Which of the following sentences contains a noun clause?

The correct answer is Option (4) → Nobody in the family remembered where Grandpa had put the land papers.

Noun clause as the object:

• A noun clause does the work of a noun. It can be the object of a verb.
• Here “where Grandpa had put the land papers” answers “remembered what?”. It is the object of “remembered”, so it is a noun clause.

Why the Other Options are Incorrect?

Option 1: This is the shop where my grandfather bought his first radio. — Incorrect. “Where my grandfather bought his first radio” describes the noun “shop”. It is an adjective clause. Example: The hostel where my brother stays is near the lake.

Option 2: The lights went off when the guests were cutting the cake. — Incorrect. “When the guests were cutting the cake” tells when the lights went off. It is an adverb clause of time. Example: We clapped when the singer finished.

Option 3: Everyone waited at the gate for the arrival of the chief guest. — Incorrect. “For the arrival of the chief guest” has no subject and verb of its own. It is a phrase, not a clause. Example: We met near the old temple.