Meaning of 'pie in the sky'

[Sharada]

Test No. incompl/advan-49 "Up in the Clouds", question 4

I simply don't believe the scheme will ever succeed, it's just ......... in the sky.

(a) meat
(b) pie
(c) food
(d) meals

Test No. incompl/advan-49 "Up in the Clouds", answer 4

I simply don't believe the scheme will ever succeed, it's just pie in the sky.

Correct answer: (b) pie

Your answer was: correct
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what is the meaning of this question.

[Alan]

This means something that is impossible to realise - a dream - a daydream.
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English as a Second Language
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[Lost_Soul]

It goes without the article "a" ??? (i.e. a pie in the sky) ???

[Yankee]

.
That's right, lost_soul.
The expression pie in the sky is not used with an article.

Amy
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"Nearly all men can stand adversity, but if you want to test a man's character, give him power." ~ Abraham Lincoln