Electricity & Magnetism MCQs with Answers

If the dielectric material between the plates of the capacitor is removed, what happens to the electric field between the plates?

• A.The electric field remains the same
• B.The electric field decreases
• C.The electric field increases
• D.The electric field becomes zero

Which of the following is not a semiconductor but an insulator?

• A.Silicon
• B.Germanium
• C.Marble
• D.Gallium arsenide

The magnetic force Fm acting on charge q when moves with a velocity v through a magnetic field B is given by ?

• A.Fm = q(v · B)
• B.Fm = q v × B
• C.Fm = q B × v
• D.Fm = q(v + B)

Which one of the following is not a conductor?

• A.Silver
• B.Copper
• C.Graphite
• D.All of these

When magnetic field and area vector are perpendicular then magnetic flux will be ?

• A.Maximum
• B.Zero
• C.Minimum but not zero
• D.Infinite

Which motor has an unsymmetrical rotor?

• A.Induction Motor
• B.Synchronous Motor
• C.Reluctance Motor
• D.DC Series Motor

In case of electric shock, the patient should be placed on:

• A.Dry Floor
• B.Wet Floor
• C.Metal Surface
• D.None of these

Which one of the following is an insulator material?

• A.Copper
• B.Porcelain
• C.Aluminium
• D.Graphite

The most efficient engine is _?

• A.Electric engine
• B.Diesel engine
• C.Petrol engine
• D.Steam engine

Regarding batteries, all of the following statements are incorrect except that?

• A.Primary cells are rechargeable
• B.Secondary cells are non-rechargeable
• C.Both primary and secondary cells are rechargeable
• D.Primary cells have a reversible chemical reaction