Electric field inside a conductor is always zero. Is this statement true of false?

The electric field inside a conductor

When a body rolls, on a stationary ground, the acceleration of the point of contact is always zero. Is this statement true or false?

Electric field itensity within a conductor is always zero. Why?

Why electrostatic field inside a conductor is zero,

The electric field inside a hollow charged conductor is zero. Is this true or false ?

The electric field inside a hollow charged conductor is zero. Is this true or false ?

Work done by friction in pure rolling is always zero. Is this statement true or false?

Work done by friction in pure rolling is always zero. Is this statement true or false?

Net charge within an imaginary cube drawn in a uniform electric field is always zero. Is this statement true or false?

Net charge within an imaginary cube drawn in a uniform electric field is always zero. Is this statement true or false?