An electric motor converts: MCQ with Answer and Explanation

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An electric motor converts:

A. Electrical energy into mechanical energy

B. Magnetic energy into electrical energy

C. Chemical energy into mechanical energy

D. Mechanical energy into electrical energy

Answer: Option A

Solution (By JKSSB Mock Tests)

An electric motor is a device that utilizes the magnetic effect of electric current. When a current-carrying coil is placed in a magnetic field, it experiences a force (Fleming's Left-Hand Rule) that causes it to rotate. Therefore, it continuously converts electrical energy into mechanical energy. A generator does the reverse.

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Question #1

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The scientist who invented the electric generator is

A. Thomas Edison

B. Nikola Tesla

C. James Watt

D. Michael Faraday

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Correct Answer: Option D

Explanation:
Michael Faraday built the first electric generator (Faraday disk) in 1831, based on electromagnetic induction. Tesla contributed to AC motor and polyphase system. Edison DC systems. Watt steam engine.

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Question #2

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Atom's nucleus contains:

A. Only protons

B. Protons, neutrons, electrons

C. Electrons and protons

D. Protons and neutrons

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Correct Answer: Option D

Explanation:
Nucleus: protons (+) and neutrons (neutral); electrons orbit outside. Atomic number = proton count; mass number = protons + neutrons. Memory tip: 'Nucleus = nucleons (p+n); electrons in shells'. Basic atomic structure frequently tested in competitive modern physics sections.

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Question #3

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LCR resonance condition:

A. f = 0

B. Z maximum

C. X_L = X_C

D. R = 0

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Correct Answer: Option C

Explanation:
Resonance: ωL = 1/(ωC) ⇒ ω = 1/√(LC). At this frequency, impedance minimum (Z=R), current maximum. Memory tip: 'Resonance: X_L = X_C; series: Z_min, current max'. AC circuit concept frequently tested in competitive exams.

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