The correct passive form of `Who baked the cake?` is-
Who the cake was baked?
By whom has the cake been baked?
By who was the cake baked?
By whom was the cake baked?
Explanation:
Correct Answer is: By whom was the cake baked?

Who the cake was baked?
By whom has the cake been baked?
By who was the cake baked?
By whom was the cake baked?
Correct Answer is: By whom was the cake baked?

Mr. Qureshi is a university Professor. Here `university` is a- Option A: Noun , Option B: Determiner , Option C: Noun adjective, Option D: Pronominal adjective, correct answer is: Noun adjective
Go and catch the falling star. Here the “falling” is- Option A: an adverb , Option B: a preposition , Option C: an adjective, Option D: a verb, correct answer is: an adjective
Let the task ___ done as directed. Option A: is , Option B: to be , Option C: was, Option D: be, correct answer is: be
There has been a breakthrough in the treatment of dengue. Here `breakthrough` is a/an: Option A: adjective , Option B: verb , Option C: noun, Option D: adverb, correct answer is: noun
I prefer tea - milk. Option A: than , Option B: then , Option C: to, Option D: more, correct answer is: to