Electricity & Magnetism MCQs with Answers

Current passes through a P-N junction when it is

• A.Forward biased
• B.Reverse biased
• C.Unbiased
• D.None of these

The peak value of alternating current is √2 A. The mean square value of current will be

• A.√2 A²
• B.2 A²
• C.1 A²
• D.0.5 A²

As the value of AWG increases, the thickness of wire:

• A.Remains the same
• B.Increases
• C.Decreases
• D.First increases then decreases

100W bulb is operated by 200V, the current flowing through bulb is ?

• A.2 A
• B.0.5 A
• C.1 A
• D.5 A

An inverter converts ?

• A.AC to DC
• B.Low voltage to high voltage
• C.High voltage to low voltage
• D.DC to AC

Which of the following is/are conservative fields?

• A.Gravitational field
• B.Electrostatic field
• C.Both gravitational and electrostatic fields
• D.Magnetic field only

An electron is moving along the axis of a solenoid carrying a current. Which of the following is a correct statement about the electromagnetic force acting on the electron?

• A.A force acts perpendicular to the axis
• B.A force acts parallel to the axis
• C.No force acts
• D.A force acts opposite to the direction of current

Which of the following is a good insulator?

• A.Copper
• B.Iron
• C.Glass
• D.Aluminium

What are the directions of a magnetic bar?

• A.East and West
• B.North and South
• C.Up and Down
• D.Left and Right

Which of the following is NOT a conductor?

• A.Copper
• B.Silver
• C.Glass
• D.Iron