Motors & Generators — Homi Bhabha Exam Physics MCQs with Solutions
Free Homi Bhabha Exam Physics Motors & Generators MCQs with step-by-step solutions (3 questions). Part of Electricity & Magnetism. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Motors & Generators · medium · theory
An electric motor converts:
A. electrical energy into mechanical energy ✓ Correct
B. electrical energy into chemical energy
C. mechanical energy into electrical energy
D. heat into electrical energy
Solution: A motor uses the force on a current-carrying coil in a magnetic field to produce rotation (mechanical energy).
Q2 — Motors & Generators · medium · theory
An electric generator (dynamo) converts:
A. chemical energy into heat
B. light into electricity
C. electrical energy into mechanical energy
D. mechanical energy into electrical energy ✓ Correct
Solution: A generator rotates a coil in a magnetic field to induce a current — mechanical to electrical energy.
Q3 — Motors & Generators · hard · theory
The working of an electric generator is based on the principle of:
A. conservation of charge
B. electromagnetic induction ✓ Correct
C. Ohm's law
D. the heating effect of current
Solution: A changing magnetic flux through the coil induces an EMF — electromagnetic induction (Faraday's law).