The weak type of bonding which attracts molecules to molecules is: ionic hydrogen covalent nuclear

The correct answer is hydrogen.

Explanation:

The force that binds two molecules using a hydrogen bridge or hydrogen bond is the attractive electrostatic force between an electronegative atom and a hydrogen atom covalently attached to another electronegative atom. It is a weaker force than the covalent bond or ionic bond.

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c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.