Q 01/05

The kelvin is the base unit of temperature in which set of units?

A) The centimetre-gram-second (CGS) system

B) The International System (SI)

C) United States customary units

D) The British Imperial system

Answer · why

B) The International System (SI)

It is one of seven SI base units, and the only one whose scale starts at a true physical zero.

Q 02/05

What is the symbol for the kelvin?

A) °K

B) K

C) Kv

D) Kn

Answer · why

B) K

'Degree Kelvin' with the ° sign was officially dropped in 1967–68.

Q 03/05

What do you add to a Celsius temperature to convert it to kelvins?

A) 273.15

B) 373.15

C) 100.00

D) 459.67

Answer · why

A) 273.15

A one-kelvin step and a one-degree-Celsius step are exactly the same size.

Q 04/05

What temperature does 0 K represent?

A) The triple point of water

B) The boiling point of helium

C) Absolute zero

D) The freezing point of water

Answer · why

C) Absolute zero

It is the lowest possible temperature, the point at which classical particle motion would stop.

Q 05/05

What was Lord Kelvin's name before he was ennobled?

A) William Rankine

B) John Tyndall

C) James Clerk Maxwell

D) William Thomson

Answer · why

D) William Thomson

He was knighted in 1866 and became a baron in 1892.