Select the most appropriate meaning of the given

Identify the erroneous part of the sentence.

The manager asked / whether had the employees / submitted the files / before the deadline. 

Did you knew that the radio is ranked number two in the list of ‘101’ Gadgets that changed the World’s according to History Channel?

Except for coastal peninsular areas, (A)/almost all of the India (B)/received deficit rainfall in March (C).

I and you must meet often to be updated about each other.

An unsecured loan (1)/ is a loan (2)/ which one could obtain (3)/ without providing any collateral (4)/ No error (5)

Can India make it to a leadership position (1)/ or will it be retained the ‘fast train-going-slow’ (2)/ image it always had? (3)/ No error (4)

He insisted that the report (1)/ should be submitted by the (2)/ end of the week to ensure (3)/ that there are no further delays (4)/ no error (5)

In the sentence, identify the segment which contains the grammatical error.

They had been dancing / for an hour / when our dance teacher / had arrived.