Questions

Computer memory - ROM is essentially empty. ROM is a Read Only Memory which cannot be retrieve.

In the given options, "His stomach rumbled like an approaching train" is an example of Simile.

All the other options are examples of metaphors. 

Simile and Metaphor are both figure of speeches in English which are used for comparing things but the only difference is Simile uses LIKE or AS words in comparing and metaphor directly compares without using any words.

Pushkalavati was capital of ancient Kingdom of Gandhara. Its ruins are currently located in Charsadda, Pakistan, located in Peshawar valley in the Khyber Pakhtunkhwa province (formerly NWFP). Pushkalavati was home of the Sanskrit grammarian Panini.