"What is the effect?"

Translation: Jaki jest efekt?

[Witek_Antoni]

Should be "jaki jest efekt"

[Vengir]

This is the default answer. What was yours?

[Tom873317]

With "put the right words in the right order", it ended up being "Co to efekt". Is that not right?

[Vengir]

It's also a valid translation, just with another meaning. In „Co to efekt?” you are asking somebody to define the word "effect" for you.

[Mark_B420]

For the multiple-choice questions, you also have to recognize "skutek", which is not yet introduced, I believe.

[Jellei]

Deleted from the best answers.

[Julia604611]

Any reason why we should choose jaki instead of co?

[Jellei]

"Co jest efektem?" also makes sense, added.

"Jaki jest efekt?" makes more sense to me. Usually when the English question has "what" and some noun, the Polish question uses a form of "jaki". But sometimes both make sense and I'm afraid I am still unable to figure out the rule behind it.

[Shmeh88]

Co to za efekt

[Jellei]

That means "What (kind of) effect is that?".