The statement below is followed by four options. Each option is related to the item in the statement, but only one is always true. Select the option that always holds and makes the statement true.
"An aeroplane always has ______."
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Wings
The answer must hold for every aeroplane, without exception. An option that is present in most cases but can be missing in even one case is not always true.
Option (1) Jet engines — many aeroplanes are driven by propellers, not jet engines.
Option (2) Two decks — most aeroplanes have a single deck.
Option (3) Passengers — cargo planes carry goods, not passengers.
Option (4) Wings — an aeroplane is a powered aircraft that is held up in the air by its fixed wings; a flying machine without wings, such as a helicopter, is not an aeroplane, so this is always true.