Query Detail : SEBI Grade A Officer Phase I Paper 1

The second system comprises of the instruments used to exercise the rules and regulations. Serpentine queues of vehicles could be seen moving slowly over highways due to the dense fog. Kindly explain the reason of errors in above sentences.
Himanshi,   May 2nd 2020,  
SEBI Grade A Officer Phase I Paper 1


Hi Himanshi,

The second system comprises of the instruments used to exercise the rules and regulations.

The second system comprises of the instruments used to exercise the rules and regulations.

We always use "consists of" and only "comprises". "Comprises" itself means "consists of".

Serpentine queues of vehicles could be seen moving slowly over highways due to the dense fog.

This depends on context but usually we say "a serpentine queue of vehicles" and not "serpentine queues". Also, we need to use "on highways" and not "over highways". We use "over" when there is no contact. (Example - The plane flew over the lake).