Answer:
daleks are almost indestructible with strong dalekanium amour which protects them from bullets and energy weapons as seen in doomsday. Cybermens high energy particle beam's had no effect on the members of the cult of skaro (four daleks determined to find new ways of extermination). There are few weaknesses a dalek has but it can be destroyed by bastic-tipped bullets. But unfortunately if you did posses them they created an energy shield to protect themselves from the bullets unless the dalek is unprotected the bastic-tipped bullets wont work. Another weakness is the eye stalk even with the energy shield if you concentrate your fire on the eye stalk you might get lucky and destroy the eye stalk. this enables them to see and wont be able to shoot you. but don't think the eye stalk is very weak because paintball guns wont work.