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. [ Voice coil, permanent magnet, slip rings, diaphragm ]

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. [ Nuclear energy, Thermal energy, Kinetic energy, Electrical energy]

Find the odd one in the group. More scattered reflection , virtual image, direct image , large image.