Understanding Units in Physics

What is the primary focus of the first video lecture in IB Physics?

• The history of physics

• The laws of motion

• The concept of energy

• The importance of units

Which of the following is NOT a fundamental SI unit?

• Meter

• Liter

• Kilogram

• Candela

How was the meter originally defined?

• As the length of a pendulum swing in one second

• As the distance light travels in a vacuum in a fraction of a second

• As the distance from the North Pole to the equator

• As the length of a forearm

What is a derived unit?

• A unit that is no longer in use

• A unit that is used only in chemistry

• A unit that is based on human body measurements

• A unit that is a combination of fundamental SI units

How is velocity expressed in terms of fundamental SI units?

• Amperes per second

• Meters per second

• Kilograms per meter

• Seconds per meter

In IB Physics, how are fractional units presented differently?

• Using decimals

• Using fractions

• Using negative exponents

• Using positive exponents

What is the main advantage of the metric system?

• It is based on the human body

• It uses complex arithmetic

• It is only used in Europe

• It is easy to convert between units

Which prefix represents a factor of 10^6 in the metric system?

• Giga

• Mega

• Milli

• Kilo

If you convert 900 nanometers to meters, what is the result?

• 0.0009 meters

• 900 billion meters

• 0.0000009 meters

• 900 trillion meters

What is the correct conversion for 250 grams to kilograms?

• 2.5 kilograms

• 0.25 kilograms

• 2500 kilograms

• 25 kilograms