Physical Quantities And Units All subtopics

Which statement correctly describes what every physical quantity must consist of?

Why is stating a length simply as “5” physically meaningless?

A classroom measures 10 m by 5 m by 4 m. Taking the density of air as 1.2 kg m⁻³, calculate the mass of air it contains.

Which value is a reasonable estimate for the speed of sound in air?

Which value is a reasonable estimate for the wavelength of visible light?

Which value is a reasonable estimate for atmospheric pressure at sea level?

A student estimates that a bag containing 10 apples has a mass of about 10 kg. Using a reasonable estimate for the mass of a single apple, which statement is correct?

Which value is the density of water?

The period of a typical human heartbeat is approximately 1 s. Estimate the number of heartbeats in one hour.

A person walks at a steady pace for 10 minutes. Using a reasonable estimate for walking speed, estimate the distance travelled.

Which value is a reasonable estimate for the diameter of a human hair?

A student calculates a weight correctly as 9.81 but writes no unit in the final answer. According to Cambridge mark schemes, what is the most likely consequence?

Which of the following is an SI base quantity?

Why is the kilogram considered unusual among the SI base units?

What is the newton (N) expressed in SI base units?

What is the watt (W) expressed in SI base units?

What is the pascal (Pa) expressed in SI base units?

What is the coulomb (C) expressed in SI base units?

What is the volt (V) expressed in SI base units?

When is a physical equation described as homogeneous?