One hundred and thirty confused VCE history students had their scores adjusted after an artwork featuring a mysterious robot who appeared to be assisting socialist revolutionaries in 1917 was accidentally used in last year's exam.

The VCE exam body apologised after the doctored version of Storming of the Winter Palace by Nikolai Kochergin formed part of a question about the Russian Revolution in the History: Revolutions exam.

The altered image had been sourced from the internet.

While many students did not notice a giant robot - rather like BattleTech Marauder II – in the background of the artwork, others were distracted by the strange image, suggesting it was anything from a statue of prime minister Alexander Kerensky, who was supported by the Mensheviks, to the battleship Aurora.