Electricity & Magnetism MCQs with Answers

Why are transformers used in the transmission of electric power?

• A.Because they store electrical energy
• B.Because they convert AC to DC
• C.Because they can reduce transmission losses
• D.Because they generate electric power

Which of the following is the purpose of connecting a battery in an electric circuit?

• A.To maintain constant potential difference across the conductor
• B.To increase the resistance of the circuit
• C.To store electric charge in the circuit
• D.To convert AC into DC current

The conversion of Alternating Current (AC) into Direct Current (DC) is carried out by ?

• A.Transformer
• B.Rectifier
• C.Inverter
• D.Oscillator

In an RLC series circuit at resonance, the voltage across R, L and C are 10 V, 30 V and 30 V respectively. What will be the applied voltage?

• A.10 V
• B.30 V
• C.70 V
• D.50 V

Current can easily pass through ?

• A.Plastic ruler
• B.Rubber band
• C.Wooden stick
• D.Steel paper clip

If input of a NOT gate is "1" then its output is _?

• A.0
• B.1
• C.2
• D.None of these

Past Paper MCQ

The function of transformer is _?

• A.To change voltage level
• B.To isolate circuits
• C.Both A and B
• D.To convert AC to DC

The current through a conductor between two points is directly proportional to the voltage across the two points, is known as?

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

Which of the following is considered a good conductor of electricity?

• A.Rubber
• B.Copper
• C.Glass
• D.Plastic

The induced current will flow in such a direction so as to oppose the cause that produces it. This is the statement of _?

• A.Faraday's Law
• B.Lenz's Law
• C.Ohm's Law
• D.Fleming's Right Hand Rule