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.

(a)  

Find the reading of the vernier caliper on the diagram.

(a)  

Find the reading of the vernier caliper on the diagram.

(a)