Electricity & Magnetism MCQs with Answers

Minimum charge on any object cannot be less than ?

• A.1 × 10⁻¹⁹ C
• B.9.1 × 10⁻³¹ C
• C.1 × 10⁻¹⁹ e
• D.1.6 × 10⁻¹⁹ C

The reading in electric meter is in kilowatt-hours which is simply called a unit. The coil inside an electric meter is set into motion by which one of the following?

• A.The current producing a magnetic field
• B.The voltage creating an electrostatic force
• C.The resistance generating heat energy
• D.The frequency inducing a mechanical vibration

The SI unit of resistance is ohm, represented by the Greek letter omega (Ω). One ohm is equal to which of the following?

• A.1J / 1C
• B.1A / 1V
• C.1W / 1A
• D.1V / 1A

The SI unit of energy density of electric field is ?

• A.V/m
• B.W/m²
• C.N/C
• D.J/m³

Which of the following is NOT an example of an insulator?

• A.Rubber
• B.Glass
• C.Copper
• D.Wood

In an intrinsic semiconductor, how does the number of free electrons compare to the number of holes?

• A.Equals the number of holes
• B.Is greater than the number of holes
• C.Is less than the number of holes
• D.Is zero, while holes are abundant

What device is commonly used to turn an electrical circuit on and off?

• A.Fuse
• B.Switch
• C.Resistor
• D.Capacitor

Which type of material among the following is known for having the lowest permeability?

• A.Ferromagnetic material
• B.Paramagnetic material
• C.Diamagnetic material
• D.Ferrimagnetic material

Which one of the following will be a good conductor of electricity?

• A.Molten NaCl
• B.Solid NaCl
• C.Distilled water
• D.Sugar solution

Which of the following is not a correct example of a semiconductor?

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