Physical quantities and units 4

What is a reasonable estimate for the density of sand?

• 2 x 10² g cm^-3

• 2 x 10³ g cm^-3

• 2 x 10¹ kg m^-3

• 2 x 10³ kg m^-3

Which physical quantity could have units of N s² m^–1?

• acceleration

• force

• mass

• momentum

The table shows some measurable quantities.

Which row gives the correct order of magnitude of the measurable quantity in the stated unit?

• A

• B

• C

• D

A byte (b) comprises 8 bits.

How many bits are there in 1 terabyte (1Tb)?

• 1 x 10⁹

• 8 x 10⁹

• 1 x 10¹²

• 8 x 10¹²

A wave has a frequency of 5 GHz.

What is the period of the wave?

• 200 ps

• 2 ns

• 20 ns

• 20000 μs

At temperatures close to 0 K, the specific heat capacity c of a particular solid is given by c = bT ³, where T is the temperature and b is a constant, characteristic of the solid.

The SI unit of specific heat capacity is J kg^–1 K^–1.

What is the unit of constant b, expressed in SI base units?

• m² s^-2 K^-3

• m² s^-2 K^-4

• kg m² s^-2 K^-3

• kg m² s^-2 K^-4

Four students measure a time interval that is known to be 1.734 s.

The measurement recorded by each student is shown.

Which measurement is the most accurate?

• 1 s

• 1.7 s

• 1.83 s

• 1.604 s

Find the reading of the vernier caliper on the diagram.

Find the reading of the vernier caliper on the diagram.

Find the reading of the vernier caliper on the diagram.