Electricity & Magnetism MCQs with Answers

Which device is used to decrease voltage?

• A.Step-up transformer
• B.Amplifier
• C.Rectifier
• D.Step-down transformer

For an electromagnetic wave, the direction of the vector E × B gives _?

• A.The direction of the electric field
• B.The direction of the magnetic field
• C.The direction of the wave propagation
• D.The direction opposite to wave propagation

The current flowing through a conductor depends on which of the following?

• A.Resistance of the conductor
• B.Potential difference across the conductor
• C.Temperature of the conductor
• D.All of these

The material which is slightly attracted to a magnetic field is _?

• A.Ferromagnetic
• B.Paramagnetic
• C.Diamagnetic
• D.Non-magnetic

The capacitance between two parallel charged sheets is dependent upon?

• A.Surface area only
• B.Distance between the plates only
• C.Both surface area and distance between the plates
• D.Neither surface area nor distance between the plates

When a magnetic compass is placed on the ground, its needle will stay along _?

• A.South-West direction
• B.East-West direction
• C.North-East direction
• D.North-South direction

A child rubbed two balloons with a piece of wool. Which of the following happens when the balloons are brought near each other?

• A.They attract each other
• B.They stick to each other permanently
• C.They repel each other
• D.No effect is observed

If the area of the parallel plate capacitor is doubled then the capacitance will be _?

• A.Double
• B.Half
• C.Remain same
• D.One-fourth

Magnetic lines of force always form _?

• A.Open curves
• B.Broken segments
• C.Straight lines
• D.Closed loops

A device used to measure potential difference is called ?

• A.Ammeter
• B.Voltmeter
• C.Galvanometer
• D.Ohmmeter