Broadcaster Alan Jones has denied being "careless with the truth" during a heated exchange at his defamation trial.

The talkback radio host was in the witness box at the Brisbane Supreme Court for a second day on Friday as his cross-examination continued.

Radio host Alan Jones is seen arriving at the Supreme Court in Brisbane. Credit:AAP

The prominent Queensland Wagner brothers are suing Jones, Harbour Radio, 4BC and writer Nick Cater for $4.8 million over 32 broadcasts between 2014 and 2015.

John, Denis, Neill and Joe Wagner claim they were accused of the deaths of 12 people in the town of Grantham during the 2011 floods when one of the walls of a quarry they owned collapsed.