Q 01/05

What is the SI unit of measurement for heat?

A) Joule

B) Calorie

C) Watt

D) Kelvin

Answer · why

A) Joule

Heat is a process quantity: a system does not 'contain' it, it transfers it.

Q 02/05

The SI unit of energy is named after which English physicist, a brewer's son?

A) Michael Faraday

B) William Thomson

C) Robert Hooke

D) James Prescott Joule

Answer · why

D) James Prescott Joule

He lived from 1818 to 1889 and was the son of a wealthy Salford brewer.

Q 03/05

How many joules is one thermochemical calorie now defined to equal?

A) 1.000

B) 9.807

C) 4.184

D) 1,055

Answer · why

C) 4.184

The 'large' calorie on food labels is a kilocalorie, 4,184 J.

Q 04/05

Who first introduced the calorie as a unit of heat energy, in lectures in 1819–1824?

A) Antoine Lavoisier

B) Sadi Carnot

C) Joseph Black

D) Nicolas Clément

Answer · why

D) Nicolas Clément

The lectures were on experimental calorimetry.

Q 05/05

How many joules raise the temperature of 1 kg of water by 1 K?

A) 418

B) 1,000

C) 4,184

D) 2,090

Answer · why

C) 4,184

Water has one of the highest specific heat capacities of any common substance.