Which signs should be interchanged to make the given equation correct.

45 × 5 + 60 ÷ 12 - 25 = 165

Select the most appropriate antonym of the given word.

SPARSE

The science of colours.

The two parties signed a lengthy _________.

It took a lot of time in making both of them come to a comfortable mutual ___________.

Deadlock 

Exhilarate

Perpetual

Select the most appropriate word for the given group of words. 

A slowly moving mass or river of ice

A lady who remains unmarried 

Select the most appropriate meaning of the given idiom. "Go down like a lead balloon"

In the following questions, out of the four alternatives, choose the one which best expresses the meaning of the given word as your answer.