What are the alarm concentration for gas detectors? CO$2$ & H$2$S

A$.$ Co$2-5000$ ppm & H$2$S $-10$ ppm

B$.$ Co$2-10000$ ppm & H$2$S $-50$ ppm

C$.$ Co$2-10000$ ppm & H$2$S $-40$ ppm

D$.$ Co$2-10000$ ppm & H$2$S $-70$ ppm

During maneuvering alongside sea with two ships under power, $\_\_\_\_\_\_\_$ vessel maintains the steerage way at slow speed.

A$.$ either of the

B$.$ the smaller

C$.$ None of the given options

D$.$ none of the vessel

The bunkering operations on board are carried out under whoes supervision?

A$.$ A responsible person

B$.$ The master

C$.$ The $2$nd engineer

D$.$ The Chief Engineer

What do you know about conditions necessary for absolute stability of air?

A$.$ Cannot specify as varies under many other circumstances

B$.$ None of the given options

C$.$ Actual lapse rate is more than salr

D$.$ Actual lapse rate is between dalr and salr

Choose the IHO ECDIS technical standard for Data Producer Codes.

A$.$ S$-57$

B$.$ S$-62$

C$.$ None of the given options

D$.$ S$-52$