Задание 1.3 срочно плиззззззз

1) сказуемое (predicate) - are based on (Present Simple Passive)
2) a) What is based on specific properties of electricity?
b) Are other devices based on specific properties of electricity?
c) What are other devices based on?  

1are based-present simple passive
2.à)what is based on specific properties of electricity?
b)Are other devices based on specific properties of electricity?
c)What are other devices based on?