Correct!

When should you use the engine cut-out switch?

To stop the engine in an emergency
Correct answer
To stop the engine after a short journey
To save wear on the ignition switch
To start the engine if you lose the key

DVSA theory test explanation

Most motorcycles are fitted with an engine cut-out switch. This is designed to stop the engine in an emergency and so reduce the risk of electrical sparks starting a fire.