Find the odd one in the group and write the reason . [Coal gas , Coal tar , Butane , Coke]

Find the odd one in the group and write the reason. [ Voice coil , field magnet , slip rings , armature ].

Find the odd one in the group and write the reason. [ Nuclear energy, Thermal energy, Kinetic energy, Electrical energy]

Find the odd one in the group and write the reason. [ Voice coil, permanent magnet, slip rings, diaphragm ]

Find out the odd one from the following also write the reason. [long glass tube , Mercury vapour, Fluorescent coating , Thin tungsten filament ]