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In D'Ooge's book ( pg37 ) there is the exercise to translate:

Why does Galba's daughter give arms and weapons to the wicked farmers?

The translation is given as :

Cur filia Galbae agricolae malo arma et tela dat?

and I wrote:

Cur filia galbae argiolae malo armum et tellum dat?

I understood arms and weapons to be the dircet object and both are nuter, yet here they're in some other form? Or am I really messed up? Thanks for the help.

arma and tela are the PLURAL accusative forms;
arma only appears in the plural (as also in English "arms," when speaking of weapons, not anatomy);
telum can be singular: telum OR plural: tela (as also in English: weapon, singular, OR weapons, plural)