"underway" only if she is NOT at anchor or made fast to the shore

"underway" only if she is moving through the water

"underway" only if she is NOT made fast to the shore

none of the choices is correct

180.0deg.

135.0deg.

112.5deg.

157.5deg.

A whistle only

A bell and a whistle

Any means of making an efficient sound signal

A bell only

A black cylinder having a diameter of not less than 0.6 m and a height twice its diameter.

A black diamond having a diameter of not less than 0.6 m and a height twice its diameter.

A black cylinder having a diameter of not less than 0.5 m and a height twice its diameter.

A black cylinder having a diameter of not less than 0.6 m and a height equal to its diameter.

A black cylinder having a diameter of not less than 0.5 m and a height twice its diameter.

A black cylinder having a diameter of not less than 0.6 m and a height equal to its diameter.

A black cylinder having a diameter of not less than 0.6 m and a height twice its diameter.

A black diamond having a diameter of not less than 0.6 m and a height twice its diameter.

a power driven vessel not towing

a power driven vessel and a vessel being towed

a power driven vessel towing

a barge being pushed ahead

supplemented by speed change

a large change

any of the choices is correct

a succession of small changes

A vessel

In trouble and not specifically addressed by the navigation rules

A special purpose vessel

A seaplane