Electricity & Magnetism MCQs with Answers

Solid-state detector is basically _?

• A.Thermocouple
• B.Vacuum tube
• C.Electromagnet
• D.PN junction

The electrode potential of the standard hydrogen electrode is chosen as

• A.-1 V
• B.1 V
• C.0 V
• D.0.5 V

N-type material consists of?

• A.Holes
• B.Neutrons
• C.Protons
• D.Electrons

Why might the full life cycle cost of copper cable be lower than that of aluminum cable?

• A.Copper has lower electrical conductivity
• B.Copper is cheaper to purchase initially
• C.Copper is lighter and easier to transport
• D.Copper is more durable and reliable over time

Lenz's law is an example of the principle of conservation of:

• A.Energy
• B.Momentum
• C.Charge
• D.Mass

Which of the following is not a semiconductor material?

• A.Silicon
• B.Germanium
• C.Paper
• D.Gallium Arsenide

P-type material consists of ?

• A.pure germanium crystals
• B.silicon doped with phosphorus
• C.silicon doped with boron
• D.intrinsic 3D crystals of silicon

If mass of a charged particle is doubled, what happens to its cyclotron frequency?

• A.Doubles
• B.Halves
• C.Remains unchanged
• D.Becomes four times

The energy gap (in eV) between the valence and conduction bands of an insulator is of the order of ?

• A.0.1
• B.1
• C.5
• D.0.01

In a vacuum or free space, what observations are made?

• A.p = 0, J = 0
• B.p ≠ 0, J = 0
• C.p = 0, J ≠ 0
• D.p ≠ 0, J ≠ 0