number.)

What is the SI unit of time?

• Second

• Minute

• Hour

• Day

Which prefix represents a million times a unit?

• Micro

• Milli

• Mega

• Giga

648 g = ____ mg

(Type only the number)

How many grams are in a kilogram?

• 10

• 100

• 1000

• 10000

Answer explanation

There are 1000 grams in a kilogram, so the correct answer is 1000.