Electricity & Magnetism MCQs with Answers

The relationship between voltage, current, and resistance is described in terms of _?

• A.Ohm's law
• B.Faraday's law
• C.Coulomb's law
• D.Joule's law

The circuit that provides two or more paths for the current is called?

• A.Series circuit
• B.Parallel circuit
• C.Open circuit
• D.Closed circuit

Alternating voltage and alternating current have a phase difference of 90° with each other in a circuit containing which component?

• A.Pure resistor only
• B.Pure inductor only
• C.Pure capacitor only
• D.Both pure inductor and pure capacitor

The magnetic flux through a loop of area 1 m² in a 0.5 T magnetic field is the same as the magnetic flux through a loop of area 0.5 m² in a magnetic field of ?

• A.1.0 T at 0°
• B.0.5 T at 90°
• C.2.0 T at 0°
• D.0.25 T at 0°

When the length of a copper wire is doubled, its resistivity becomes ?

• A.Doubled
• B.Halved
• C.Remains same
• D.Four times

An increase in temperature causes in conductance.

• A.No change
• B.Decrease
• C.Increase
• D.First increase then decrease

What is the SI unit of impedance?

• A.Farad
• B.Henry
• C.Ohm
• D.Tesla

In a transistor, what controls the current flowing between two electrodes?

• A.The voltage or current applied to specified electrodes
• B.The magnetic field surrounding the transistor
• C.The temperature of the semiconductor material
• D.The ambient light falling on the transistor

A particle A has a charge +q and particle B has a charge +4q with each of them having the same mass m. When allowed to fall from rest through the same electrical potential difference, the ratio of their speed VA : VB will become _?

• A.2:1
• B.1:2
• C.1:4
• D.4:1

What happens when two opposite poles of magnets are brought close to each other?

• A.They attract each other
• B.They repel each other
• C.They produce electric current
• D.No effect is observed