Electricity & Magnetism MCQs with Answers

The formula Φ = B.A represents ?

• A.Magnetic flux
• B.Electric flux
• C.Magnetic field intensity
• D.Electromotive force

The step-up transformer ?

• A.Converts AC to DC
• B.Decreases the input voltage
• C.Keeps the voltage unchanged
• D.Increases the input voltage

What is the unit of measurement of Inductance?

• A.Henry
• B.Farad
• C.Tesla
• D.Weber

What is the unit of electrical resistance?

• A.Volt
• B.Ampere
• C.Ohm
• D.Watt

Two identical capacitors, each with capacitance C, are connected in parallel and the combination is connected in series to a third identical capacitor. The equivalent capacitance of this arrangement is _?

• A.3C/2
• B.C/3
• C.3C
• D.2C/3

In a series circuit, the net resistance is?

• A.The sum of all resistances
• B.The reciprocal of the sum of reciprocals of all resistances
• C.Equal to the smallest resistance
• D.Half of the largest resistance

Electronics comprises the _?

• A.study of electron flow in vacuum tubes only
• B.study of electron flow in semiconductors only
• C.study of electron flow in conductors only
• D.All of these

A positive charge moving with a constant velocity v enters a region of a uniform magnetic field pointing out of the page. What is the direction of the magnetic force on the charge?

• A.To the top of the page
• B.To the bottom of the page
• C.Into the page
• D.Out of the page

Transistors in a circuit basically act as:

• A.Voltage regulators
• B.Current amplifiers
• C.Power rectifiers
• D.Frequency modulators

Past Paper MCQ

Laws of magnetic induction were given by _?

• A.Ohm
• B.Newton
• C.Maxwell
• D.Faraday