Which is not a protection against electrical accidents?

grounded plug

fuse

insulation

conducting wire

conducting wires

Explanation:

Grounded plug provides the earthing to the device. It is the safety device to the user.  

Fuse wire is the safety device for the electrical appliance.

Insulation is the layer of non conducting material on the connecting wires or the conductor, which is also a safety precaution.

Conducting wires are the wire which can conduct the electricity, so they are not the protections against electrical accidents.

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.