Electricity Class 8

Silicon is a

• Conductor

• Insulator

• Semi conductor

• Superconductor

The SI unit of electric current is

• Coulomb

• Ampere

• Volt

• Ohm

An electrolyte is a

• a light electric cell

• a liquid that conducts electricity

• a metal

• none of these

electric bell works on the principle of

• chemical effect of current

• magnetic effect of current

• heating effect of current

• all of the above

To glow the LED by lemon we use ____________ and_______________

• Wood and copper

• copper and zinc

• zinc and rubber

• copper and zinc (covered with glass)

Good conductors have many loosely bound

• Molecules

• atoms

• protons

• electrons

which of the following is an example of non electrolyte

• NaOH

• HCL

• CuSO4

• CCl4

Which of the cannot be easily charged by friction

• a plastic scale

• a woolen cloth

• an inflated baloon

• a copper rod