Airdrops are simply waste of time so do not bother filling the forms.
80 percent Airdrop are Fakes and those which are genuine they wont pay you more than 1 dollar. It is better to stay away from Airdrops.
If you want to earn some free tokens/coin Join a Good Bounty program. The payment is still better than Airdrops.
Remember Before Joining a Bounty programme do your research about the ICO as scam ICO's are quiet common in Cryptoworld.