Electricity & Magnetism MCQs with Answers

A point charge of 10 × 10⁻⁶ C is at the centre of a cubical Gaussian surface of sides 0.5 m. What is the flux for the surface?

• A.2.24 × 10⁵ Nm²/C
• B.1.12 × 10⁶ Nm²/C
• C.1.12 × 10⁵ Nm²/C
• D.5.60 × 10⁴ Nm²/C

The electricity we use in our homes and schools is called?

• A.Direct Current (DC)
• B.Alternating Current (AC)
• C.Static Electricity
• D.Eddy Current

Power is the product of?

• A.Voltage and Current
• B.Voltage and Resistance
• C.Current and Resistance
• D.Force and Distance

Past Paper MCQ

The functioning of a loudspeaker depends upon its _?

• A.Chemical effect of current
• B.Heating effect of current
• C.Magnetic effect of current
• D.Electrostatic effect of current

The conversion of A.C into D.C is called rectification and the circuit is called a rectifier. Which component of electronics acts as a rectifier?

• A.Transistor
• B.Capacitor
• C.Diode
• D.Resistor

A constant current is sent through a helical coil. The coil ?

• A.Tends to get shorter
• B.Tends to get longer
• C.Tends to rotate
• D.Remains unchanged

Resistance of a conductor does not depend on _?

• A.Length
• B.Cross-sectional area
• C.Density
• D.Temperature

When a high resistance is connected in series with the galvanometer coil, it is converted into ?

• A.Ammeter
• B.Voltmeter
• C.Ohmmeter
• D.Wattmeter

The basic circuit element in a DC circuit is:

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

Which of the following is the main difference between electromagnets and bar magnets?

• A.Electromagnets need electricity but bar magnets do not need electricity
• B.Electromagnets are permanent but bar magnets are temporary
• C.Bar magnets need electricity but electromagnets do not need electricity
• D.Both types of magnets require electricity to function