Electricity & Magnetism MCQs with Answers

If the angle between the vector area and the electric field is 30°, then the flux will be maximum when the angle becomes?

• A.0°
• B.30°
• C.90°
• D.60°

What are the two main types of transformers based on voltage change?

• A.Step-up and step-down
• B.AC and DC
• C.Series and parallel
• D.Core and shell

Flow of electrons is called ?

• A.Electric Current
• B.Electric Potential
• C.Electric Resistance
• D.Electric Power

In a gasoline vehicle, _ tends to prevent an arc at the contacts.

• A.Inductor
• B.Resistor
• C.Capacitor
• D.Transformer

A diode characteristic curve is a plot between ?

• A.Voltage and current
• B.Voltage and resistance
• C.Current and resistance
• D.Power and voltage

Which of the following quantities is a scalar?

• A.Velocity
• B.Electrostatic potential
• C.Force
• D.Acceleration

The hindrance to the flow of current is called?

• A.Capacitance
• B.Conductance
• C.Resistance
• D.Inductance

What is the formula for Ohm's Law?

• A.V = I × R
• B.V = R ÷ I
• C.I = V × R
• D.R = I ÷ V

Two point charges of +5 C and -12 C attract each other with a force of 1.48 N. A charge of -5 C is added to each of these charges. Now the force between them will be ?

• A.1.48 N (attractive)
• B.0.74 N (repulsive)
• C.Zero
• D.2.96 N (attractive)

Which one of the following principles of physics is applied in the extraction of smoke and dust particles from gases in smokestacks?

• A.Thermal expansion
• B.Electromagnetic induction
• C.Centrifugal force
• D.Static electricity