Is investment considered as current asset?

Yes... technically it would be a Current Asset.

Firstly Current Assets in a balance sheet are technically "Assets that will provide a future economic benefit" to the company within a period of one financial period (a financial year in Australia -...

yes

most of the time they are. a current asset is an asset that is expected to be expensed or turned in cash within one year or the current operating cycle, whichever is longer

If less than a year to maturity then current assest, more than a year long term asset.