were any modifications made to the ship?
Yes, both anti-aircraft guns were replaced by a pair of QF 4-inch Mark V guns.
HMAS Australia (1911)

After the war, both anti-aircraft guns were replaced by a pair of QF 4-inch Mark V guns on manually operated high-angle mounts in January 1920. Their elevation limits were −5° to 80°. The guns fired a shell at a muzzle velocity of at a rate of fire of 10–15 rounds per minute. They had a maximum effective ceiling of .
what is hmas australia 1911? It was one of three s built for the defence of the British Empire. when was it built? 1911. who was it built by? UNANSWERABLE who is responsible for the design of the ship? UNANSWERABLE
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HMAS Australia (1911) [SEP] Modifications
"Australia" was also fitted with an additional inch of armour around the midships turrets following the Battle of Jutland. By 1918, "Australia" carried a Sopwith Pup and a Sopwith 1½ Strutter on platforms fitted to the top of 'P' and 'Q' turrets. The first flying off by a 1½ Strutter was from "Australia"s 'Q' turret on 4 April 1918. Each platform had a canvas hangar to protect the aircraft during inclement weather. At the end of World War I, "Australia" was described as "the least obsolescent of her class". After the war, both anti-aircraft guns were replaced by a pair of QF 4-inch Mark V guns on manually operated high-angle mounts in January 1920.